| /* |
| * 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; |
| |
| /** |
| * This class provides static methods to create and access arrays dynamically. |
| */ |
| public final class Array { |
| |
| /** |
| * Prevent this class from being instantiated. |
| */ |
| private Array(){ |
| //do nothing |
| } |
| |
| /** |
| * Returns the element of the array at the specified index. This reproduces |
| * the effect of {@code array[index]}. If the array component is a primitive |
| * type, the result is automatically boxed. |
| * |
| * @param array |
| * the array |
| * @param index |
| * the index |
| * |
| * @return the requested element, possibly boxed |
| * |
| * @throws NullPointerException |
| * if the array is 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(); |
| |
| throw new IllegalArgumentException("Not an array"); |
| } |
| |
| /** |
| * Returns the element of the array at the specified index, converted to a |
| * {@code boolean}, if possible. This reproduces the effect of {@code |
| * array[index]} |
| * |
| * @param array |
| * the array |
| * @param index |
| * the index |
| * |
| * @return the requested element |
| * |
| * @throws NullPointerException |
| * if the {@code array} is {@code 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]; |
| } else if (array == null) { |
| throw new NullPointerException(); |
| } else if (array.getClass().isArray()) { |
| throw new IllegalArgumentException("Wrong array type"); |
| } else { |
| throw new IllegalArgumentException("Not an array"); |
| } |
| } |
| |
| /** |
| * Returns the element of the array at the specified index, converted to a |
| * {@code byte}, if possible. This reproduces the effect of {@code |
| * array[index]} |
| * |
| * @param array |
| * the array |
| * @param index |
| * the index |
| * |
| * @return the requested element |
| * |
| * @throws NullPointerException |
| * if the {@code array} is {@code 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]; |
| } else { |
| return getBoolean(array, index) ? (byte)1 : (byte)0; |
| } |
| } |
| |
| /** |
| * Returns the element of the array at the specified index, converted to a |
| * {@code char}, if possible. This reproduces the effect of {@code |
| * array[index]} |
| * |
| * @param array |
| * the array |
| * @param index |
| * the index |
| * |
| * @return the requested element |
| * |
| * @throws NullPointerException |
| * if the {@code array} is {@code 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]; |
| } else if (array == null) { |
| throw new NullPointerException(); |
| } else if (array.getClass().isArray()) { |
| throw new IllegalArgumentException("Wrong array type"); |
| } else { |
| throw new IllegalArgumentException("Not an array"); |
| } |
| } |
| |
| /** |
| * Returns the element of the array at the specified index, converted to a |
| * {@code double}, if possible. This reproduces the effect of {@code |
| * array[index]} |
| * |
| * @param array |
| * the array |
| * @param index |
| * the index |
| * |
| * @return the requested element |
| * |
| * @throws NullPointerException |
| * if the {@code array} is {@code 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 { |
| return getFloat(array, index); |
| } |
| } |
| |
| /** |
| * Returns the element of the array at the specified index, converted to a |
| * {@code float}, if possible. This reproduces the effect of {@code |
| * array[index]} |
| * |
| * @param array |
| * the array |
| * @param index |
| * the index |
| * |
| * @return the requested element |
| * |
| * @throws NullPointerException |
| * if the {@code array} is {@code 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 { |
| return getLong(array, index); |
| } |
| } |
| |
| /** |
| * Returns the element of the array at the specified index, converted to an |
| * {@code int}, if possible. This reproduces the effect of {@code |
| * array[index]} |
| * |
| * @param array |
| * the array |
| * @param index |
| * the index |
| * |
| * @return the requested element |
| * |
| * @throws NullPointerException |
| * if the {@code array} is {@code 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 { |
| return getShort(array, index); |
| } |
| } |
| |
| /** |
| * Returns the length of the array. This reproduces the effect of {@code |
| * array.length} |
| * |
| * @param array |
| * the array |
| * |
| * @return the length of the array |
| * |
| * @throws NullPointerException |
| * if the {@code array} is {@code null} |
| * @throws IllegalArgumentException |
| * if {@code array} is not an array |
| */ |
| public static int getLength(Object array) { |
| if (array instanceof Object[]) |
| return ((Object[]) array).length; |
| |
| if (array instanceof boolean[]) |
| return ((boolean[]) array).length; |
| |
| if (array instanceof byte[]) |
| return ((byte[]) array).length; |
| |
| if (array instanceof char[]) |
| return ((char[]) array).length; |
| |
| if (array instanceof short[]) |
| return ((short[]) array).length; |
| |
| if (array instanceof int[]) |
| return ((int[]) array).length; |
| |
| if (array instanceof long[]) |
| return ((long[]) array).length; |
| |
| if (array instanceof float[]) |
| return ((float[]) array).length; |
| |
| if (array instanceof double[]) |
| return ((double[]) array).length; |
| |
| if (array == null) |
| throw new NullPointerException(); |
| |
| throw new IllegalArgumentException("Not an array"); |
| } |
| |
| /** |
| * Returns the element of the array at the specified index, converted to a |
| * {@code long}, if possible. This reproduces the effect of {@code |
| * array[index]} |
| * |
| * @param array |
| * the array |
| * @param index |
| * the index |
| * |
| * @return the requested element |
| * |
| * @throws NullPointerException |
| * if the {@code array} is {@code 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 { |
| return getInt(array, index); |
| } |
| } |
| |
| /** |
| * Returns the element of the array at the specified index, converted to a |
| * {@code short}, if possible. This reproduces the effect of {@code |
| * array[index]} |
| * |
| * @param array |
| * the array |
| * @param index |
| * the index |
| * |
| * @return the requested element |
| * |
| * @throws NullPointerException |
| * if the {@code array} is {@code 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]; |
| |
| return getByte(array, index); |
| } |
| |
| /** |
| * Returns a new multidimensional array of the specified component type and |
| * dimensions. This reproduces the effect of {@code new |
| * componentType[d0][d1]...[dn]} for a dimensions array of { d0, d1, ... , |
| * dn }. |
| * |
| * @param componentType |
| * the component type of the new array |
| * @param dimensions |
| * the dimensions of the new array |
| * |
| * @return the new array |
| * |
| * @throws NullPointerException |
| * if the component type is {@code 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"); |
| |
| if (componentType == void.class) |
| throw new IllegalArgumentException(); |
| |
| if (componentType == null) |
| throw new NullPointerException(); |
| |
| return createMultiArray(componentType, dimensions); |
| } |
| |
| /* |
| * Create a multi-dimensional array of objects with the specified type. |
| */ |
| native private static Object createMultiArray(Class<?> componentType, |
| int[] dimensions) throws NegativeArraySizeException; |
| |
| /** |
| * Returns a new array of the specified component type and length. This |
| * reproduces the effect of {@code new componentType[size]}. |
| * |
| * @param componentType |
| * the component type of the new array |
| * @param size |
| * the length of the new array |
| * |
| * @return the new array |
| * |
| * @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); |
| } |
| if (componentType == boolean.class) { |
| return new boolean[size]; |
| } |
| if (componentType == byte.class) { |
| return new byte[size]; |
| } |
| if (componentType == char.class) { |
| return new char[size]; |
| } |
| if (componentType == short.class) { |
| return new short[size]; |
| } |
| if (componentType == int.class) { |
| return new int[size]; |
| } |
| if (componentType == long.class) { |
| return new long[size]; |
| } |
| if (componentType == float.class) { |
| return new float[size]; |
| } |
| if (componentType == double.class) { |
| return new double[size]; |
| } |
| if (componentType == void.class) { |
| throw new IllegalArgumentException(); |
| } |
| throw new AssertionError(); |
| } |
| |
| /* |
| * Create a one-dimensional array of objects with the specified type. |
| */ |
| native private static Object createObjectArray(Class<?> componentType, |
| int length) throws NegativeArraySizeException; |
| |
| /** |
| * Sets the element of the array at the specified index to the value. This |
| * reproduces the effect of {@code array[index] = value}. If the array |
| * component is a primitive type, the value is automatically unboxed. |
| * |
| * @param array |
| * the array |
| * @param index |
| * the index |
| * @param value |
| * the new value |
| * |
| * @throws NullPointerException |
| * if the {@code array} is {@code 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 new IllegalArgumentException("Not an array type"); |
| } |
| |
| if (array instanceof Object[]) { |
| if (value != null && |
| !array.getClass().getComponentType().isInstance(value)) { |
| // incompatible object type for this array |
| throw new IllegalArgumentException("Wrong array type"); |
| } |
| |
| ((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 the element of the array at the specified index to the {@code |
| * boolean} value. This reproduces the effect of {@code array[index] = |
| * value}. |
| * |
| * @param array |
| * the array |
| * @param index |
| * the index |
| * @param value |
| * the new value |
| * |
| * @throws NullPointerException |
| * if the {@code array} is {@code 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 { |
| setByte(array, index, value ? (byte)1 : (byte)0); |
| } |
| } |
| |
| /** |
| * Sets the element of the array at the specified index to the {@code byte} |
| * value. This reproduces the effect of {@code array[index] = value}. |
| * |
| * @param array |
| * the array |
| * @param index |
| * the index |
| * @param value |
| * the new value |
| * |
| * @throws NullPointerException |
| * if the {@code array} is {@code 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 { |
| setShort(array, index, value); |
| } |
| } |
| |
| /** |
| * Set the element of the array at the specified index to the {@code char} |
| * value. This reproduces the effect of {@code array[index] = value}. |
| * |
| * @param array |
| * the array |
| * @param index |
| * the index |
| * @param value |
| * the new value |
| * |
| * @throws NullPointerException |
| * if the {@code array} is {@code 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 == null) { |
| throw new NullPointerException(); |
| } else if (!array.getClass().isArray()) { |
| throw new IllegalArgumentException("Not an array"); |
| } else { |
| throw new IllegalArgumentException("Wrong array type"); |
| } |
| } |
| |
| /** |
| * Set the element of the array at the specified index to the {@code double} |
| * value. This reproduces the effect of {@code array[index] = value}. |
| * |
| * @param array |
| * the array |
| * @param index |
| * the index |
| * @param value |
| * the new value |
| * |
| * @throws NullPointerException |
| * if the {@code array} is {@code 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 if (array == null) { |
| throw new NullPointerException(); |
| } else if (!array.getClass().isArray()) { |
| throw new IllegalArgumentException("Not an array"); |
| } else { |
| throw new IllegalArgumentException("Wrong array type"); |
| } |
| } |
| |
| /** |
| * Set the element of the array at the specified index to the {@code float} |
| * value. This reproduces the effect of {@code array[index] = value}. |
| * |
| * @param array |
| * the array |
| * @param index |
| * the index |
| * @param value |
| * the new value |
| * |
| * @throws NullPointerException |
| * if the {@code array} is {@code 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 { |
| setDouble(array, index, value); |
| } |
| } |
| |
| /** |
| * Set the element of the array at the specified index to the {@code int} |
| * value. This reproduces the effect of {@code array[index] = value}. |
| * |
| * @param array |
| * the array |
| * @param index |
| * the index |
| * @param value |
| * the new value |
| * |
| * @throws NullPointerException |
| * if the {@code array} is {@code 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 { |
| setLong(array, index, value); |
| } |
| } |
| |
| /** |
| * Set the element of the array at the specified index to the {@code long} |
| * value. This reproduces the effect of {@code array[index] = value}. |
| * |
| * @param array |
| * the array |
| * @param index |
| * the index |
| * @param value |
| * the new value |
| * |
| * @throws NullPointerException |
| * if the {@code array} is {@code 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 { |
| setFloat(array, index, value); |
| } |
| } |
| |
| /** |
| * Set the element of the array at the specified index to the {@code short} |
| * value. This reproduces the effect of {@code array[index] = value}. |
| * |
| * @param array |
| * the array |
| * @param index |
| * the index |
| * @param value |
| * the new value |
| * |
| * @throws NullPointerException |
| * if the {@code array} is {@code 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 { |
| setInt(array, index, value); |
| } |
| } |
| |
| } |
