/*
* @(#)Array.java 1.21 04/04/20
*
* Copyright 2004 Sun Microsystems, Inc. All rights reserved.
* SUN PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
*/
package java.lang.reflect;
/**
* The <code>Array</code> class provides static methods to dynamically create and
* access Java arrays.
*
* <p><code>Array</code> permits widening conversions to occur during a get or set
* operation, but throws an <code>IllegalArgumentException</code> if a narrowing
* conversion would occur.
*
* @author Nakul Saraiya
*/
public final
class Array {
/**
* Constructor. Class Array is not instantiable.
*/
private Array() {}
/**
* Creates a new array with the specified component type and
* length.
* Invoking this method is equivalent to creating an array
* as follows:
* <blockquote>
* <pre>
* int[] x = {length};
* Array.newInstance(componentType, x);
* </pre>
* </blockquote>
*
* @param componentType the <code>Class</code> object representing the
* component type of the new array
* @param length the length of the new array
* @return the new array
* @exception NullPointerException if the specified
* <code>componentType</code> parameter is null
* @exception IllegalArgumentException if componentType is Void.TYPE
* @exception NegativeArraySizeException if the specified <code>length</code>
* is negative
*/
public static Object newInstance(Class<?> componentType, int length)
throws NegativeArraySizeException {
return newArray(componentType, length);
}
/**
* Creates a new array
* with the specified component type and dimensions.
* If <code>componentType</code>
* represents a non-array class or interface, the new array
* has <code>dimensions.length</code> dimensions and
* <code>componentType </code> as its component type. If
* <code>componentType</code> represents an array class, the
* number of dimensions of the new array is equal to the sum
* of <code>dimensions.length</code> and the number of
* dimensions of <code>componentType</code>. In this case, the
* component type of the new array is the component type of
* <code>componentType</code>.
*
* <p>The number of dimensions of the new array must not
* exceed the number of array dimensions supported by the
* implementation (typically 255).
*
* @param componentType the <code>Class</code> object representing the component
* type of the new array
* @param dimensions an array of <code>int</code> types representing the dimensions of
* the new array
* @return the new array
* @exception NullPointerException if the specified
* <code>componentType</code> argument is null
* @exception IllegalArgumentException if the specified <code>dimensions</code>
* argument is a zero-dimensional array, or if the number of
* requested dimensions exceeds the limit on the number of array dimensions
* supported by the implementation (typically 255), or if componentType
* is Void.TYPE.
* @exception NegativeArraySizeException if any of the components in
* the specified <code>dimensions</code> argument is negative.
*/
public static Object newInstance(Class<?> componentType, int[] dimensions)
throws IllegalArgumentException, NegativeArraySizeException {
return multiNewArray(componentType, dimensions);
}
/**
* Returns the length of the specified array object, as an <code>int</code>.
*
* @param array the array
* @return the length of the array
* @exception IllegalArgumentException if the object argument is not
* an array
*/
public static native int getLength(Object array)
throws IllegalArgumentException;
/**
* Returns the value of the indexed component in the specified
* array object. The value is automatically wrapped in an object
* if it has a primitive type.
*
* @param array the array
* @param index the index
* @return the (possibly wrapped) value of the indexed component in
* the specified array
* @exception NullPointerException If the specified object is null
* @exception IllegalArgumentException If the specified object is not
* an array
* @exception ArrayIndexOutOfBoundsException If the specified <code>index</code>
* argument is negative, or if it is greater than or equal to the
* length of the specified array
*/
public static native Object get(Object array, int index)
throws IllegalArgumentException, ArrayIndexOutOfBoundsException;
/**
* Returns the value of the indexed component in the specified
* array object, as a <code>boolean</code>.
*
* @param array the array
* @param index the index
* @return the value of the indexed component in the specified array
* @exception NullPointerException If the specified object is null
* @exception IllegalArgumentException If the specified object is not
* an array, or if the indexed element cannot be converted to the
* return type by an identity or widening conversion
* @exception ArrayIndexOutOfBoundsException If the specified <code>index</code>
* argument is negative, or if it is greater than or equal to the
* length of the specified array
* @see Array#get
*/
public static native boolean getBoolean(Object array, int index)
throws IllegalArgumentException, ArrayIndexOutOfBoundsException;
/**
* Returns the value of the indexed component in the specified
* array object, as a <code>byte</code>.
*
* @param array the array
* @param index the index
* @return the value of the indexed component in the specified array
* @exception NullPointerException If the specified object is null
* @exception IllegalArgumentException If the specified object is not
* an array, or if the indexed element cannot be converted to the
* return type by an identity or widening conversion
* @exception ArrayIndexOutOfBoundsException If the specified <code>index</code>
* argument is negative, or if it is greater than or equal to the
* length of the specified array
* @see Array#get
*/
public static native byte getByte(Object array, int index)
throws IllegalArgumentException, ArrayIndexOutOfBoundsException;
/**
* Returns the value of the indexed component in the specified
* array object, as a <code>char</code>.
*
* @param array the array
* @param index the index
* @return the value of the indexed component in the specified array
* @exception NullPointerException If the specified object is null
* @exception IllegalArgumentException If the specified object is not
* an array, or if the indexed element cannot be converted to the
* return type by an identity or widening conversion
* @exception ArrayIndexOutOfBoundsException If the specified <code>index</code>
* argument is negative, or if it is greater than or equal to the
* length of the specified array
* @see Array#get
*/
public static native char getChar(Object array, int index)
throws IllegalArgumentException, ArrayIndexOutOfBoundsException;
/**
* Returns the value of the indexed component in the specified
* array object, as a <code>short</code>.
*
* @param array the array
* @param index the index
* @return the value of the indexed component in the specified array
* @exception NullPointerException If the specified object is null
* @exception IllegalArgumentException If the specified object is not
* an array, or if the indexed element cannot be converted to the
* return type by an identity or widening conversion
* @exception ArrayIndexOutOfBoundsException If the specified <code>index</code>
* argument is negative, or if it is greater than or equal to the
* length of the specified array
* @see Array#get
*/
public static native short getShort(Object array, int index)
throws IllegalArgumentException, ArrayIndexOutOfBoundsException;
/**
* Returns the value of the indexed component in the specified
* array object, as an <code>int</code>.
*
* @param array the array
* @param index the index
* @return the value of the indexed component in the specified array
* @exception NullPointerException If the specified object is null
* @exception IllegalArgumentException If the specified object is not
* an array, or if the indexed element cannot be converted to the
* return type by an identity or widening conversion
* @exception ArrayIndexOutOfBoundsException If the specified <code>index</code>
* argument is negative, or if it is greater than or equal to the
* length of the specified array
* @see Array#get
*/
public static native int getInt(Object array, int index)
throws IllegalArgumentException, ArrayIndexOutOfBoundsException;
/**
* Returns the value of the indexed component in the specified
* array object, as a <code>long</code>.
*
* @param array the array
* @param index the index
* @return the value of the indexed component in the specified array
* @exception NullPointerException If the specified object is null
* @exception IllegalArgumentException If the specified object is not
* an array, or if the indexed element cannot be converted to the
* return type by an identity or widening conversion
* @exception ArrayIndexOutOfBoundsException If the specified <code>index</code>
* argument is negative, or if it is greater than or equal to the
* length of the specified array
* @see Array#get
*/
public static native long getLong(Object array, int index)
throws IllegalArgumentException, ArrayIndexOutOfBoundsException;
/**
* Returns the value of the indexed component in the specified
* array object, as a <code>float</code>.
*
* @param array the array
* @param index the index
* @return the value of the indexed component in the specified array
* @exception NullPointerException If the specified object is null
* @exception IllegalArgumentException If the specified object is not
* an array, or if the indexed element cannot be converted to the
* return type by an identity or widening conversion
* @exception ArrayIndexOutOfBoundsException If the specified <code>index</code>
* argument is negative, or if it is greater than or equal to the
* length of the specified array
* @see Array#get
*/
public static native float getFloat(Object array, int index)
throws IllegalArgumentException, ArrayIndexOutOfBoundsException;
/**
* Returns the value of the indexed component in the specified
* array object, as a <code>double</code>.
*
* @param array the array
* @param index the index
* @return the value of the indexed component in the specified array
* @exception NullPointerException If the specified object is null
* @exception IllegalArgumentException If the specified object is not
* an array, or if the indexed element cannot be converted to the
* return type by an identity or widening conversion
* @exception ArrayIndexOutOfBoundsException If the specified <code>index</code>
* argument is negative, or if it is greater than or equal to the
* length of the specified array
* @see Array#get
*/
public static native double getDouble(Object array, int index)
throws IllegalArgumentException, ArrayIndexOutOfBoundsException;
/**
* Sets the value of the indexed component of the specified array
* object to the specified new value. The new value is first
* automatically unwrapped if the array has a primitive component
* type.
* @param array the array
* @param index the index into the array
* @param value the new value of the indexed component
* @exception NullPointerException If the specified object argument
* is null
* @exception IllegalArgumentException If the specified object argument
* is not an array, or if the array component type is primitive and
* an unwrapping conversion fails
* @exception ArrayIndexOutOfBoundsException If the specified <code>index</code>
* argument is negative, or if it is greater than or equal to
* the length of the specified array
*/
public static native void set(Object array, int index, Object value)
throws IllegalArgumentException, ArrayIndexOutOfBoundsException;
/**
* Sets the value of the indexed component of the specified array
* object to the specified <code>boolean</code> value.
* @param array the array
* @param index the index into the array
* @param z the new value of the indexed component
* @exception NullPointerException If the specified object argument
* is null
* @exception IllegalArgumentException If the specified object argument
* is not an array, or if the specified value cannot be converted
* to the underlying array's component type by an identity or a
* primitive widening conversion
* @exception ArrayIndexOutOfBoundsException If the specified <code>index</code>
* argument is negative, or if it is greater than or equal to
* the length of the specified array
* @see Array#set
*/
public static native void setBoolean(Object array, int index, boolean z)
throws IllegalArgumentException, ArrayIndexOutOfBoundsException;
/**
* Sets the value of the indexed component of the specified array
* object to the specified <code>byte</code> value.
* @param array the array
* @param index the index into the array
* @param b the new value of the indexed component
* @exception NullPointerException If the specified object argument
* is null
* @exception IllegalArgumentException If the specified object argument
* is not an array, or if the specified value cannot be converted
* to the underlying array's component type by an identity or a
* primitive widening conversion
* @exception ArrayIndexOutOfBoundsException If the specified <code>index</code>
* argument is negative, or if it is greater than or equal to
* the length of the specified array
* @see Array#set
*/
public static native void setByte(Object array, int index, byte b)
throws IllegalArgumentException, ArrayIndexOutOfBoundsException;
/**
* Sets the value of the indexed component of the specified array
* object to the specified <code>char</code> value.
* @param array the array
* @param index the index into the array
* @param c the new value of the indexed component
* @exception NullPointerException If the specified object argument
* is null
* @exception IllegalArgumentException If the specified object argument
* is not an array, or if the specified value cannot be converted
* to the underlying array's component type by an identity or a
* primitive widening conversion
* @exception ArrayIndexOutOfBoundsException If the specified <code>index</code>
* argument is negative, or if it is greater than or equal to
* the length of the specified array
* @see Array#set
*/
public static native void setChar(Object array, int index, char c)
throws IllegalArgumentException, ArrayIndexOutOfBoundsException;
/**
* Sets the value of the indexed component of the specified array
* object to the specified <code>short</code> value.
* @param array the array
* @param index the index into the array
* @param s the new value of the indexed component
* @exception NullPointerException If the specified object argument
* is null
* @exception IllegalArgumentException If the specified object argument
* is not an array, or if the specified value cannot be converted
* to the underlying array's component type by an identity or a
* primitive widening conversion
* @exception ArrayIndexOutOfBoundsException If the specified <code>index</code>
* argument is negative, or if it is greater than or equal to
* the length of the specified array
* @see Array#set
*/
public static native void setShort(Object array, int index, short s)
throws IllegalArgumentException, ArrayIndexOutOfBoundsException;
/**
* Sets the value of the indexed component of the specified array
* object to the specified <code>int</code> value.
* @param array the array
* @param index the index into the array
* @param i the new value of the indexed component
* @exception NullPointerException If the specified object argument
* is null
* @exception IllegalArgumentException If the specified object argument
* is not an array, or if the specified value cannot be converted
* to the underlying array's component type by an identity or a
* primitive widening conversion
* @exception ArrayIndexOutOfBoundsException If the specified <code>index</code>
* argument is negative, or if it is greater than or equal to
* the length of the specified array
* @see Array#set
*/
public static native void setInt(Object array, int index, int i)
throws IllegalArgumentException, ArrayIndexOutOfBoundsException;
/**
* Sets the value of the indexed component of the specified array
* object to the specified <code>long</code> value.
* @param array the array
* @param index the index into the array
* @param l the new value of the indexed component
* @exception NullPointerException If the specified object argument
* is null
* @exception IllegalArgumentException If the specified object argument
* is not an array, or if the specified value cannot be converted
* to the underlying array's component type by an identity or a
* primitive widening conversion
* @exception ArrayIndexOutOfBoundsException If the specified <code>index</code>
* argument is negative, or if it is greater than or equal to
* the length of the specified array
* @see Array#set
*/
public static native void setLong(Object array, int index, long l)
throws IllegalArgumentException, ArrayIndexOutOfBoundsException;
/**
* Sets the value of the indexed component of the specified array
* object to the specified <code>float</code> value.
* @param array the array
* @param index the index into the array
* @param f the new value of the indexed component
* @exception NullPointerException If the specified object argument
* is null
* @exception IllegalArgumentException If the specified object argument
* is not an array, or if the specified value cannot be converted
* to the underlying array's component type by an identity or a
* primitive widening conversion
* @exception ArrayIndexOutOfBoundsException If the specified <code>index</code>
* argument is negative, or if it is greater than or equal to
* the length of the specified array
* @see Array#set
*/
public static native void setFloat(Object array, int index, float f)
throws IllegalArgumentException, ArrayIndexOutOfBoundsException;
/**
* Sets the value of the indexed component of the specified array
* object to the specified <code>double</code> value.
* @param array the array
* @param index the index into the array
* @param d the new value of the indexed component
* @exception NullPointerException If the specified object argument
* is null
* @exception IllegalArgumentException If the specified object argument
* is not an array, or if the specified value cannot be converted
* to the underlying array's component type by an identity or a
* primitive widening conversion
* @exception ArrayIndexOutOfBoundsException If the specified <code>index</code>
* argument is negative, or if it is greater than or equal to
* the length of the specified array
* @see Array#set
*/
public static native void setDouble(Object array, int index, double d)
throws IllegalArgumentException, ArrayIndexOutOfBoundsException;
/*
* Private
*/
private static native Object newArray(Class componentType, int length)
throws NegativeArraySizeException;
private static native Object multiNewArray(Class componentType,
int[] dimensions)
throws IllegalArgumentException, NegativeArraySizeException;
}
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