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1467 lines
56 KiB
1467 lines
56 KiB
/*
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* Copyright (c) 2003, 2016, Oracle and/or its affiliates. All rights reserved.
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* ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*/
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package java.lang;
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import sun.misc.FloatingDecimal;
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import java.util.Arrays;
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/**
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* A mutable sequence of characters.
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* <p>
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* Implements a modifiable string. At any point in time it contains some
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* particular sequence of characters, but the length and content of the
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* sequence can be changed through certain method calls.
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*
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* <p>Unless otherwise noted, passing a {@code null} argument to a constructor
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* or method in this class will cause a {@link NullPointerException} to be
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* thrown.
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*
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* @author Michael McCloskey
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* @author Martin Buchholz
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* @author Ulf Zibis
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* @since 1.5
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*/
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abstract class AbstractStringBuilder implements Appendable, CharSequence {
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/**
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* The value is used for character storage.
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*/
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char[] value;
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/**
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* The count is the number of characters used.
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*/
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int count;
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/**
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* This no-arg constructor is necessary for serialization of subclasses.
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*/
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AbstractStringBuilder() {
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}
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/**
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* Creates an AbstractStringBuilder of the specified capacity.
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*/
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AbstractStringBuilder(int capacity) {
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value = new char[capacity];
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}
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/**
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* Returns the length (character count).
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*
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* @return the length of the sequence of characters currently
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* represented by this object
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*/
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@Override
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public int length() {
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return count;
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}
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/**
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* Returns the current capacity. The capacity is the amount of storage
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* available for newly inserted characters, beyond which an allocation
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* will occur.
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*
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* @return the current capacity
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*/
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public int capacity() {
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return value.length;
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}
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/**
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* Ensures that the capacity is at least equal to the specified minimum.
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* If the current capacity is less than the argument, then a new internal
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* array is allocated with greater capacity. The new capacity is the
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* larger of:
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* <ul>
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* <li>The {@code minimumCapacity} argument.
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* <li>Twice the old capacity, plus {@code 2}.
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* </ul>
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* If the {@code minimumCapacity} argument is nonpositive, this
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* method takes no action and simply returns.
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* Note that subsequent operations on this object can reduce the
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* actual capacity below that requested here.
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*
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* @param minimumCapacity the minimum desired capacity.
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*/
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public void ensureCapacity(int minimumCapacity) {
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if (minimumCapacity > 0)
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ensureCapacityInternal(minimumCapacity);
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}
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/**
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* For positive values of {@code minimumCapacity}, this method
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* behaves like {@code ensureCapacity}, however it is never
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* synchronized.
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* If {@code minimumCapacity} is non positive due to numeric
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* overflow, this method throws {@code OutOfMemoryError}.
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*/
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private void ensureCapacityInternal(int minimumCapacity) {
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// overflow-conscious code
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if (minimumCapacity - value.length > 0) {
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value = Arrays.copyOf(value,
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newCapacity(minimumCapacity));
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}
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}
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/**
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* The maximum size of array to allocate (unless necessary).
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* Some VMs reserve some header words in an array.
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* Attempts to allocate larger arrays may result in
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* OutOfMemoryError: Requested array size exceeds VM limit
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*/
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private static final int MAX_ARRAY_SIZE = Integer.MAX_VALUE - 8;
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/**
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* Returns a capacity at least as large as the given minimum capacity.
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* Returns the current capacity increased by the same amount + 2 if
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* that suffices.
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* Will not return a capacity greater than {@code MAX_ARRAY_SIZE}
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* unless the given minimum capacity is greater than that.
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*
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* @param minCapacity the desired minimum capacity
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* @throws OutOfMemoryError if minCapacity is less than zero or
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* greater than Integer.MAX_VALUE
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*/
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private int newCapacity(int minCapacity) {
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// overflow-conscious code
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int newCapacity = (value.length << 1) + 2;
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if (newCapacity - minCapacity < 0) {
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newCapacity = minCapacity;
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}
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return (newCapacity <= 0 || MAX_ARRAY_SIZE - newCapacity < 0)
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? hugeCapacity(minCapacity)
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: newCapacity;
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}
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private int hugeCapacity(int minCapacity) {
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if (Integer.MAX_VALUE - minCapacity < 0) { // overflow
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throw new OutOfMemoryError();
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}
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return (minCapacity > MAX_ARRAY_SIZE)
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? minCapacity : MAX_ARRAY_SIZE;
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}
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/**
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* Attempts to reduce storage used for the character sequence.
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* If the buffer is larger than necessary to hold its current sequence of
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* characters, then it may be resized to become more space efficient.
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* Calling this method may, but is not required to, affect the value
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* returned by a subsequent call to the {@link #capacity()} method.
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*/
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public void trimToSize() {
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if (count < value.length) {
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value = Arrays.copyOf(value, count);
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}
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}
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/**
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* Sets the length of the character sequence.
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* The sequence is changed to a new character sequence
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* whose length is specified by the argument. For every nonnegative
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* index <i>k</i> less than {@code newLength}, the character at
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* index <i>k</i> in the new character sequence is the same as the
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* character at index <i>k</i> in the old sequence if <i>k</i> is less
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* than the length of the old character sequence; otherwise, it is the
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* null character {@code '\u005Cu0000'}.
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*
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* In other words, if the {@code newLength} argument is less than
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* the current length, the length is changed to the specified length.
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* <p>
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* If the {@code newLength} argument is greater than or equal
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* to the current length, sufficient null characters
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* ({@code '\u005Cu0000'}) are appended so that
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* length becomes the {@code newLength} argument.
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* <p>
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* The {@code newLength} argument must be greater than or equal
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* to {@code 0}.
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*
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* @param newLength the new length
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* @throws IndexOutOfBoundsException if the
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* {@code newLength} argument is negative.
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*/
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public void setLength(int newLength) {
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if (newLength < 0)
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throw new StringIndexOutOfBoundsException(newLength);
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ensureCapacityInternal(newLength);
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if (count < newLength) {
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Arrays.fill(value, count, newLength, '\0');
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}
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count = newLength;
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}
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/**
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* Returns the {@code char} value in this sequence at the specified index.
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* The first {@code char} value is at index {@code 0}, the next at index
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* {@code 1}, and so on, as in array indexing.
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* <p>
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* The index argument must be greater than or equal to
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* {@code 0}, and less than the length of this sequence.
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*
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* <p>If the {@code char} value specified by the index is a
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* <a href="Character.html#unicode">surrogate</a>, the surrogate
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* value is returned.
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*
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* @param index the index of the desired {@code char} value.
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* @return the {@code char} value at the specified index.
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* @throws IndexOutOfBoundsException if {@code index} is
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* negative or greater than or equal to {@code length()}.
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*/
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@Override
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public char charAt(int index) {
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if ((index < 0) || (index >= count))
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throw new StringIndexOutOfBoundsException(index);
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return value[index];
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}
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/**
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* Returns the character (Unicode code point) at the specified
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* index. The index refers to {@code char} values
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* (Unicode code units) and ranges from {@code 0} to
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* {@link #length()}{@code - 1}.
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*
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* <p> If the {@code char} value specified at the given index
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* is in the high-surrogate range, the following index is less
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* than the length of this sequence, and the
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* {@code char} value at the following index is in the
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* low-surrogate range, then the supplementary code point
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* corresponding to this surrogate pair is returned. Otherwise,
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* the {@code char} value at the given index is returned.
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*
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* @param index the index to the {@code char} values
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* @return the code point value of the character at the
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* {@code index}
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* @exception IndexOutOfBoundsException if the {@code index}
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* argument is negative or not less than the length of this
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* sequence.
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*/
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public int codePointAt(int index) {
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if ((index < 0) || (index >= count)) {
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throw new StringIndexOutOfBoundsException(index);
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}
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return Character.codePointAtImpl(value, index, count);
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}
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/**
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* Returns the character (Unicode code point) before the specified
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* index. The index refers to {@code char} values
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* (Unicode code units) and ranges from {@code 1} to {@link
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* #length()}.
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*
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* <p> If the {@code char} value at {@code (index - 1)}
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* is in the low-surrogate range, {@code (index - 2)} is not
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* negative, and the {@code char} value at {@code (index -
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* 2)} is in the high-surrogate range, then the
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* supplementary code point value of the surrogate pair is
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* returned. If the {@code char} value at {@code index -
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* 1} is an unpaired low-surrogate or a high-surrogate, the
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* surrogate value is returned.
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*
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* @param index the index following the code point that should be returned
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* @return the Unicode code point value before the given index.
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* @exception IndexOutOfBoundsException if the {@code index}
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* argument is less than 1 or greater than the length
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* of this sequence.
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*/
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public int codePointBefore(int index) {
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int i = index - 1;
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if ((i < 0) || (i >= count)) {
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throw new StringIndexOutOfBoundsException(index);
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}
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return Character.codePointBeforeImpl(value, index, 0);
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}
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/**
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* Returns the number of Unicode code points in the specified text
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* range of this sequence. The text range begins at the specified
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* {@code beginIndex} and extends to the {@code char} at
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* index {@code endIndex - 1}. Thus the length (in
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* {@code char}s) of the text range is
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* {@code endIndex-beginIndex}. Unpaired surrogates within
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* this sequence count as one code point each.
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*
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* @param beginIndex the index to the first {@code char} of
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* the text range.
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* @param endIndex the index after the last {@code char} of
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* the text range.
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* @return the number of Unicode code points in the specified text
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* range
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* @exception IndexOutOfBoundsException if the
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* {@code beginIndex} is negative, or {@code endIndex}
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* is larger than the length of this sequence, or
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* {@code beginIndex} is larger than {@code endIndex}.
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*/
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public int codePointCount(int beginIndex, int endIndex) {
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if (beginIndex < 0 || endIndex > count || beginIndex > endIndex) {
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throw new IndexOutOfBoundsException();
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}
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return Character.codePointCountImpl(value, beginIndex, endIndex-beginIndex);
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}
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/**
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* Returns the index within this sequence that is offset from the
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* given {@code index} by {@code codePointOffset} code
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* points. Unpaired surrogates within the text range given by
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* {@code index} and {@code codePointOffset} count as
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* one code point each.
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*
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* @param index the index to be offset
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* @param codePointOffset the offset in code points
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* @return the index within this sequence
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* @exception IndexOutOfBoundsException if {@code index}
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* is negative or larger then the length of this sequence,
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* or if {@code codePointOffset} is positive and the subsequence
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* starting with {@code index} has fewer than
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* {@code codePointOffset} code points,
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* or if {@code codePointOffset} is negative and the subsequence
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* before {@code index} has fewer than the absolute value of
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* {@code codePointOffset} code points.
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*/
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public int offsetByCodePoints(int index, int codePointOffset) {
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if (index < 0 || index > count) {
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throw new IndexOutOfBoundsException();
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}
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return Character.offsetByCodePointsImpl(value, 0, count,
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index, codePointOffset);
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}
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/**
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* Characters are copied from this sequence into the
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* destination character array {@code dst}. The first character to
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* be copied is at index {@code srcBegin}; the last character to
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* be copied is at index {@code srcEnd-1}. The total number of
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* characters to be copied is {@code srcEnd-srcBegin}. The
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* characters are copied into the subarray of {@code dst} starting
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* at index {@code dstBegin} and ending at index:
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* <pre>{@code
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* dstbegin + (srcEnd-srcBegin) - 1
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* }</pre>
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*
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* @param srcBegin start copying at this offset.
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* @param srcEnd stop copying at this offset.
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* @param dst the array to copy the data into.
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* @param dstBegin offset into {@code dst}.
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* @throws IndexOutOfBoundsException if any of the following is true:
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* <ul>
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* <li>{@code srcBegin} is negative
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* <li>{@code dstBegin} is negative
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* <li>the {@code srcBegin} argument is greater than
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* the {@code srcEnd} argument.
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* <li>{@code srcEnd} is greater than
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* {@code this.length()}.
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* <li>{@code dstBegin+srcEnd-srcBegin} is greater than
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* {@code dst.length}
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* </ul>
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*/
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public void getChars(int srcBegin, int srcEnd, char[] dst, int dstBegin)
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{
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if (srcBegin < 0)
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throw new StringIndexOutOfBoundsException(srcBegin);
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if ((srcEnd < 0) || (srcEnd > count))
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throw new StringIndexOutOfBoundsException(srcEnd);
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if (srcBegin > srcEnd)
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throw new StringIndexOutOfBoundsException("srcBegin > srcEnd");
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System.arraycopy(value, srcBegin, dst, dstBegin, srcEnd - srcBegin);
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}
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/**
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* The character at the specified index is set to {@code ch}. This
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* sequence is altered to represent a new character sequence that is
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* identical to the old character sequence, except that it contains the
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* character {@code ch} at position {@code index}.
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* <p>
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* The index argument must be greater than or equal to
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* {@code 0}, and less than the length of this sequence.
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*
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* @param index the index of the character to modify.
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* @param ch the new character.
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* @throws IndexOutOfBoundsException if {@code index} is
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* negative or greater than or equal to {@code length()}.
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*/
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public void setCharAt(int index, char ch) {
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if ((index < 0) || (index >= count))
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throw new StringIndexOutOfBoundsException(index);
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value[index] = ch;
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}
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/**
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* Appends the string representation of the {@code Object} argument.
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* <p>
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* The overall effect is exactly as if the argument were converted
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* to a string by the method {@link String#valueOf(Object)},
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* and the characters of that string were then
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* {@link #append(String) appended} to this character sequence.
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*
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* @param obj an {@code Object}.
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* @return a reference to this object.
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*/
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public AbstractStringBuilder append(Object obj) {
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return append(String.valueOf(obj));
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}
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/**
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* Appends the specified string to this character sequence.
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* <p>
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* The characters of the {@code String} argument are appended, in
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* order, increasing the length of this sequence by the length of the
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* argument. If {@code str} is {@code null}, then the four
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* characters {@code "null"} are appended.
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* <p>
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* Let <i>n</i> be the length of this character sequence just prior to
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* execution of the {@code append} method. Then the character at
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* index <i>k</i> in the new character sequence is equal to the character
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* at index <i>k</i> in the old character sequence, if <i>k</i> is less
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* than <i>n</i>; otherwise, it is equal to the character at index
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* <i>k-n</i> in the argument {@code str}.
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*
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* @param str a string.
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* @return a reference to this object.
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*/
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public AbstractStringBuilder append(String str) {
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if (str == null)
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return appendNull();
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int len = str.length();
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ensureCapacityInternal(count + len);
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str.getChars(0, len, value, count);
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count += len;
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return this;
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}
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|
|
// Documentation in subclasses because of synchro difference
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public AbstractStringBuilder append(StringBuffer sb) {
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if (sb == null)
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return appendNull();
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int len = sb.length();
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ensureCapacityInternal(count + len);
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sb.getChars(0, len, value, count);
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count += len;
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return this;
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}
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|
|
|
/**
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* @since 1.8
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|
*/
|
|
AbstractStringBuilder append(AbstractStringBuilder asb) {
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if (asb == null)
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return appendNull();
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int len = asb.length();
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ensureCapacityInternal(count + len);
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asb.getChars(0, len, value, count);
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count += len;
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return this;
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|
}
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|
|
|
// Documentation in subclasses because of synchro difference
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|
@Override
|
|
public AbstractStringBuilder append(CharSequence s) {
|
|
if (s == null)
|
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return appendNull();
|
|
if (s instanceof String)
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return this.append((String)s);
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|
if (s instanceof AbstractStringBuilder)
|
|
return this.append((AbstractStringBuilder)s);
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return this.append(s, 0, s.length());
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|
}
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|
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private AbstractStringBuilder appendNull() {
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|
int c = count;
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ensureCapacityInternal(c + 4);
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|
final char[] value = this.value;
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|
value[c++] = 'n';
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value[c++] = 'u';
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|
value[c++] = 'l';
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value[c++] = 'l';
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count = c;
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|
return this;
|
|
}
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|
|
|
/**
|
|
* Appends a subsequence of the specified {@code CharSequence} to this
|
|
* sequence.
|
|
* <p>
|
|
* Characters of the argument {@code s}, starting at
|
|
* index {@code start}, are appended, in order, to the contents of
|
|
* this sequence up to the (exclusive) index {@code end}. The length
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|
* of this sequence is increased by the value of {@code end - start}.
|
|
* <p>
|
|
* Let <i>n</i> be the length of this character sequence just prior to
|
|
* execution of the {@code append} method. Then the character at
|
|
* index <i>k</i> in this character sequence becomes equal to the
|
|
* character at index <i>k</i> in this sequence, if <i>k</i> is less than
|
|
* <i>n</i>; otherwise, it is equal to the character at index
|
|
* <i>k+start-n</i> in the argument {@code s}.
|
|
* <p>
|
|
* If {@code s} is {@code null}, then this method appends
|
|
* characters as if the s parameter was a sequence containing the four
|
|
* characters {@code "null"}.
|
|
*
|
|
* @param s the sequence to append.
|
|
* @param start the starting index of the subsequence to be appended.
|
|
* @param end the end index of the subsequence to be appended.
|
|
* @return a reference to this object.
|
|
* @throws IndexOutOfBoundsException if
|
|
* {@code start} is negative, or
|
|
* {@code start} is greater than {@code end} or
|
|
* {@code end} is greater than {@code s.length()}
|
|
*/
|
|
@Override
|
|
public AbstractStringBuilder append(CharSequence s, int start, int end) {
|
|
if (s == null)
|
|
s = "null";
|
|
if ((start < 0) || (start > end) || (end > s.length()))
|
|
throw new IndexOutOfBoundsException(
|
|
"start " + start + ", end " + end + ", s.length() "
|
|
+ s.length());
|
|
int len = end - start;
|
|
ensureCapacityInternal(count + len);
|
|
for (int i = start, j = count; i < end; i++, j++)
|
|
value[j] = s.charAt(i);
|
|
count += len;
|
|
return this;
|
|
}
|
|
|
|
/**
|
|
* Appends the string representation of the {@code char} array
|
|
* argument to this sequence.
|
|
* <p>
|
|
* The characters of the array argument are appended, in order, to
|
|
* the contents of this sequence. The length of this sequence
|
|
* increases by the length of the argument.
|
|
* <p>
|
|
* The overall effect is exactly as if the argument were converted
|
|
* to a string by the method {@link String#valueOf(char[])},
|
|
* and the characters of that string were then
|
|
* {@link #append(String) appended} to this character sequence.
|
|
*
|
|
* @param str the characters to be appended.
|
|
* @return a reference to this object.
|
|
*/
|
|
public AbstractStringBuilder append(char[] str) {
|
|
int len = str.length;
|
|
ensureCapacityInternal(count + len);
|
|
System.arraycopy(str, 0, value, count, len);
|
|
count += len;
|
|
return this;
|
|
}
|
|
|
|
/**
|
|
* Appends the string representation of a subarray of the
|
|
* {@code char} array argument to this sequence.
|
|
* <p>
|
|
* Characters of the {@code char} array {@code str}, starting at
|
|
* index {@code offset}, are appended, in order, to the contents
|
|
* of this sequence. The length of this sequence increases
|
|
* by the value of {@code len}.
|
|
* <p>
|
|
* The overall effect is exactly as if the arguments were converted
|
|
* to a string by the method {@link String#valueOf(char[],int,int)},
|
|
* and the characters of that string were then
|
|
* {@link #append(String) appended} to this character sequence.
|
|
*
|
|
* @param str the characters to be appended.
|
|
* @param offset the index of the first {@code char} to append.
|
|
* @param len the number of {@code char}s to append.
|
|
* @return a reference to this object.
|
|
* @throws IndexOutOfBoundsException
|
|
* if {@code offset < 0} or {@code len < 0}
|
|
* or {@code offset+len > str.length}
|
|
*/
|
|
public AbstractStringBuilder append(char str[], int offset, int len) {
|
|
if (len > 0) // let arraycopy report AIOOBE for len < 0
|
|
ensureCapacityInternal(count + len);
|
|
System.arraycopy(str, offset, value, count, len);
|
|
count += len;
|
|
return this;
|
|
}
|
|
|
|
/**
|
|
* Appends the string representation of the {@code boolean}
|
|
* argument to the sequence.
|
|
* <p>
|
|
* The overall effect is exactly as if the argument were converted
|
|
* to a string by the method {@link String#valueOf(boolean)},
|
|
* and the characters of that string were then
|
|
* {@link #append(String) appended} to this character sequence.
|
|
*
|
|
* @param b a {@code boolean}.
|
|
* @return a reference to this object.
|
|
*/
|
|
public AbstractStringBuilder append(boolean b) {
|
|
if (b) {
|
|
ensureCapacityInternal(count + 4);
|
|
value[count++] = 't';
|
|
value[count++] = 'r';
|
|
value[count++] = 'u';
|
|
value[count++] = 'e';
|
|
} else {
|
|
ensureCapacityInternal(count + 5);
|
|
value[count++] = 'f';
|
|
value[count++] = 'a';
|
|
value[count++] = 'l';
|
|
value[count++] = 's';
|
|
value[count++] = 'e';
|
|
}
|
|
return this;
|
|
}
|
|
|
|
/**
|
|
* Appends the string representation of the {@code char}
|
|
* argument to this sequence.
|
|
* <p>
|
|
* The argument is appended to the contents of this sequence.
|
|
* The length of this sequence increases by {@code 1}.
|
|
* <p>
|
|
* The overall effect is exactly as if the argument were converted
|
|
* to a string by the method {@link String#valueOf(char)},
|
|
* and the character in that string were then
|
|
* {@link #append(String) appended} to this character sequence.
|
|
*
|
|
* @param c a {@code char}.
|
|
* @return a reference to this object.
|
|
*/
|
|
@Override
|
|
public AbstractStringBuilder append(char c) {
|
|
ensureCapacityInternal(count + 1);
|
|
value[count++] = c;
|
|
return this;
|
|
}
|
|
|
|
/**
|
|
* Appends the string representation of the {@code int}
|
|
* argument to this sequence.
|
|
* <p>
|
|
* The overall effect is exactly as if the argument were converted
|
|
* to a string by the method {@link String#valueOf(int)},
|
|
* and the characters of that string were then
|
|
* {@link #append(String) appended} to this character sequence.
|
|
*
|
|
* @param i an {@code int}.
|
|
* @return a reference to this object.
|
|
*/
|
|
public AbstractStringBuilder append(int i) {
|
|
if (i == Integer.MIN_VALUE) {
|
|
append("-2147483648");
|
|
return this;
|
|
}
|
|
int appendedLength = (i < 0) ? Integer.stringSize(-i) + 1
|
|
: Integer.stringSize(i);
|
|
int spaceNeeded = count + appendedLength;
|
|
ensureCapacityInternal(spaceNeeded);
|
|
Integer.getChars(i, spaceNeeded, value);
|
|
count = spaceNeeded;
|
|
return this;
|
|
}
|
|
|
|
/**
|
|
* Appends the string representation of the {@code long}
|
|
* argument to this sequence.
|
|
* <p>
|
|
* The overall effect is exactly as if the argument were converted
|
|
* to a string by the method {@link String#valueOf(long)},
|
|
* and the characters of that string were then
|
|
* {@link #append(String) appended} to this character sequence.
|
|
*
|
|
* @param l a {@code long}.
|
|
* @return a reference to this object.
|
|
*/
|
|
public AbstractStringBuilder append(long l) {
|
|
if (l == Long.MIN_VALUE) {
|
|
append("-9223372036854775808");
|
|
return this;
|
|
}
|
|
int appendedLength = (l < 0) ? Long.stringSize(-l) + 1
|
|
: Long.stringSize(l);
|
|
int spaceNeeded = count + appendedLength;
|
|
ensureCapacityInternal(spaceNeeded);
|
|
Long.getChars(l, spaceNeeded, value);
|
|
count = spaceNeeded;
|
|
return this;
|
|
}
|
|
|
|
/**
|
|
* Appends the string representation of the {@code float}
|
|
* argument to this sequence.
|
|
* <p>
|
|
* The overall effect is exactly as if the argument were converted
|
|
* to a string by the method {@link String#valueOf(float)},
|
|
* and the characters of that string were then
|
|
* {@link #append(String) appended} to this character sequence.
|
|
*
|
|
* @param f a {@code float}.
|
|
* @return a reference to this object.
|
|
*/
|
|
public AbstractStringBuilder append(float f) {
|
|
FloatingDecimal.appendTo(f,this);
|
|
return this;
|
|
}
|
|
|
|
/**
|
|
* Appends the string representation of the {@code double}
|
|
* argument to this sequence.
|
|
* <p>
|
|
* The overall effect is exactly as if the argument were converted
|
|
* to a string by the method {@link String#valueOf(double)},
|
|
* and the characters of that string were then
|
|
* {@link #append(String) appended} to this character sequence.
|
|
*
|
|
* @param d a {@code double}.
|
|
* @return a reference to this object.
|
|
*/
|
|
public AbstractStringBuilder append(double d) {
|
|
FloatingDecimal.appendTo(d,this);
|
|
return this;
|
|
}
|
|
|
|
/**
|
|
* Removes the characters in a substring of this sequence.
|
|
* The substring begins at the specified {@code start} and extends to
|
|
* the character at index {@code end - 1} or to the end of the
|
|
* sequence if no such character exists. If
|
|
* {@code start} is equal to {@code end}, no changes are made.
|
|
*
|
|
* @param start The beginning index, inclusive.
|
|
* @param end The ending index, exclusive.
|
|
* @return This object.
|
|
* @throws StringIndexOutOfBoundsException if {@code start}
|
|
* is negative, greater than {@code length()}, or
|
|
* greater than {@code end}.
|
|
*/
|
|
public AbstractStringBuilder delete(int start, int end) {
|
|
if (start < 0)
|
|
throw new StringIndexOutOfBoundsException(start);
|
|
if (end > count)
|
|
end = count;
|
|
if (start > end)
|
|
throw new StringIndexOutOfBoundsException();
|
|
int len = end - start;
|
|
if (len > 0) {
|
|
System.arraycopy(value, start+len, value, start, count-end);
|
|
count -= len;
|
|
}
|
|
return this;
|
|
}
|
|
|
|
/**
|
|
* Appends the string representation of the {@code codePoint}
|
|
* argument to this sequence.
|
|
*
|
|
* <p> The argument is appended to the contents of this sequence.
|
|
* The length of this sequence increases by
|
|
* {@link Character#charCount(int) Character.charCount(codePoint)}.
|
|
*
|
|
* <p> The overall effect is exactly as if the argument were
|
|
* converted to a {@code char} array by the method
|
|
* {@link Character#toChars(int)} and the character in that array
|
|
* were then {@link #append(char[]) appended} to this character
|
|
* sequence.
|
|
*
|
|
* @param codePoint a Unicode code point
|
|
* @return a reference to this object.
|
|
* @exception IllegalArgumentException if the specified
|
|
* {@code codePoint} isn't a valid Unicode code point
|
|
*/
|
|
public AbstractStringBuilder appendCodePoint(int codePoint) {
|
|
final int count = this.count;
|
|
|
|
if (Character.isBmpCodePoint(codePoint)) {
|
|
ensureCapacityInternal(count + 1);
|
|
value[count] = (char) codePoint;
|
|
this.count = count + 1;
|
|
} else if (Character.isValidCodePoint(codePoint)) {
|
|
ensureCapacityInternal(count + 2);
|
|
Character.toSurrogates(codePoint, value, count);
|
|
this.count = count + 2;
|
|
} else {
|
|
throw new IllegalArgumentException();
|
|
}
|
|
return this;
|
|
}
|
|
|
|
/**
|
|
* Removes the {@code char} at the specified position in this
|
|
* sequence. This sequence is shortened by one {@code char}.
|
|
*
|
|
* <p>Note: If the character at the given index is a supplementary
|
|
* character, this method does not remove the entire character. If
|
|
* correct handling of supplementary characters is required,
|
|
* determine the number of {@code char}s to remove by calling
|
|
* {@code Character.charCount(thisSequence.codePointAt(index))},
|
|
* where {@code thisSequence} is this sequence.
|
|
*
|
|
* @param index Index of {@code char} to remove
|
|
* @return This object.
|
|
* @throws StringIndexOutOfBoundsException if the {@code index}
|
|
* is negative or greater than or equal to
|
|
* {@code length()}.
|
|
*/
|
|
public AbstractStringBuilder deleteCharAt(int index) {
|
|
if ((index < 0) || (index >= count))
|
|
throw new StringIndexOutOfBoundsException(index);
|
|
System.arraycopy(value, index+1, value, index, count-index-1);
|
|
count--;
|
|
return this;
|
|
}
|
|
|
|
/**
|
|
* Replaces the characters in a substring of this sequence
|
|
* with characters in the specified {@code String}. The substring
|
|
* begins at the specified {@code start} and extends to the character
|
|
* at index {@code end - 1} or to the end of the
|
|
* sequence if no such character exists. First the
|
|
* characters in the substring are removed and then the specified
|
|
* {@code String} is inserted at {@code start}. (This
|
|
* sequence will be lengthened to accommodate the
|
|
* specified String if necessary.)
|
|
*
|
|
* @param start The beginning index, inclusive.
|
|
* @param end The ending index, exclusive.
|
|
* @param str String that will replace previous contents.
|
|
* @return This object.
|
|
* @throws StringIndexOutOfBoundsException if {@code start}
|
|
* is negative, greater than {@code length()}, or
|
|
* greater than {@code end}.
|
|
*/
|
|
public AbstractStringBuilder replace(int start, int end, String str) {
|
|
if (start < 0)
|
|
throw new StringIndexOutOfBoundsException(start);
|
|
if (start > count)
|
|
throw new StringIndexOutOfBoundsException("start > length()");
|
|
if (start > end)
|
|
throw new StringIndexOutOfBoundsException("start > end");
|
|
|
|
if (end > count)
|
|
end = count;
|
|
int len = str.length();
|
|
int newCount = count + len - (end - start);
|
|
ensureCapacityInternal(newCount);
|
|
|
|
System.arraycopy(value, end, value, start + len, count - end);
|
|
str.getChars(value, start);
|
|
count = newCount;
|
|
return this;
|
|
}
|
|
|
|
/**
|
|
* Returns a new {@code String} that contains a subsequence of
|
|
* characters currently contained in this character sequence. The
|
|
* substring begins at the specified index and extends to the end of
|
|
* this sequence.
|
|
*
|
|
* @param start The beginning index, inclusive.
|
|
* @return The new string.
|
|
* @throws StringIndexOutOfBoundsException if {@code start} is
|
|
* less than zero, or greater than the length of this object.
|
|
*/
|
|
public String substring(int start) {
|
|
return substring(start, count);
|
|
}
|
|
|
|
/**
|
|
* Returns a new character sequence that is a subsequence of this sequence.
|
|
*
|
|
* <p> An invocation of this method of the form
|
|
*
|
|
* <pre>{@code
|
|
* sb.subSequence(begin, end)}</pre>
|
|
*
|
|
* behaves in exactly the same way as the invocation
|
|
*
|
|
* <pre>{@code
|
|
* sb.substring(begin, end)}</pre>
|
|
*
|
|
* This method is provided so that this class can
|
|
* implement the {@link CharSequence} interface.
|
|
*
|
|
* @param start the start index, inclusive.
|
|
* @param end the end index, exclusive.
|
|
* @return the specified subsequence.
|
|
*
|
|
* @throws IndexOutOfBoundsException
|
|
* if {@code start} or {@code end} are negative,
|
|
* if {@code end} is greater than {@code length()},
|
|
* or if {@code start} is greater than {@code end}
|
|
* @spec JSR-51
|
|
*/
|
|
@Override
|
|
public CharSequence subSequence(int start, int end) {
|
|
return substring(start, end);
|
|
}
|
|
|
|
/**
|
|
* Returns a new {@code String} that contains a subsequence of
|
|
* characters currently contained in this sequence. The
|
|
* substring begins at the specified {@code start} and
|
|
* extends to the character at index {@code end - 1}.
|
|
*
|
|
* @param start The beginning index, inclusive.
|
|
* @param end The ending index, exclusive.
|
|
* @return The new string.
|
|
* @throws StringIndexOutOfBoundsException if {@code start}
|
|
* or {@code end} are negative or greater than
|
|
* {@code length()}, or {@code start} is
|
|
* greater than {@code end}.
|
|
*/
|
|
public String substring(int start, int end) {
|
|
if (start < 0)
|
|
throw new StringIndexOutOfBoundsException(start);
|
|
if (end > count)
|
|
throw new StringIndexOutOfBoundsException(end);
|
|
if (start > end)
|
|
throw new StringIndexOutOfBoundsException(end - start);
|
|
return new String(value, start, end - start);
|
|
}
|
|
|
|
/**
|
|
* Inserts the string representation of a subarray of the {@code str}
|
|
* array argument into this sequence. The subarray begins at the
|
|
* specified {@code offset} and extends {@code len} {@code char}s.
|
|
* The characters of the subarray are inserted into this sequence at
|
|
* the position indicated by {@code index}. The length of this
|
|
* sequence increases by {@code len} {@code char}s.
|
|
*
|
|
* @param index position at which to insert subarray.
|
|
* @param str A {@code char} array.
|
|
* @param offset the index of the first {@code char} in subarray to
|
|
* be inserted.
|
|
* @param len the number of {@code char}s in the subarray to
|
|
* be inserted.
|
|
* @return This object
|
|
* @throws StringIndexOutOfBoundsException if {@code index}
|
|
* is negative or greater than {@code length()}, or
|
|
* {@code offset} or {@code len} are negative, or
|
|
* {@code (offset+len)} is greater than
|
|
* {@code str.length}.
|
|
*/
|
|
public AbstractStringBuilder insert(int index, char[] str, int offset,
|
|
int len)
|
|
{
|
|
if ((index < 0) || (index > length()))
|
|
throw new StringIndexOutOfBoundsException(index);
|
|
if ((offset < 0) || (len < 0) || (offset > str.length - len))
|
|
throw new StringIndexOutOfBoundsException(
|
|
"offset " + offset + ", len " + len + ", str.length "
|
|
+ str.length);
|
|
ensureCapacityInternal(count + len);
|
|
System.arraycopy(value, index, value, index + len, count - index);
|
|
System.arraycopy(str, offset, value, index, len);
|
|
count += len;
|
|
return this;
|
|
}
|
|
|
|
/**
|
|
* Inserts the string representation of the {@code Object}
|
|
* argument into this character sequence.
|
|
* <p>
|
|
* The overall effect is exactly as if the second argument were
|
|
* converted to a string by the method {@link String#valueOf(Object)},
|
|
* and the characters of that string were then
|
|
* {@link #insert(int,String) inserted} into this character
|
|
* sequence at the indicated offset.
|
|
* <p>
|
|
* The {@code offset} argument must be greater than or equal to
|
|
* {@code 0}, and less than or equal to the {@linkplain #length() length}
|
|
* of this sequence.
|
|
*
|
|
* @param offset the offset.
|
|
* @param obj an {@code Object}.
|
|
* @return a reference to this object.
|
|
* @throws StringIndexOutOfBoundsException if the offset is invalid.
|
|
*/
|
|
public AbstractStringBuilder insert(int offset, Object obj) {
|
|
return insert(offset, String.valueOf(obj));
|
|
}
|
|
|
|
/**
|
|
* Inserts the string into this character sequence.
|
|
* <p>
|
|
* The characters of the {@code String} argument are inserted, in
|
|
* order, into this sequence at the indicated offset, moving up any
|
|
* characters originally above that position and increasing the length
|
|
* of this sequence by the length of the argument. If
|
|
* {@code str} is {@code null}, then the four characters
|
|
* {@code "null"} are inserted into this sequence.
|
|
* <p>
|
|
* The character at index <i>k</i> in the new character sequence is
|
|
* equal to:
|
|
* <ul>
|
|
* <li>the character at index <i>k</i> in the old character sequence, if
|
|
* <i>k</i> is less than {@code offset}
|
|
* <li>the character at index <i>k</i>{@code -offset} in the
|
|
* argument {@code str}, if <i>k</i> is not less than
|
|
* {@code offset} but is less than {@code offset+str.length()}
|
|
* <li>the character at index <i>k</i>{@code -str.length()} in the
|
|
* old character sequence, if <i>k</i> is not less than
|
|
* {@code offset+str.length()}
|
|
* </ul><p>
|
|
* The {@code offset} argument must be greater than or equal to
|
|
* {@code 0}, and less than or equal to the {@linkplain #length() length}
|
|
* of this sequence.
|
|
*
|
|
* @param offset the offset.
|
|
* @param str a string.
|
|
* @return a reference to this object.
|
|
* @throws StringIndexOutOfBoundsException if the offset is invalid.
|
|
*/
|
|
public AbstractStringBuilder insert(int offset, String str) {
|
|
if ((offset < 0) || (offset > length()))
|
|
throw new StringIndexOutOfBoundsException(offset);
|
|
if (str == null)
|
|
str = "null";
|
|
int len = str.length();
|
|
ensureCapacityInternal(count + len);
|
|
System.arraycopy(value, offset, value, offset + len, count - offset);
|
|
str.getChars(value, offset);
|
|
count += len;
|
|
return this;
|
|
}
|
|
|
|
/**
|
|
* Inserts the string representation of the {@code char} array
|
|
* argument into this sequence.
|
|
* <p>
|
|
* The characters of the array argument are inserted into the
|
|
* contents of this sequence at the position indicated by
|
|
* {@code offset}. The length of this sequence increases by
|
|
* the length of the argument.
|
|
* <p>
|
|
* The overall effect is exactly as if the second argument were
|
|
* converted to a string by the method {@link String#valueOf(char[])},
|
|
* and the characters of that string were then
|
|
* {@link #insert(int,String) inserted} into this character
|
|
* sequence at the indicated offset.
|
|
* <p>
|
|
* The {@code offset} argument must be greater than or equal to
|
|
* {@code 0}, and less than or equal to the {@linkplain #length() length}
|
|
* of this sequence.
|
|
*
|
|
* @param offset the offset.
|
|
* @param str a character array.
|
|
* @return a reference to this object.
|
|
* @throws StringIndexOutOfBoundsException if the offset is invalid.
|
|
*/
|
|
public AbstractStringBuilder insert(int offset, char[] str) {
|
|
if ((offset < 0) || (offset > length()))
|
|
throw new StringIndexOutOfBoundsException(offset);
|
|
int len = str.length;
|
|
ensureCapacityInternal(count + len);
|
|
System.arraycopy(value, offset, value, offset + len, count - offset);
|
|
System.arraycopy(str, 0, value, offset, len);
|
|
count += len;
|
|
return this;
|
|
}
|
|
|
|
/**
|
|
* Inserts the specified {@code CharSequence} into this sequence.
|
|
* <p>
|
|
* The characters of the {@code CharSequence} argument are inserted,
|
|
* in order, into this sequence at the indicated offset, moving up
|
|
* any characters originally above that position and increasing the length
|
|
* of this sequence by the length of the argument s.
|
|
* <p>
|
|
* The result of this method is exactly the same as if it were an
|
|
* invocation of this object's
|
|
* {@link #insert(int,CharSequence,int,int) insert}(dstOffset, s, 0, s.length())
|
|
* method.
|
|
*
|
|
* <p>If {@code s} is {@code null}, then the four characters
|
|
* {@code "null"} are inserted into this sequence.
|
|
*
|
|
* @param dstOffset the offset.
|
|
* @param s the sequence to be inserted
|
|
* @return a reference to this object.
|
|
* @throws IndexOutOfBoundsException if the offset is invalid.
|
|
*/
|
|
public AbstractStringBuilder insert(int dstOffset, CharSequence s) {
|
|
if (s == null)
|
|
s = "null";
|
|
if (s instanceof String)
|
|
return this.insert(dstOffset, (String)s);
|
|
return this.insert(dstOffset, s, 0, s.length());
|
|
}
|
|
|
|
/**
|
|
* Inserts a subsequence of the specified {@code CharSequence} into
|
|
* this sequence.
|
|
* <p>
|
|
* The subsequence of the argument {@code s} specified by
|
|
* {@code start} and {@code end} are inserted,
|
|
* in order, into this sequence at the specified destination offset, moving
|
|
* up any characters originally above that position. The length of this
|
|
* sequence is increased by {@code end - start}.
|
|
* <p>
|
|
* The character at index <i>k</i> in this sequence becomes equal to:
|
|
* <ul>
|
|
* <li>the character at index <i>k</i> in this sequence, if
|
|
* <i>k</i> is less than {@code dstOffset}
|
|
* <li>the character at index <i>k</i>{@code +start-dstOffset} in
|
|
* the argument {@code s}, if <i>k</i> is greater than or equal to
|
|
* {@code dstOffset} but is less than {@code dstOffset+end-start}
|
|
* <li>the character at index <i>k</i>{@code -(end-start)} in this
|
|
* sequence, if <i>k</i> is greater than or equal to
|
|
* {@code dstOffset+end-start}
|
|
* </ul><p>
|
|
* The {@code dstOffset} argument must be greater than or equal to
|
|
* {@code 0}, and less than or equal to the {@linkplain #length() length}
|
|
* of this sequence.
|
|
* <p>The start argument must be nonnegative, and not greater than
|
|
* {@code end}.
|
|
* <p>The end argument must be greater than or equal to
|
|
* {@code start}, and less than or equal to the length of s.
|
|
*
|
|
* <p>If {@code s} is {@code null}, then this method inserts
|
|
* characters as if the s parameter was a sequence containing the four
|
|
* characters {@code "null"}.
|
|
*
|
|
* @param dstOffset the offset in this sequence.
|
|
* @param s the sequence to be inserted.
|
|
* @param start the starting index of the subsequence to be inserted.
|
|
* @param end the end index of the subsequence to be inserted.
|
|
* @return a reference to this object.
|
|
* @throws IndexOutOfBoundsException if {@code dstOffset}
|
|
* is negative or greater than {@code this.length()}, or
|
|
* {@code start} or {@code end} are negative, or
|
|
* {@code start} is greater than {@code end} or
|
|
* {@code end} is greater than {@code s.length()}
|
|
*/
|
|
public AbstractStringBuilder insert(int dstOffset, CharSequence s,
|
|
int start, int end) {
|
|
if (s == null)
|
|
s = "null";
|
|
if ((dstOffset < 0) || (dstOffset > this.length()))
|
|
throw new IndexOutOfBoundsException("dstOffset "+dstOffset);
|
|
if ((start < 0) || (end < 0) || (start > end) || (end > s.length()))
|
|
throw new IndexOutOfBoundsException(
|
|
"start " + start + ", end " + end + ", s.length() "
|
|
+ s.length());
|
|
int len = end - start;
|
|
ensureCapacityInternal(count + len);
|
|
System.arraycopy(value, dstOffset, value, dstOffset + len,
|
|
count - dstOffset);
|
|
for (int i=start; i<end; i++)
|
|
value[dstOffset++] = s.charAt(i);
|
|
count += len;
|
|
return this;
|
|
}
|
|
|
|
/**
|
|
* Inserts the string representation of the {@code boolean}
|
|
* argument into this sequence.
|
|
* <p>
|
|
* The overall effect is exactly as if the second argument were
|
|
* converted to a string by the method {@link String#valueOf(boolean)},
|
|
* and the characters of that string were then
|
|
* {@link #insert(int,String) inserted} into this character
|
|
* sequence at the indicated offset.
|
|
* <p>
|
|
* The {@code offset} argument must be greater than or equal to
|
|
* {@code 0}, and less than or equal to the {@linkplain #length() length}
|
|
* of this sequence.
|
|
*
|
|
* @param offset the offset.
|
|
* @param b a {@code boolean}.
|
|
* @return a reference to this object.
|
|
* @throws StringIndexOutOfBoundsException if the offset is invalid.
|
|
*/
|
|
public AbstractStringBuilder insert(int offset, boolean b) {
|
|
return insert(offset, String.valueOf(b));
|
|
}
|
|
|
|
/**
|
|
* Inserts the string representation of the {@code char}
|
|
* argument into this sequence.
|
|
* <p>
|
|
* The overall effect is exactly as if the second argument were
|
|
* converted to a string by the method {@link String#valueOf(char)},
|
|
* and the character in that string were then
|
|
* {@link #insert(int,String) inserted} into this character
|
|
* sequence at the indicated offset.
|
|
* <p>
|
|
* The {@code offset} argument must be greater than or equal to
|
|
* {@code 0}, and less than or equal to the {@linkplain #length() length}
|
|
* of this sequence.
|
|
*
|
|
* @param offset the offset.
|
|
* @param c a {@code char}.
|
|
* @return a reference to this object.
|
|
* @throws IndexOutOfBoundsException if the offset is invalid.
|
|
*/
|
|
public AbstractStringBuilder insert(int offset, char c) {
|
|
ensureCapacityInternal(count + 1);
|
|
System.arraycopy(value, offset, value, offset + 1, count - offset);
|
|
value[offset] = c;
|
|
count += 1;
|
|
return this;
|
|
}
|
|
|
|
/**
|
|
* Inserts the string representation of the second {@code int}
|
|
* argument into this sequence.
|
|
* <p>
|
|
* The overall effect is exactly as if the second argument were
|
|
* converted to a string by the method {@link String#valueOf(int)},
|
|
* and the characters of that string were then
|
|
* {@link #insert(int,String) inserted} into this character
|
|
* sequence at the indicated offset.
|
|
* <p>
|
|
* The {@code offset} argument must be greater than or equal to
|
|
* {@code 0}, and less than or equal to the {@linkplain #length() length}
|
|
* of this sequence.
|
|
*
|
|
* @param offset the offset.
|
|
* @param i an {@code int}.
|
|
* @return a reference to this object.
|
|
* @throws StringIndexOutOfBoundsException if the offset is invalid.
|
|
*/
|
|
public AbstractStringBuilder insert(int offset, int i) {
|
|
return insert(offset, String.valueOf(i));
|
|
}
|
|
|
|
/**
|
|
* Inserts the string representation of the {@code long}
|
|
* argument into this sequence.
|
|
* <p>
|
|
* The overall effect is exactly as if the second argument were
|
|
* converted to a string by the method {@link String#valueOf(long)},
|
|
* and the characters of that string were then
|
|
* {@link #insert(int,String) inserted} into this character
|
|
* sequence at the indicated offset.
|
|
* <p>
|
|
* The {@code offset} argument must be greater than or equal to
|
|
* {@code 0}, and less than or equal to the {@linkplain #length() length}
|
|
* of this sequence.
|
|
*
|
|
* @param offset the offset.
|
|
* @param l a {@code long}.
|
|
* @return a reference to this object.
|
|
* @throws StringIndexOutOfBoundsException if the offset is invalid.
|
|
*/
|
|
public AbstractStringBuilder insert(int offset, long l) {
|
|
return insert(offset, String.valueOf(l));
|
|
}
|
|
|
|
/**
|
|
* Inserts the string representation of the {@code float}
|
|
* argument into this sequence.
|
|
* <p>
|
|
* The overall effect is exactly as if the second argument were
|
|
* converted to a string by the method {@link String#valueOf(float)},
|
|
* and the characters of that string were then
|
|
* {@link #insert(int,String) inserted} into this character
|
|
* sequence at the indicated offset.
|
|
* <p>
|
|
* The {@code offset} argument must be greater than or equal to
|
|
* {@code 0}, and less than or equal to the {@linkplain #length() length}
|
|
* of this sequence.
|
|
*
|
|
* @param offset the offset.
|
|
* @param f a {@code float}.
|
|
* @return a reference to this object.
|
|
* @throws StringIndexOutOfBoundsException if the offset is invalid.
|
|
*/
|
|
public AbstractStringBuilder insert(int offset, float f) {
|
|
return insert(offset, String.valueOf(f));
|
|
}
|
|
|
|
/**
|
|
* Inserts the string representation of the {@code double}
|
|
* argument into this sequence.
|
|
* <p>
|
|
* The overall effect is exactly as if the second argument were
|
|
* converted to a string by the method {@link String#valueOf(double)},
|
|
* and the characters of that string were then
|
|
* {@link #insert(int,String) inserted} into this character
|
|
* sequence at the indicated offset.
|
|
* <p>
|
|
* The {@code offset} argument must be greater than or equal to
|
|
* {@code 0}, and less than or equal to the {@linkplain #length() length}
|
|
* of this sequence.
|
|
*
|
|
* @param offset the offset.
|
|
* @param d a {@code double}.
|
|
* @return a reference to this object.
|
|
* @throws StringIndexOutOfBoundsException if the offset is invalid.
|
|
*/
|
|
public AbstractStringBuilder insert(int offset, double d) {
|
|
return insert(offset, String.valueOf(d));
|
|
}
|
|
|
|
/**
|
|
* Returns the index within this string of the first occurrence of the
|
|
* specified substring. The integer returned is the smallest value
|
|
* <i>k</i> such that:
|
|
* <pre>{@code
|
|
* this.toString().startsWith(str, <i>k</i>)
|
|
* }</pre>
|
|
* is {@code true}.
|
|
*
|
|
* @param str any string.
|
|
* @return if the string argument occurs as a substring within this
|
|
* object, then the index of the first character of the first
|
|
* such substring is returned; if it does not occur as a
|
|
* substring, {@code -1} is returned.
|
|
*/
|
|
public int indexOf(String str) {
|
|
return indexOf(str, 0);
|
|
}
|
|
|
|
/**
|
|
* Returns the index within this string of the first occurrence of the
|
|
* specified substring, starting at the specified index. The integer
|
|
* returned is the smallest value {@code k} for which:
|
|
* <pre>{@code
|
|
* k >= Math.min(fromIndex, this.length()) &&
|
|
* this.toString().startsWith(str, k)
|
|
* }</pre>
|
|
* If no such value of <i>k</i> exists, then -1 is returned.
|
|
*
|
|
* @param str the substring for which to search.
|
|
* @param fromIndex the index from which to start the search.
|
|
* @return the index within this string of the first occurrence of the
|
|
* specified substring, starting at the specified index.
|
|
*/
|
|
public int indexOf(String str, int fromIndex) {
|
|
return String.indexOf(value, 0, count, str, fromIndex);
|
|
}
|
|
|
|
/**
|
|
* Returns the index within this string of the rightmost occurrence
|
|
* of the specified substring. The rightmost empty string "" is
|
|
* considered to occur at the index value {@code this.length()}.
|
|
* The returned index is the largest value <i>k</i> such that
|
|
* <pre>{@code
|
|
* this.toString().startsWith(str, k)
|
|
* }</pre>
|
|
* is true.
|
|
*
|
|
* @param str the substring to search for.
|
|
* @return if the string argument occurs one or more times as a substring
|
|
* within this object, then the index of the first character of
|
|
* the last such substring is returned. If it does not occur as
|
|
* a substring, {@code -1} is returned.
|
|
*/
|
|
public int lastIndexOf(String str) {
|
|
return lastIndexOf(str, count);
|
|
}
|
|
|
|
/**
|
|
* Returns the index within this string of the last occurrence of the
|
|
* specified substring. The integer returned is the largest value <i>k</i>
|
|
* such that:
|
|
* <pre>{@code
|
|
* k <= Math.min(fromIndex, this.length()) &&
|
|
* this.toString().startsWith(str, k)
|
|
* }</pre>
|
|
* If no such value of <i>k</i> exists, then -1 is returned.
|
|
*
|
|
* @param str the substring to search for.
|
|
* @param fromIndex the index to start the search from.
|
|
* @return the index within this sequence of the last occurrence of the
|
|
* specified substring.
|
|
*/
|
|
public int lastIndexOf(String str, int fromIndex) {
|
|
return String.lastIndexOf(value, 0, count, str, fromIndex);
|
|
}
|
|
|
|
/**
|
|
* Causes this character sequence to be replaced by the reverse of
|
|
* the sequence. If there are any surrogate pairs included in the
|
|
* sequence, these are treated as single characters for the
|
|
* reverse operation. Thus, the order of the high-low surrogates
|
|
* is never reversed.
|
|
*
|
|
* Let <i>n</i> be the character length of this character sequence
|
|
* (not the length in {@code char} values) just prior to
|
|
* execution of the {@code reverse} method. Then the
|
|
* character at index <i>k</i> in the new character sequence is
|
|
* equal to the character at index <i>n-k-1</i> in the old
|
|
* character sequence.
|
|
*
|
|
* <p>Note that the reverse operation may result in producing
|
|
* surrogate pairs that were unpaired low-surrogates and
|
|
* high-surrogates before the operation. For example, reversing
|
|
* "\u005CuDC00\u005CuD800" produces "\u005CuD800\u005CuDC00" which is
|
|
* a valid surrogate pair.
|
|
*
|
|
* @return a reference to this object.
|
|
*/
|
|
public AbstractStringBuilder reverse() {
|
|
boolean hasSurrogates = false;
|
|
int n = count - 1;
|
|
for (int j = (n-1) >> 1; j >= 0; j--) {
|
|
int k = n - j;
|
|
char cj = value[j];
|
|
char ck = value[k];
|
|
value[j] = ck;
|
|
value[k] = cj;
|
|
if (Character.isSurrogate(cj) ||
|
|
Character.isSurrogate(ck)) {
|
|
hasSurrogates = true;
|
|
}
|
|
}
|
|
if (hasSurrogates) {
|
|
reverseAllValidSurrogatePairs();
|
|
}
|
|
return this;
|
|
}
|
|
|
|
/** Outlined helper method for reverse() */
|
|
private void reverseAllValidSurrogatePairs() {
|
|
for (int i = 0; i < count - 1; i++) {
|
|
char c2 = value[i];
|
|
if (Character.isLowSurrogate(c2)) {
|
|
char c1 = value[i + 1];
|
|
if (Character.isHighSurrogate(c1)) {
|
|
value[i++] = c1;
|
|
value[i] = c2;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Returns a string representing the data in this sequence.
|
|
* A new {@code String} object is allocated and initialized to
|
|
* contain the character sequence currently represented by this
|
|
* object. This {@code String} is then returned. Subsequent
|
|
* changes to this sequence do not affect the contents of the
|
|
* {@code String}.
|
|
*
|
|
* @return a string representation of this sequence of characters.
|
|
*/
|
|
@Override
|
|
public abstract String toString();
|
|
|
|
/**
|
|
* Needed by {@code String} for the contentEquals method.
|
|
*/
|
|
final char[] getValue() {
|
|
return value;
|
|
}
|
|
|
|
}
|