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489 lines
20 KiB
489 lines
20 KiB
/*
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* Copyright (c) 1996, 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.reflect;
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/**
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* The {@code Array} class provides static methods to dynamically create and
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* access Java arrays.
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*
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* <p>{@code Array} permits widening conversions to occur during a get or set
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* operation, but throws an {@code IllegalArgumentException} if a narrowing
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* conversion would occur.
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*
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* @author Nakul Saraiya
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*/
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public final
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class Array {
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/**
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* Constructor. Class Array is not instantiable.
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*/
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private Array() {}
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/**
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* Creates a new array with the specified component type and
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* length.
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* Invoking this method is equivalent to creating an array
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* as follows:
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* <blockquote>
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* <pre>
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* int[] x = {length};
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* Array.newInstance(componentType, x);
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* </pre>
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* </blockquote>
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*
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* <p>The number of dimensions of the new array must not
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* exceed 255.
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*
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* @param componentType the {@code Class} object representing the
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* component type of the new array
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* @param length the length of the new array
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* @return the new array
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* @exception NullPointerException if the specified
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* {@code componentType} parameter is null
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* @exception IllegalArgumentException if componentType is {@link
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* Void#TYPE} or if the number of dimensions of the requested array
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* instance exceed 255.
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* @exception NegativeArraySizeException if the specified {@code length}
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* is negative
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*/
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public static Object newInstance(Class<?> componentType, int length)
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throws NegativeArraySizeException {
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return newArray(componentType, length);
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}
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/**
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* Creates a new array
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* with the specified component type and dimensions.
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* If {@code componentType}
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* represents a non-array class or interface, the new array
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* has {@code dimensions.length} dimensions and
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* {@code componentType} as its component type. If
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* {@code componentType} represents an array class, the
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* number of dimensions of the new array is equal to the sum
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* of {@code dimensions.length} and the number of
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* dimensions of {@code componentType}. In this case, the
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* component type of the new array is the component type of
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* {@code componentType}.
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*
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* <p>The number of dimensions of the new array must not
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* exceed 255.
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*
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* @param componentType the {@code Class} object representing the component
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* type of the new array
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* @param dimensions an array of {@code int} representing the dimensions of
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* the new array
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* @return the new array
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* @exception NullPointerException if the specified
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* {@code componentType} argument is null
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* @exception IllegalArgumentException if the specified {@code dimensions}
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* argument is a zero-dimensional array, if componentType is {@link
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* Void#TYPE}, or if the number of dimensions of the requested array
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* instance exceed 255.
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* @exception NegativeArraySizeException if any of the components in
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* the specified {@code dimensions} argument is negative.
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*/
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public static Object newInstance(Class<?> componentType, int... dimensions)
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throws IllegalArgumentException, NegativeArraySizeException {
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return multiNewArray(componentType, dimensions);
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}
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/**
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* Returns the length of the specified array object, as an {@code int}.
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*
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* @param array the array
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* @return the length of the array
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* @exception IllegalArgumentException if the object argument is not
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* an array
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*/
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public static native int getLength(Object array)
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throws IllegalArgumentException;
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/**
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* Returns the value of the indexed component in the specified
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* array object. The value is automatically wrapped in an object
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* if it has a primitive type.
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*
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* @param array the array
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* @param index the index
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* @return the (possibly wrapped) value of the indexed component in
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* the specified array
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* @exception NullPointerException If the specified object is null
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* @exception IllegalArgumentException If the specified object is not
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* an array
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* @exception ArrayIndexOutOfBoundsException If the specified {@code index}
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* argument is negative, or if it is greater than or equal to the
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* length of the specified array
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*/
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public static native Object get(Object array, int index)
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throws IllegalArgumentException, ArrayIndexOutOfBoundsException;
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/**
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* Returns the value of the indexed component in the specified
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* array object, as a {@code boolean}.
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*
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* @param array the array
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* @param index the index
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* @return the value of the indexed component in the specified array
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* @exception NullPointerException If the specified object is null
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* @exception IllegalArgumentException If the specified object is not
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* an array, or if the indexed element cannot be converted to the
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* return type by an identity or widening conversion
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* @exception ArrayIndexOutOfBoundsException If the specified {@code index}
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* argument is negative, or if it is greater than or equal to the
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* length of the specified array
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* @see Array#get
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*/
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public static native boolean getBoolean(Object array, int index)
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throws IllegalArgumentException, ArrayIndexOutOfBoundsException;
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/**
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* Returns the value of the indexed component in the specified
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* array object, as a {@code byte}.
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*
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* @param array the array
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* @param index the index
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* @return the value of the indexed component in the specified array
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* @exception NullPointerException If the specified object is null
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* @exception IllegalArgumentException If the specified object is not
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* an array, or if the indexed element cannot be converted to the
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* return type by an identity or widening conversion
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* @exception ArrayIndexOutOfBoundsException If the specified {@code index}
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* argument is negative, or if it is greater than or equal to the
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* length of the specified array
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* @see Array#get
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*/
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public static native byte getByte(Object array, int index)
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throws IllegalArgumentException, ArrayIndexOutOfBoundsException;
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/**
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* Returns the value of the indexed component in the specified
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* array object, as a {@code char}.
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*
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* @param array the array
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* @param index the index
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* @return the value of the indexed component in the specified array
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* @exception NullPointerException If the specified object is null
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* @exception IllegalArgumentException If the specified object is not
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* an array, or if the indexed element cannot be converted to the
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* return type by an identity or widening conversion
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* @exception ArrayIndexOutOfBoundsException If the specified {@code index}
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* argument is negative, or if it is greater than or equal to the
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* length of the specified array
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* @see Array#get
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*/
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public static native char getChar(Object array, int index)
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throws IllegalArgumentException, ArrayIndexOutOfBoundsException;
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/**
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* Returns the value of the indexed component in the specified
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* array object, as a {@code short}.
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*
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* @param array the array
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* @param index the index
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* @return the value of the indexed component in the specified array
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* @exception NullPointerException If the specified object is null
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* @exception IllegalArgumentException If the specified object is not
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* an array, or if the indexed element cannot be converted to the
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* return type by an identity or widening conversion
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* @exception ArrayIndexOutOfBoundsException If the specified {@code index}
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* argument is negative, or if it is greater than or equal to the
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* length of the specified array
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* @see Array#get
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*/
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public static native short getShort(Object array, int index)
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throws IllegalArgumentException, ArrayIndexOutOfBoundsException;
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/**
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* Returns the value of the indexed component in the specified
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* array object, as an {@code int}.
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*
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* @param array the array
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* @param index the index
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* @return the value of the indexed component in the specified array
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* @exception NullPointerException If the specified object is null
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* @exception IllegalArgumentException If the specified object is not
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* an array, or if the indexed element cannot be converted to the
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* return type by an identity or widening conversion
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* @exception ArrayIndexOutOfBoundsException If the specified {@code index}
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* argument is negative, or if it is greater than or equal to the
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* length of the specified array
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* @see Array#get
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*/
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public static native int getInt(Object array, int index)
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throws IllegalArgumentException, ArrayIndexOutOfBoundsException;
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/**
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* Returns the value of the indexed component in the specified
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* array object, as a {@code long}.
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*
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* @param array the array
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* @param index the index
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* @return the value of the indexed component in the specified array
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* @exception NullPointerException If the specified object is null
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* @exception IllegalArgumentException If the specified object is not
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* an array, or if the indexed element cannot be converted to the
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* return type by an identity or widening conversion
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* @exception ArrayIndexOutOfBoundsException If the specified {@code index}
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* argument is negative, or if it is greater than or equal to the
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* length of the specified array
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* @see Array#get
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*/
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public static native long getLong(Object array, int index)
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throws IllegalArgumentException, ArrayIndexOutOfBoundsException;
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/**
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* Returns the value of the indexed component in the specified
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* array object, as a {@code float}.
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*
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* @param array the array
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* @param index the index
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* @return the value of the indexed component in the specified array
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* @exception NullPointerException If the specified object is null
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* @exception IllegalArgumentException If the specified object is not
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* an array, or if the indexed element cannot be converted to the
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* return type by an identity or widening conversion
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* @exception ArrayIndexOutOfBoundsException If the specified {@code index}
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* argument is negative, or if it is greater than or equal to the
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* length of the specified array
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* @see Array#get
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*/
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public static native float getFloat(Object array, int index)
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throws IllegalArgumentException, ArrayIndexOutOfBoundsException;
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/**
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* Returns the value of the indexed component in the specified
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* array object, as a {@code double}.
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*
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* @param array the array
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* @param index the index
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* @return the value of the indexed component in the specified array
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* @exception NullPointerException If the specified object is null
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* @exception IllegalArgumentException If the specified object is not
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* an array, or if the indexed element cannot be converted to the
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* return type by an identity or widening conversion
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* @exception ArrayIndexOutOfBoundsException If the specified {@code index}
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* argument is negative, or if it is greater than or equal to the
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* length of the specified array
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* @see Array#get
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*/
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public static native double getDouble(Object array, int index)
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throws IllegalArgumentException, ArrayIndexOutOfBoundsException;
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/**
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* Sets the value of the indexed component of the specified array
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* object to the specified new value. The new value is first
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* automatically unwrapped if the array has a primitive component
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* type.
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* @param array the array
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* @param index the index into the array
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* @param value the new value of the indexed component
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* @exception NullPointerException If the specified object argument
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* is null
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* @exception IllegalArgumentException If the specified object argument
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* is not an array, or if the array component type is primitive and
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* an unwrapping conversion fails
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* @exception ArrayIndexOutOfBoundsException If the specified {@code index}
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* argument is negative, or if it is greater than or equal to
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* the length of the specified array
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*/
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public static native void set(Object array, int index, Object value)
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throws IllegalArgumentException, ArrayIndexOutOfBoundsException;
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/**
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* Sets the value of the indexed component of the specified array
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* object to the specified {@code boolean} value.
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* @param array the array
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* @param index the index into the array
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* @param z the new value of the indexed component
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* @exception NullPointerException If the specified object argument
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* is null
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* @exception IllegalArgumentException If the specified object argument
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* is not an array, or if the specified value cannot be converted
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* to the underlying array's component type by an identity or a
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* primitive widening conversion
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* @exception ArrayIndexOutOfBoundsException If the specified {@code index}
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* argument is negative, or if it is greater than or equal to
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* the length of the specified array
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* @see Array#set
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*/
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public static native void setBoolean(Object array, int index, boolean z)
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throws IllegalArgumentException, ArrayIndexOutOfBoundsException;
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/**
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* Sets the value of the indexed component of the specified array
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* object to the specified {@code byte} value.
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* @param array the array
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* @param index the index into the array
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* @param b the new value of the indexed component
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* @exception NullPointerException If the specified object argument
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* is null
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* @exception IllegalArgumentException If the specified object argument
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* is not an array, or if the specified value cannot be converted
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* to the underlying array's component type by an identity or a
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* primitive widening conversion
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* @exception ArrayIndexOutOfBoundsException If the specified {@code index}
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* argument is negative, or if it is greater than or equal to
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* the length of the specified array
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* @see Array#set
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*/
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public static native void setByte(Object array, int index, byte b)
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throws IllegalArgumentException, ArrayIndexOutOfBoundsException;
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/**
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* Sets the value of the indexed component of the specified array
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* object to the specified {@code char} value.
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* @param array the array
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* @param index the index into the array
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* @param c the new value of the indexed component
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* @exception NullPointerException If the specified object argument
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* is null
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* @exception IllegalArgumentException If the specified object argument
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* is not an array, or if the specified value cannot be converted
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* to the underlying array's component type by an identity or a
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* primitive widening conversion
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* @exception ArrayIndexOutOfBoundsException If the specified {@code index}
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* argument is negative, or if it is greater than or equal to
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* the length of the specified array
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* @see Array#set
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*/
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public static native void setChar(Object array, int index, char c)
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throws IllegalArgumentException, ArrayIndexOutOfBoundsException;
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/**
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* Sets the value of the indexed component of the specified array
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* object to the specified {@code short} value.
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* @param array the array
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* @param index the index into the array
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* @param s the new value of the indexed component
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* @exception NullPointerException If the specified object argument
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* is null
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* @exception IllegalArgumentException If the specified object argument
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* is not an array, or if the specified value cannot be converted
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* to the underlying array's component type by an identity or a
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* primitive widening conversion
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* @exception ArrayIndexOutOfBoundsException If the specified {@code index}
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* argument is negative, or if it is greater than or equal to
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* the length of the specified array
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* @see Array#set
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*/
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public static native void setShort(Object array, int index, short s)
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throws IllegalArgumentException, ArrayIndexOutOfBoundsException;
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/**
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* Sets the value of the indexed component of the specified array
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* object to the specified {@code int} value.
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* @param array the array
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* @param index the index into the array
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* @param i the new value of the indexed component
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* @exception NullPointerException If the specified object argument
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* is null
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* @exception IllegalArgumentException If the specified object argument
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* is not an array, or if the specified value cannot be converted
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* to the underlying array's component type by an identity or a
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* primitive widening conversion
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* @exception ArrayIndexOutOfBoundsException If the specified {@code index}
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* argument is negative, or if it is greater than or equal to
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* the length of the specified array
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* @see Array#set
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*/
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public static native void setInt(Object array, int index, int i)
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throws IllegalArgumentException, ArrayIndexOutOfBoundsException;
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/**
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* Sets the value of the indexed component of the specified array
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* object to the specified {@code long} value.
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* @param array the array
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* @param index the index into the array
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* @param l the new value of the indexed component
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* @exception NullPointerException If the specified object argument
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* is null
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* @exception IllegalArgumentException If the specified object argument
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* is not an array, or if the specified value cannot be converted
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* to the underlying array's component type by an identity or a
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* primitive widening conversion
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* @exception ArrayIndexOutOfBoundsException If the specified {@code index}
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* argument is negative, or if it is greater than or equal to
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* the length of the specified array
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* @see Array#set
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*/
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public static native void setLong(Object array, int index, long l)
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throws IllegalArgumentException, ArrayIndexOutOfBoundsException;
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/**
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* Sets the value of the indexed component of the specified array
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* object to the specified {@code float} value.
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* @param array the array
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* @param index the index into the array
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* @param f the new value of the indexed component
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* @exception NullPointerException If the specified object argument
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* is null
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* @exception IllegalArgumentException If the specified object argument
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* is not an array, or if the specified value cannot be converted
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* to the underlying array's component type by an identity or a
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* primitive widening conversion
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* @exception ArrayIndexOutOfBoundsException If the specified {@code index}
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* argument is negative, or if it is greater than or equal to
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* the length of the specified array
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* @see Array#set
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*/
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public static native void setFloat(Object array, int index, float f)
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throws IllegalArgumentException, ArrayIndexOutOfBoundsException;
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|
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/**
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* Sets the value of the indexed component of the specified array
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* object to the specified {@code double} value.
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* @param array the array
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* @param index the index into the array
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* @param d the new value of the indexed component
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* @exception NullPointerException If the specified object argument
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* is null
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* @exception IllegalArgumentException If the specified object argument
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* is not an array, or if the specified value cannot be converted
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* to the underlying array's component type by an identity or a
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* primitive widening conversion
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* @exception ArrayIndexOutOfBoundsException If the specified {@code index}
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* argument is negative, or if it is greater than or equal to
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* the length of the specified array
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* @see Array#set
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*/
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public static native void setDouble(Object array, int index, double d)
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throws IllegalArgumentException, ArrayIndexOutOfBoundsException;
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/*
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* Private
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*/
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private static native Object newArray(Class<?> componentType, int length)
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throws NegativeArraySizeException;
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private static native Object multiNewArray(Class<?> componentType,
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int[] dimensions)
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throws IllegalArgumentException, NegativeArraySizeException;
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}
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