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440 lines
12 KiB
440 lines
12 KiB
/*
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* Copyright (c) 2003, 2013, 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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/**
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* A mutable sequence of characters. This class provides an API compatible
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* with {@code StringBuffer}, but with no guarantee of synchronization.
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* This class is designed for use as a drop-in replacement for
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* {@code StringBuffer} in places where the string buffer was being
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* used by a single thread (as is generally the case). Where possible,
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* it is recommended that this class be used in preference to
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* {@code StringBuffer} as it will be faster under most implementations.
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*
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* <p>The principal operations on a {@code StringBuilder} are the
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* {@code append} and {@code insert} methods, which are
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* overloaded so as to accept data of any type. Each effectively
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* converts a given datum to a string and then appends or inserts the
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* characters of that string to the string builder. The
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* {@code append} method always adds these characters at the end
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* of the builder; the {@code insert} method adds the characters at
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* a specified point.
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* <p>
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* For example, if {@code z} refers to a string builder object
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* whose current contents are "{@code start}", then
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* the method call {@code z.append("le")} would cause the string
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* builder to contain "{@code startle}", whereas
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* {@code z.insert(4, "le")} would alter the string builder to
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* contain "{@code starlet}".
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* <p>
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* In general, if sb refers to an instance of a {@code StringBuilder},
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* then {@code sb.append(x)} has the same effect as
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* {@code sb.insert(sb.length(), x)}.
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* <p>
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* Every string builder has a capacity. As long as the length of the
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* character sequence contained in the string builder does not exceed
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* the capacity, it is not necessary to allocate a new internal
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* buffer. If the internal buffer overflows, it is automatically made larger.
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*
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* <p>Instances of {@code StringBuilder} are not safe for
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* use by multiple threads. If such synchronization is required then it is
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* recommended that {@link java.lang.StringBuffer} be used.
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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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* @see java.lang.StringBuffer
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* @see java.lang.String
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* @since 1.5
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*/
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public final class StringBuilder
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extends AbstractStringBuilder
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implements java.io.Serializable, CharSequence
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{
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/** use serialVersionUID for interoperability */
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static final long serialVersionUID = 4383685877147921099L;
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/**
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* Constructs a string builder with no characters in it and an
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* initial capacity of 16 characters.
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*/
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public StringBuilder() {
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super(16);
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}
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/**
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* Constructs a string builder with no characters in it and an
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* initial capacity specified by the {@code capacity} argument.
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*
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* @param capacity the initial capacity.
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* @throws NegativeArraySizeException if the {@code capacity}
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* argument is less than {@code 0}.
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*/
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public StringBuilder(int capacity) {
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super(capacity);
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}
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/**
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* Constructs a string builder initialized to the contents of the
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* specified string. The initial capacity of the string builder is
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* {@code 16} plus the length of the string argument.
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*
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* @param str the initial contents of the buffer.
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*/
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public StringBuilder(String str) {
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super(str.length() + 16);
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append(str);
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}
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/**
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* Constructs a string builder that contains the same characters
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* as the specified {@code CharSequence}. The initial capacity of
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* the string builder is {@code 16} plus the length of the
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* {@code CharSequence} argument.
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*
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* @param seq the sequence to copy.
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*/
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public StringBuilder(CharSequence seq) {
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this(seq.length() + 16);
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append(seq);
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}
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@Override
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public StringBuilder append(Object obj) {
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return append(String.valueOf(obj));
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}
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@Override
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public StringBuilder append(String str) {
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super.append(str);
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return this;
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}
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/**
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* Appends the specified {@code StringBuffer} to this sequence.
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* <p>
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* The characters of the {@code StringBuffer} argument are appended,
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* in order, to this sequence, increasing the
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* length of this sequence by the length of the argument.
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* If {@code sb} is {@code null}, then the four characters
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* {@code "null"} are appended to this sequence.
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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 index
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* <i>k</i> in the new character sequence is equal to the character at
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* index <i>k</i> in the old character sequence, if <i>k</i> is less than
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* <i>n</i>; otherwise, it is equal to the character at index <i>k-n</i>
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* in the argument {@code sb}.
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*
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* @param sb the {@code StringBuffer} to append.
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* @return a reference to this object.
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*/
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public StringBuilder append(StringBuffer sb) {
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super.append(sb);
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return this;
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}
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@Override
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public StringBuilder append(CharSequence s) {
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super.append(s);
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return this;
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}
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/**
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* @throws IndexOutOfBoundsException {@inheritDoc}
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*/
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@Override
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public StringBuilder append(CharSequence s, int start, int end) {
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super.append(s, start, end);
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return this;
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}
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@Override
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public StringBuilder append(char[] str) {
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super.append(str);
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return this;
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}
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/**
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* @throws IndexOutOfBoundsException {@inheritDoc}
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*/
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@Override
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public StringBuilder append(char[] str, int offset, int len) {
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super.append(str, offset, len);
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return this;
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}
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@Override
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public StringBuilder append(boolean b) {
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super.append(b);
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return this;
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}
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@Override
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public StringBuilder append(char c) {
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super.append(c);
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return this;
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}
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@Override
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public StringBuilder append(int i) {
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super.append(i);
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return this;
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}
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@Override
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public StringBuilder append(long lng) {
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super.append(lng);
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return this;
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}
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@Override
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public StringBuilder append(float f) {
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super.append(f);
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return this;
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}
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@Override
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public StringBuilder append(double d) {
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super.append(d);
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return this;
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}
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/**
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* @since 1.5
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*/
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@Override
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public StringBuilder appendCodePoint(int codePoint) {
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super.appendCodePoint(codePoint);
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return this;
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}
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/**
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* @throws StringIndexOutOfBoundsException {@inheritDoc}
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*/
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@Override
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public StringBuilder delete(int start, int end) {
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super.delete(start, end);
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return this;
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}
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/**
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* @throws StringIndexOutOfBoundsException {@inheritDoc}
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*/
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@Override
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public StringBuilder deleteCharAt(int index) {
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super.deleteCharAt(index);
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return this;
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}
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/**
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* @throws StringIndexOutOfBoundsException {@inheritDoc}
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*/
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@Override
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public StringBuilder replace(int start, int end, String str) {
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super.replace(start, end, str);
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return this;
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}
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/**
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* @throws StringIndexOutOfBoundsException {@inheritDoc}
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*/
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@Override
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public StringBuilder insert(int index, char[] str, int offset,
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int len)
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{
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super.insert(index, str, offset, len);
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return this;
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}
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/**
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* @throws StringIndexOutOfBoundsException {@inheritDoc}
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*/
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@Override
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public StringBuilder insert(int offset, Object obj) {
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super.insert(offset, obj);
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return this;
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}
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/**
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* @throws StringIndexOutOfBoundsException {@inheritDoc}
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*/
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@Override
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public StringBuilder insert(int offset, String str) {
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super.insert(offset, str);
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return this;
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}
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/**
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* @throws StringIndexOutOfBoundsException {@inheritDoc}
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*/
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@Override
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public StringBuilder insert(int offset, char[] str) {
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super.insert(offset, str);
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return this;
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}
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/**
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* @throws IndexOutOfBoundsException {@inheritDoc}
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*/
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@Override
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public StringBuilder insert(int dstOffset, CharSequence s) {
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super.insert(dstOffset, s);
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return this;
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}
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/**
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* @throws IndexOutOfBoundsException {@inheritDoc}
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*/
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@Override
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public StringBuilder insert(int dstOffset, CharSequence s,
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int start, int end)
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{
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super.insert(dstOffset, s, start, end);
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return this;
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}
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/**
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* @throws StringIndexOutOfBoundsException {@inheritDoc}
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*/
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@Override
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public StringBuilder insert(int offset, boolean b) {
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super.insert(offset, b);
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return this;
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}
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/**
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* @throws IndexOutOfBoundsException {@inheritDoc}
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*/
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@Override
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public StringBuilder insert(int offset, char c) {
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super.insert(offset, c);
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return this;
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}
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/**
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* @throws StringIndexOutOfBoundsException {@inheritDoc}
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*/
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@Override
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public StringBuilder insert(int offset, int i) {
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super.insert(offset, i);
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return this;
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}
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/**
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* @throws StringIndexOutOfBoundsException {@inheritDoc}
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*/
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@Override
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public StringBuilder insert(int offset, long l) {
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super.insert(offset, l);
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return this;
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}
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/**
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* @throws StringIndexOutOfBoundsException {@inheritDoc}
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*/
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@Override
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public StringBuilder insert(int offset, float f) {
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super.insert(offset, f);
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return this;
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}
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/**
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* @throws StringIndexOutOfBoundsException {@inheritDoc}
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*/
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@Override
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public StringBuilder insert(int offset, double d) {
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super.insert(offset, d);
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return this;
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}
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@Override
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public int indexOf(String str) {
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return super.indexOf(str);
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}
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@Override
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public int indexOf(String str, int fromIndex) {
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return super.indexOf(str, fromIndex);
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}
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@Override
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public int lastIndexOf(String str) {
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return super.lastIndexOf(str);
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}
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@Override
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public int lastIndexOf(String str, int fromIndex) {
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return super.lastIndexOf(str, fromIndex);
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}
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@Override
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public StringBuilder reverse() {
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super.reverse();
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return this;
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}
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@Override
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public String toString() {
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// Create a copy, don't share the array
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return new String(value, 0, count);
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}
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/**
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* Save the state of the {@code StringBuilder} instance to a stream
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* (that is, serialize it).
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*
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* @serialData the number of characters currently stored in the string
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* builder ({@code int}), followed by the characters in the
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* string builder ({@code char[]}). The length of the
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* {@code char} array may be greater than the number of
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* characters currently stored in the string builder, in which
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* case extra characters are ignored.
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*/
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private void writeObject(java.io.ObjectOutputStream s)
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throws java.io.IOException {
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s.defaultWriteObject();
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s.writeInt(count);
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s.writeObject(value);
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}
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/**
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* readObject is called to restore the state of the StringBuffer from
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* a stream.
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*/
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private void readObject(java.io.ObjectInputStream s)
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throws java.io.IOException, ClassNotFoundException {
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s.defaultReadObject();
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count = s.readInt();
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value = (char[]) s.readObject();
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}
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}
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