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/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/*
* Copyright (C) 2008 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package java.lang.reflect;
/**
* Provides static methods to create and access arrays dynamically.
*/
public final class Array {
private Array() {
}
private static IllegalArgumentException notAnArray(Object o) {
throw new IllegalArgumentException("Not an array: " + o.getClass());
}
private static IllegalArgumentException incompatibleType(Object o) {
throw new IllegalArgumentException("Array has incompatible type: " + o.getClass());
}
private static RuntimeException badArray(Object array) {
if (array == null) {
throw new NullPointerException("array == null");
} else if (!array.getClass().isArray()) {
throw notAnArray(array);
} else {
throw incompatibleType(array);
}
}
/**
* Returns the element of the array at the specified index. Equivalent to {@code array[index]}.
* If the array component is a primitive type, the result is automatically boxed.
*
* @throws NullPointerException if {@code array == null}
* @throws IllegalArgumentException
* if {@code array} is not an array
* @throws ArrayIndexOutOfBoundsException
* if {@code index < 0 || index >= array.length}
*/
public static Object get(Object array, int index) throws IllegalArgumentException, ArrayIndexOutOfBoundsException {
if (array instanceof Object[]) {
return ((Object[]) array)[index];
}
if (array instanceof boolean[]) {
return ((boolean[]) array)[index] ? Boolean.TRUE : Boolean.FALSE;
}
if (array instanceof byte[]) {
return Byte.valueOf(((byte[]) array)[index]);
}
if (array instanceof char[]) {
return Character.valueOf(((char[]) array)[index]);
}
if (array instanceof short[]) {
return Short.valueOf(((short[]) array)[index]);
}
if (array instanceof int[]) {
return Integer.valueOf(((int[]) array)[index]);
}
if (array instanceof long[]) {
return Long.valueOf(((long[]) array)[index]);
}
if (array instanceof float[]) {
return new Float(((float[]) array)[index]);
}
if (array instanceof double[]) {
return new Double(((double[]) array)[index]);
}
if (array == null) {
throw new NullPointerException("array == null");
}
throw notAnArray(array);
}
/**
* Returns the boolean at the given index in the given boolean array.
*
* @throws NullPointerException if {@code array == null}
* @throws IllegalArgumentException
* if {@code array} is not an array or the element at the
* index position can not be converted to the return type
* @throws ArrayIndexOutOfBoundsException
* if {@code index < 0 || index >= array.length}
*/
public static boolean getBoolean(Object array, int index) throws IllegalArgumentException, ArrayIndexOutOfBoundsException {
if (array instanceof boolean[]) {
return ((boolean[]) array)[index];
}
throw badArray(array);
}
/**
* Returns the byte at the given index in the given byte array.
*
* @throws NullPointerException if {@code array == null}
* @throws IllegalArgumentException
* if {@code array} is not an array or the element at the
* index position can not be converted to the return type
* @throws ArrayIndexOutOfBoundsException
* if {@code index < 0 || index >= array.length}
*/
public static byte getByte(Object array, int index) throws IllegalArgumentException, ArrayIndexOutOfBoundsException {
if (array instanceof byte[]) {
return ((byte[]) array)[index];
}
throw badArray(array);
}
/**
* Returns the char at the given index in the given char array.
*
* @throws NullPointerException if {@code array == null}
* @throws IllegalArgumentException
* if {@code array} is not an array or the element at the
* index position can not be converted to the return type
* @throws ArrayIndexOutOfBoundsException
* if {@code index < 0 || index >= array.length}
*/
public static char getChar(Object array, int index) throws IllegalArgumentException, ArrayIndexOutOfBoundsException {
if (array instanceof char[]) {
return ((char[]) array)[index];
}
throw badArray(array);
}
/**
* Returns the double at the given index in the given array.
* Applies to byte, char, float, double, int, long, and short arrays.
*
* @throws NullPointerException if {@code array == null}
* @throws IllegalArgumentException
* if {@code array} is not an array or the element at the
* index position can not be converted to the return type
* @throws ArrayIndexOutOfBoundsException
* if {@code index < 0 || index >= array.length}
*/
public static double getDouble(Object array, int index) throws IllegalArgumentException, ArrayIndexOutOfBoundsException {
if (array instanceof double[]) {
return ((double[]) array)[index];
} else if (array instanceof byte[]) {
return ((byte[]) array)[index];
} else if (array instanceof char[]) {
return ((char[]) array)[index];
} else if (array instanceof float[]) {
return ((float[]) array)[index];
} else if (array instanceof int[]) {
return ((int[]) array)[index];
} else if (array instanceof long[]) {
return ((long[]) array)[index];
} else if (array instanceof short[]) {
return ((short[]) array)[index];
}
throw badArray(array);
}
/**
* Returns the float at the given index in the given array.
* Applies to byte, char, float, int, long, and short arrays.
*
* @throws NullPointerException if {@code array == null}
* @throws IllegalArgumentException
* if {@code array} is not an array or the element at the
* index position can not be converted to the return type
* @throws ArrayIndexOutOfBoundsException
* if {@code index < 0 || index >= array.length}
*/
public static float getFloat(Object array, int index) throws IllegalArgumentException, ArrayIndexOutOfBoundsException {
if (array instanceof float[]) {
return ((float[]) array)[index];
} else if (array instanceof byte[]) {
return ((byte[]) array)[index];
} else if (array instanceof char[]) {
return ((char[]) array)[index];
} else if (array instanceof int[]) {
return ((int[]) array)[index];
} else if (array instanceof long[]) {
return ((long[]) array)[index];
} else if (array instanceof short[]) {
return ((short[]) array)[index];
}
throw badArray(array);
}
/**
* Returns the int at the given index in the given array.
* Applies to byte, char, int, and short arrays.
*
* @throws NullPointerException if {@code array == null}
* @throws IllegalArgumentException
* if {@code array} is not an array or the element at the
* index position can not be converted to the return type
* @throws ArrayIndexOutOfBoundsException
* if {@code index < 0 || index >= array.length}
*/
public static int getInt(Object array, int index) throws IllegalArgumentException, ArrayIndexOutOfBoundsException {
if (array instanceof int[]) {
return ((int[]) array)[index];
} else if (array instanceof byte[]) {
return ((byte[]) array)[index];
} else if (array instanceof char[]) {
return ((char[]) array)[index];
} else if (array instanceof short[]) {
return ((short[]) array)[index];
}
throw badArray(array);
}
/**
* Returns the length of the array. Equivalent to {@code array.length}.
*
* @throws NullPointerException if {@code array == null}
* @throws IllegalArgumentException
* if {@code array} is not an array
*/
public static int getLength(Object array) {
if (array instanceof Object[]) {
return ((Object[]) array).length;
} else if (array instanceof boolean[]) {
return ((boolean[]) array).length;
} else if (array instanceof byte[]) {
return ((byte[]) array).length;
} else if (array instanceof char[]) {
return ((char[]) array).length;
} else if (array instanceof double[]) {
return ((double[]) array).length;
} else if (array instanceof float[]) {
return ((float[]) array).length;
} else if (array instanceof int[]) {
return ((int[]) array).length;
} else if (array instanceof long[]) {
return ((long[]) array).length;
} else if (array instanceof short[]) {
return ((short[]) array).length;
}
throw badArray(array);
}
/**
* Returns the long at the given index in the given array.
* Applies to byte, char, int, long, and short arrays.
*
* @throws NullPointerException if {@code array == null}
* @throws IllegalArgumentException
* if {@code array} is not an array or the element at the
* index position can not be converted to the return type
* @throws ArrayIndexOutOfBoundsException
* if {@code index < 0 || index >= array.length}
*/
public static long getLong(Object array, int index) throws IllegalArgumentException, ArrayIndexOutOfBoundsException {
if (array instanceof long[]) {
return ((long[]) array)[index];
} else if (array instanceof byte[]) {
return ((byte[]) array)[index];
} else if (array instanceof char[]) {
return ((char[]) array)[index];
} else if (array instanceof int[]) {
return ((int[]) array)[index];
} else if (array instanceof short[]) {
return ((short[]) array)[index];
}
throw badArray(array);
}
/**
* Returns the short at the given index in the given array.
* Applies to byte and short arrays.
*
* @throws NullPointerException if {@code array == null}
* @throws IllegalArgumentException
* if {@code array} is not an array or the element at the
* index position can not be converted to the return type
* @throws ArrayIndexOutOfBoundsException
* if {@code index < 0 || index >= array.length}
*/
public static short getShort(Object array, int index) throws IllegalArgumentException, ArrayIndexOutOfBoundsException {
if (array instanceof short[]) {
return ((short[]) array)[index];
} else if (array instanceof byte[]) {
return ((byte[]) array)[index];
}
throw badArray(array);
}
/**
* Returns a new multidimensional array of the specified component type and
* dimensions. Equivalent to {@code new componentType[d0][d1]...[dn]} for a
* dimensions array of { d0, d1, ... , dn }.
*
* @throws NullPointerException if {@code array == null}
* @throws NegativeArraySizeException
* if any of the dimensions are negative
* @throws IllegalArgumentException
* if the array of dimensions is of size zero, or exceeds the
* limit of the number of dimension for an array (currently 255)
*/
public static Object newInstance(Class componentType, int... dimensions) throws NegativeArraySizeException, IllegalArgumentException {
if (dimensions.length <= 0 || dimensions.length > 255) {
throw new IllegalArgumentException("Bad number of dimensions: " + dimensions.length);
}
if (componentType == void.class) {
throw new IllegalArgumentException("Can't allocate an array of void");
}
if (componentType == null) {
throw new NullPointerException("componentType == null");
}
return createMultiArray(componentType, dimensions);
}
/*
* Create a multi-dimensional array of objects with the specified type.
*/
private static native Object createMultiArray(Class componentType, int[] dimensions) throws NegativeArraySizeException;
/**
* Returns a new array of the specified component type and length.
* Equivalent to {@code new componentType[size]}.
*
* @throws NullPointerException
* if the component type is null
* @throws NegativeArraySizeException
* if {@code size < 0}
*/
public static Object newInstance(Class componentType, int size) throws NegativeArraySizeException {
if (!componentType.isPrimitive()) {
return createObjectArray(componentType, size);
} else if (componentType == boolean.class) {
return new boolean[size];
} else if (componentType == byte.class) {
return new byte[size];
} else if (componentType == char.class) {
return new char[size];
} else if (componentType == short.class) {
return new short[size];
} else if (componentType == int.class) {
return new int[size];
} else if (componentType == long.class) {
return new long[size];
} else if (componentType == float.class) {
return new float[size];
} else if (componentType == double.class) {
return new double[size];
} else if (componentType == void.class) {
throw new IllegalArgumentException("Can't allocate an array of void");
}
throw new AssertionError();
}
/*
* Create a one-dimensional array of objects with the specified type.
*/
private static native Object createObjectArray(Class componentType, int length) throws NegativeArraySizeException;
/**
* Sets the element of the array at the specified index to the value.
* Equivalent to {@code array[index] = value}. If the array
* component is a primitive type, the value is automatically unboxed.
*
* @throws NullPointerException if {@code array == null}
* @throws IllegalArgumentException
* if {@code array} is not an array or the value cannot be
* converted to the array type by a widening conversion
* @throws ArrayIndexOutOfBoundsException
* if {@code index < 0 || index >= array.length}
*/
public static void set(Object array, int index, Object value) throws IllegalArgumentException, ArrayIndexOutOfBoundsException {
if (!array.getClass().isArray()) {
throw notAnArray(array);
}
if (array instanceof Object[]) {
if (value != null && !array.getClass().getComponentType().isInstance(value)) {
throw incompatibleType(array);
}
((Object[]) array)[index] = value;
} else {
if (value == null) {
throw new IllegalArgumentException("Primitive array can't take null values.");
}
if (value instanceof Boolean) {
setBoolean(array, index, ((Boolean) value).booleanValue());
} else if (value instanceof Byte) {
setByte(array, index, ((Byte) value).byteValue());
} else if (value instanceof Character) {
setChar(array, index, ((Character) value).charValue());
} else if (value instanceof Short) {
setShort(array, index, ((Short) value).shortValue());
} else if (value instanceof Integer) {
setInt(array, index, ((Integer) value).intValue());
} else if (value instanceof Long) {
setLong(array, index, ((Long) value).longValue());
} else if (value instanceof Float) {
setFloat(array, index, ((Float) value).floatValue());
} else if (value instanceof Double) {
setDouble(array, index, ((Double) value).doubleValue());
}
}
}
/**
* Sets {@code array[index] = value}. Applies to boolean arrays.
*
* @throws NullPointerException if {@code array == null}
* @throws IllegalArgumentException
* if the {@code array} is not an array or the value cannot be
* converted to the array type by a widening conversion
* @throws ArrayIndexOutOfBoundsException
* if {@code index < 0 || index >= array.length}
*/
public static void setBoolean(Object array, int index, boolean value) {
if (array instanceof boolean[]) {
((boolean[]) array)[index] = value;
} else {
throw badArray(array);
}
}
/**
* Sets {@code array[index] = value}. Applies to byte, double, float, int, long, and short arrays.
*
* @throws NullPointerException if {@code array == null}
* @throws IllegalArgumentException
* if the {@code array} is not an array or the value cannot be
* converted to the array type by a widening conversion
* @throws ArrayIndexOutOfBoundsException
* if {@code index < 0 || index >= array.length}
*/
public static void setByte(Object array, int index, byte value) throws IllegalArgumentException, ArrayIndexOutOfBoundsException {
if (array instanceof byte[]) {
((byte[]) array)[index] = value;
} else if (array instanceof double[]) {
((double[]) array)[index] = value;
} else if (array instanceof float[]) {
((float[]) array)[index] = value;
} else if (array instanceof int[]) {
((int[]) array)[index] = value;
} else if (array instanceof long[]) {
((long[]) array)[index] = value;
} else if (array instanceof short[]) {
((short[]) array)[index] = value;
} else {
throw badArray(array);
}
}
/**
* Sets {@code array[index] = value}. Applies to char, double, float, int, and long arrays.
*
* @throws NullPointerException if {@code array == null}
* @throws IllegalArgumentException
* if the {@code array} is not an array or the value cannot be
* converted to the array type by a widening conversion
* @throws ArrayIndexOutOfBoundsException
* if {@code index < 0 || index >= array.length}
*/
public static void setChar(Object array, int index, char value) throws IllegalArgumentException, ArrayIndexOutOfBoundsException {
if (array instanceof char[]) {
((char[]) array)[index] = value;
} else if (array instanceof double[]) {
((double[]) array)[index] = value;
} else if (array instanceof float[]) {
((float[]) array)[index] = value;
} else if (array instanceof int[]) {
((int[]) array)[index] = value;
} else if (array instanceof long[]) {
((long[]) array)[index] = value;
} else {
throw badArray(array);
}
}
/**
* Sets {@code array[index] = value}. Applies to double arrays.
*
* @throws NullPointerException if {@code array == null}
* @throws IllegalArgumentException
* if the {@code array} is not an array or the value cannot be
* converted to the array type by a widening conversion
* @throws ArrayIndexOutOfBoundsException
* if {@code index < 0 || index >= array.length}
*/
public static void setDouble(Object array, int index, double value) throws IllegalArgumentException, ArrayIndexOutOfBoundsException {
if (array instanceof double[]) {
((double[]) array)[index] = value;
} else {
throw badArray(array);
}
}
/**
* Sets {@code array[index] = value}. Applies to double and float arrays.
*
* @throws NullPointerException if {@code array == null}
* @throws IllegalArgumentException
* if the {@code array} is not an array or the value cannot be
* converted to the array type by a widening conversion
* @throws ArrayIndexOutOfBoundsException
* if {@code index < 0 || index >= array.length}
*/
public static void setFloat(Object array, int index, float value) throws IllegalArgumentException, ArrayIndexOutOfBoundsException {
if (array instanceof float[]) {
((float[]) array)[index] = value;
} else if (array instanceof double[]) {
((double[]) array)[index] = value;
} else {
throw badArray(array);
}
}
/**
* Sets {@code array[index] = value}. Applies to double, float, int, and long arrays.
*
* @throws NullPointerException if {@code array == null}
* @throws IllegalArgumentException
* if the {@code array} is not an array or the value cannot be
* converted to the array type by a widening conversion
* @throws ArrayIndexOutOfBoundsException
* if {@code index < 0 || index >= array.length}
*/
public static void setInt(Object array, int index, int value) throws IllegalArgumentException, ArrayIndexOutOfBoundsException {
if (array instanceof int[]) {
((int[]) array)[index] = value;
} else if (array instanceof double[]) {
((double[]) array)[index] = value;
} else if (array instanceof float[]) {
((float[]) array)[index] = value;
} else if (array instanceof long[]) {
((long[]) array)[index] = value;
} else {
throw badArray(array);
}
}
/**
* Sets {@code array[index] = value}. Applies to double, float, and long arrays.
*
* @throws NullPointerException if {@code array == null}
* @throws IllegalArgumentException
* if the {@code array} is not an array or the value cannot be
* converted to the array type by a widening conversion
* @throws ArrayIndexOutOfBoundsException
* if {@code index < 0 || index >= array.length}
*/
public static void setLong(Object array, int index, long value) throws IllegalArgumentException, ArrayIndexOutOfBoundsException {
if (array instanceof long[]) {
((long[]) array)[index] = value;
} else if (array instanceof double[]) {
((double[]) array)[index] = value;
} else if (array instanceof float[]) {
((float[]) array)[index] = value;
} else {
throw badArray(array);
}
}
/**
* Sets {@code array[index] = value}. Applies to double, float, int, long, and short arrays.
*
* @throws NullPointerException if {@code array == null}
* @throws IllegalArgumentException
* if the {@code array} is not an array or the value cannot be
* converted to the array type by a widening conversion
* @throws ArrayIndexOutOfBoundsException
* if {@code index < 0 || index >= array.length}
*/
public static void setShort(Object array, int index, short value) throws IllegalArgumentException, ArrayIndexOutOfBoundsException {
if (array instanceof short[]) {
((short[]) array)[index] = value;
} else if (array instanceof double[]) {
((double[]) array)[index] = value;
} else if (array instanceof float[]) {
((float[]) array)[index] = value;
} else if (array instanceof int[]) {
((int[]) array)[index] = value;
} else if (array instanceof long[]) {
((long[]) array)[index] = value;
} else {
throw badArray(array);
}
}
}
