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author | upstream source tree <ports@midipix.org> | 2015-03-15 20:14:05 -0400 |
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committer | upstream source tree <ports@midipix.org> | 2015-03-15 20:14:05 -0400 |
commit | 554fd8c5195424bdbcabf5de30fdc183aba391bd (patch) | |
tree | 976dc5ab7fddf506dadce60ae936f43f58787092 /libjava/classpath/java/lang/reflect/Array.java | |
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Diffstat (limited to 'libjava/classpath/java/lang/reflect/Array.java')
-rw-r--r-- | libjava/classpath/java/lang/reflect/Array.java | 655 |
1 files changed, 655 insertions, 0 deletions
diff --git a/libjava/classpath/java/lang/reflect/Array.java b/libjava/classpath/java/lang/reflect/Array.java new file mode 100644 index 000000000..a31e48ea6 --- /dev/null +++ b/libjava/classpath/java/lang/reflect/Array.java @@ -0,0 +1,655 @@ +/* java.lang.reflect.Array - manipulate arrays by reflection + Copyright (C) 1998, 1999, 2001, 2003, 2005 Free Software Foundation, Inc. + +This file is part of GNU Classpath. + +GNU Classpath is free software; you can redistribute it and/or modify +it under the terms of the GNU General Public License as published by +the Free Software Foundation; either version 2, or (at your option) +any later version. + +GNU Classpath is distributed in the hope that it will be useful, but +WITHOUT ANY WARRANTY; without even the implied warranty of +MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU +General Public License for more details. + +You should have received a copy of the GNU General Public License +along with GNU Classpath; see the file COPYING. If not, write to the +Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA +02110-1301 USA. + +Linking this library statically or dynamically with other modules is +making a combined work based on this library. Thus, the terms and +conditions of the GNU General Public License cover the whole +combination. + +As a special exception, the copyright holders of this library give you +permission to link this library with independent modules to produce an +executable, regardless of the license terms of these independent +modules, and to copy and distribute the resulting executable under +terms of your choice, provided that you also meet, for each linked +independent module, the terms and conditions of the license of that +module. An independent module is a module which is not derived from +or based on this library. If you modify this library, you may extend +this exception to your version of the library, but you are not +obligated to do so. If you do not wish to do so, delete this +exception statement from your version. */ + + +package java.lang.reflect; + +/** + * Array holds static helper functions that allow you to create and + * manipulate arrays by reflection. Operations know how to perform widening + * conversions, but throw {@link IllegalArgumentException} if you attempt + * a narrowing conversion. Also, when accessing primitive arrays, this + * class performs object wrapping and unwrapping as necessary.<p> + * + * <B>Note:</B> This class returns and accepts types as Classes, even + * primitive types; there are Class types defined that represent each + * different primitive type. They are <code>java.lang.Boolean.TYPE, + * java.lang.Byte.TYPE,</code>, also available as <code>boolean.class, + * byte.class</code>, etc. These are not to be confused with the + * classes <code>java.lang.Boolean, java.lang.Byte</code>, etc., which are + * real classes. Note also that the shorthand <code>Object[].class</code> + * is a convenient way to get array Classes.<p> + * + * <B>Performance note:</B> This class performs best when it does not have + * to convert primitive types. The further along the chain it has to convert, + * the worse performance will be. You're best off using the array as whatever + * type it already is, and then converting the result. You will do even + * worse if you do this and use the generic set() function. + * + * @author John Keiser + * @author Eric Blake (ebb9@email.byu.edu) + * @author Per Bothner (bothner@cygnus.com) + * @see java.lang.Boolean#TYPE + * @see java.lang.Byte#TYPE + * @see java.lang.Short#TYPE + * @see java.lang.Character#TYPE + * @see java.lang.Integer#TYPE + * @see java.lang.Long#TYPE + * @see java.lang.Float#TYPE + * @see java.lang.Double#TYPE + * @since 1.1 + * @status updated to 1.4 + */ +public final class Array +{ + + /** + * This class is uninstantiable. + */ + private Array() + { + } + + /** + * Creates a new single-dimensioned array. + * @param componentType the type of the array to create + * @param length the length of the array to create + * @return the created array, cast to an Object + * @throws NullPointerException if <code>componentType</code> is null + * @throws IllegalArgumentException if <code>componentType</code> is + * <code>Void.TYPE</code> + * @throws NegativeArraySizeException when length is less than 0 + * @throws OutOfMemoryError if memory allocation fails + */ + public static Object newInstance(Class<?> componentType, int length) + { + if (! componentType.isPrimitive()) + return VMArray.createObjectArray(componentType, length); + if (componentType == boolean.class) + return new boolean[length]; + if (componentType == byte.class) + return new byte[length]; + if (componentType == char.class) + return new char[length]; + if (componentType == short.class) + return new short[length]; + if (componentType == int.class) + return new int[length]; + if (componentType == long.class) + return new long[length]; + if (componentType == float.class) + return new float[length]; + if (componentType == double.class) + return new double[length]; + // assert componentType == void.class + throw new IllegalArgumentException(); + } + + /** + * Creates a new multi-dimensioned array. The new array has the same + * component type as the argument class, and the number of dimensions + * in the new array is the sum of the dimensions of the argument class + * and the length of the argument dimensions. Virtual Machine limitations + * forbid too many dimensions (usually 255 is the maximum); but even + * 50 dimensions of 2 elements in each dimension would exceed your memory + * long beforehand! + * + * @param componentType the type of the array to create. + * @param dimensions the dimensions of the array to create. Each element + * in <code>dimensions</code> makes another dimension of the new + * array. Thus, <code>Array.newInstance(java.lang.Boolean, + * new int[]{1,2,3})</code> is the same as + * <code>new java.lang.Boolean[1][2][3]</code> + * @return the created array, cast to an Object + * @throws NullPointerException if componentType or dimension is null + * @throws IllegalArgumentException if the the size of + * <code>dimensions</code> is 0 or exceeds the maximum number of + * array dimensions in the VM; or if componentType is Void.TYPE + * @throws NegativeArraySizeException when any of the dimensions is less + * than 0 + * @throws OutOfMemoryError if memory allocation fails + */ + public static Object newInstance(Class<?> componentType, int[] dimensions) + { + if (dimensions.length <= 0) + throw new IllegalArgumentException ("Empty dimensions array."); + return createMultiArray(componentType, dimensions, 0); + } + + /** + * Gets the array length. + * @param array the array + * @return the length of the array + * @throws IllegalArgumentException if <code>array</code> is not an array + * @throws NullPointerException if <code>array</code> is null + */ + 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(); + } + + /** + * Gets an element of an array. Primitive elements will be wrapped in + * the corresponding class type. + * + * @param array the array to access + * @param index the array index to access + * @return the element at <code>array[index]</code> + * @throws IllegalArgumentException if <code>array</code> is not an array + * @throws NullPointerException if <code>array</code> is null + * @throws ArrayIndexOutOfBoundsException if <code>index</code> is out of + * bounds + * @see #getBoolean(Object, int) + * @see #getByte(Object, int) + * @see #getChar(Object, int) + * @see #getShort(Object, int) + * @see #getInt(Object, int) + * @see #getLong(Object, int) + * @see #getFloat(Object, int) + * @see #getDouble(Object, int) + */ + public static Object get(Object array, int index) + { + 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 Float.valueOf(((float[]) array)[index]); + if (array instanceof double[]) + return Double.valueOf(((double[]) array)[index]); + if (array == null) + throw new NullPointerException(); + throw new IllegalArgumentException(); + } + + /** + * Gets an element of a boolean array. + * + * @param array the array to access + * @param index the array index to access + * @return the boolean element at <code>array[index]</code> + * @throws IllegalArgumentException if <code>array</code> is not a boolean + * array + * @throws NullPointerException if <code>array</code> is null + * @throws ArrayIndexOutOfBoundsException if <code>index</code> is out of + * bounds + * @see #get(Object, int) + */ + public static boolean getBoolean(Object array, int index) + { + if (array instanceof boolean[]) + return ((boolean[]) array)[index]; + if (array == null) + throw new NullPointerException(); + throw new IllegalArgumentException(); + } + + /** + * Gets an element of a byte array. + * + * @param array the array to access + * @param index the array index to access + * @return the byte element at <code>array[index]</code> + * @throws IllegalArgumentException if <code>array</code> is not a byte + * array + * @throws NullPointerException if <code>array</code> is null + * @throws ArrayIndexOutOfBoundsException if <code>index</code> is out of + * bounds + * @see #get(Object, int) + */ + public static byte getByte(Object array, int index) + { + if (array instanceof byte[]) + return ((byte[]) array)[index]; + if (array == null) + throw new NullPointerException(); + throw new IllegalArgumentException(); + } + + /** + * Gets an element of a char array. + * + * @param array the array to access + * @param index the array index to access + * @return the char element at <code>array[index]</code> + * @throws IllegalArgumentException if <code>array</code> is not a char + * array + * @throws NullPointerException if <code>array</code> is null + * @throws ArrayIndexOutOfBoundsException if <code>index</code> is out of + * bounds + * @see #get(Object, int) + */ + public static char getChar(Object array, int index) + { + if (array instanceof char[]) + return ((char[]) array)[index]; + if (array == null) + throw new NullPointerException(); + throw new IllegalArgumentException(); + } + + /** + * Gets an element of a short array. + * + * @param array the array to access + * @param index the array index to access + * @return the short element at <code>array[index]</code> + * @throws IllegalArgumentException if <code>array</code> is not a byte + * or char array + * @throws NullPointerException if <code>array</code> is null + * @throws ArrayIndexOutOfBoundsException if <code>index</code> is out of + * bounds + * @see #get(Object, int) + */ + public static short getShort(Object array, int index) + { + if (array instanceof short[]) + return ((short[]) array)[index]; + return getByte(array, index); + } + + /** + * Gets an element of an int array. + * + * @param array the array to access + * @param index the array index to access + * @return the int element at <code>array[index]</code> + * @throws IllegalArgumentException if <code>array</code> is not a byte, + * char, short, or int array + * @throws NullPointerException if <code>array</code> is null + * @throws ArrayIndexOutOfBoundsException if <code>index</code> is out of + * bounds + * @see #get(Object, int) + */ + public static int getInt(Object array, int index) + { + if (array instanceof int[]) + return ((int[]) array)[index]; + if (array instanceof char[]) + return ((char[]) array)[index]; + return getShort(array, index); + } + + /** + * Gets an element of a long array. + * + * @param array the array to access + * @param index the array index to access + * @return the long element at <code>array[index]</code> + * @throws IllegalArgumentException if <code>array</code> is not a byte, + * char, short, int, or long array + * @throws NullPointerException if <code>array</code> is null + * @throws ArrayIndexOutOfBoundsException if <code>index</code> is out of + * bounds + * @see #get(Object, int) + */ + public static long getLong(Object array, int index) + { + if (array instanceof long[]) + return ((long[]) array)[index]; + return getInt(array, index); + } + + /** + * Gets an element of a float array. + * + * @param array the array to access + * @param index the array index to access + * @return the float element at <code>array[index]</code> + * @throws IllegalArgumentException if <code>array</code> is not a byte, + * char, short, int, long, or float array + * @throws NullPointerException if <code>array</code> is null + * @throws ArrayIndexOutOfBoundsException if <code>index</code> is out of + * bounds + * @see #get(Object, int) + */ + public static float getFloat(Object array, int index) + { + if (array instanceof float[]) + return ((float[]) array)[index]; + return getLong(array, index); + } + + /** + * Gets an element of a double array. + * + * @param array the array to access + * @param index the array index to access + * @return the double element at <code>array[index]</code> + * @throws IllegalArgumentException if <code>array</code> is not a byte, + * char, short, int, long, float, or double array + * @throws NullPointerException if <code>array</code> is null + * @throws ArrayIndexOutOfBoundsException if <code>index</code> is out of + * bounds + * @see #get(Object, int) + */ + public static double getDouble(Object array, int index) + { + if (array instanceof double[]) + return ((double[]) array)[index]; + return getFloat(array, index); + } + + /** + * Sets an element of an array. If the array is primitive, then the new + * value is unwrapped and widened. + * + * @param array the array to set a value of + * @param index the array index to set the value to + * @param value the value to set + * @throws IllegalArgumentException if <code>array</code> is not an array, + * or the array is primitive and unwrapping value fails, or the + * value is not assignable to the array component type + * @throws NullPointerException if array is null, or if array is primitive + * and value is null + * @throws ArrayIndexOutOfBoundsException if <code>index</code> is out of + * bounds + * @see #setBoolean(Object, int, boolean) + * @see #setByte(Object, int, byte) + * @see #setChar(Object, int, char) + * @see #setShort(Object, int, short) + * @see #setInt(Object, int, int) + * @see #setLong(Object, int, long) + * @see #setFloat(Object, int, float) + * @see #setDouble(Object, int, double) + */ + public static void set(Object array, int index, Object value) + { + if (array instanceof Object[]) + { + // Too bad the API won't let us throw the easier ArrayStoreException! + if (value != null + && ! array.getClass().getComponentType().isInstance(value)) + throw new IllegalArgumentException(); + ((Object[]) array)[index] = value; + } + else if (value instanceof Byte) + setByte(array, index, ((Byte) value).byteValue()); + 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()); + else if (value instanceof Character) + setChar(array, index, ((Character) value).charValue()); + else if (value instanceof Boolean) + setBoolean(array, index, ((Boolean) value).booleanValue()); + else if (array == null) + throw new NullPointerException(); + else + throw new IllegalArgumentException(); + } + + /** + * Sets an element of a boolean array. + * + * @param array the array to set a value of + * @param index the array index to set the value to + * @param value the value to set + * @throws IllegalArgumentException if <code>array</code> is not a boolean + * array + * @throws NullPointerException if <code>array</code> is null + * @throws ArrayIndexOutOfBoundsException if <code>index</code> is out of + * bounds + * @see #set(Object, int, Object) + */ + public static void setBoolean(Object array, int index, boolean value) + { + if (array instanceof boolean[]) + ((boolean[]) array)[index] = value; + else if (array == null) + throw new NullPointerException(); + else + throw new IllegalArgumentException(); + } + + /** + * Sets an element of a byte array. + * + * @param array the array to set a value of + * @param index the array index to set the value to + * @param value the value to set + * @throws IllegalArgumentException if <code>array</code> is not a byte, + * short, int, long, float, or double array + * @throws NullPointerException if <code>array</code> is null + * @throws ArrayIndexOutOfBoundsException if <code>index</code> is out of + * bounds + * @see #set(Object, int, Object) + */ + public static void setByte(Object array, int index, byte value) + { + if (array instanceof byte[]) + ((byte[]) array)[index] = value; + else + setShort(array, index, value); + } + + /** + * Sets an element of a char array. + * + * @param array the array to set a value of + * @param index the array index to set the value to + * @param value the value to set + * @throws IllegalArgumentException if <code>array</code> is not a char, + * int, long, float, or double array + * @throws NullPointerException if <code>array</code> is null + * @throws ArrayIndexOutOfBoundsException if <code>index</code> is out of + * bounds + * @see #set(Object, int, Object) + */ + public static void setChar(Object array, int index, char value) + { + if (array instanceof char[]) + ((char[]) array)[index] = value; + else + setInt(array, index, value); + } + + /** + * Sets an element of a short array. + * + * @param array the array to set a value of + * @param index the array index to set the value to + * @param value the value to set + * @throws IllegalArgumentException if <code>array</code> is not a short, + * int, long, float, or double array + * @throws NullPointerException if <code>array</code> is null + * @throws ArrayIndexOutOfBoundsException if <code>index</code> is out of + * bounds + * @see #set(Object, int, Object) + */ + public static void setShort(Object array, int index, short value) + { + if (array instanceof short[]) + ((short[]) array)[index] = value; + else + setInt(array, index, value); + } + + /** + * Sets an element of an int array. + * + * @param array the array to set a value of + * @param index the array index to set the value to + * @param value the value to set + * @throws IllegalArgumentException if <code>array</code> is not an int, + * long, float, or double array + * @throws NullPointerException if <code>array</code> is null + * @throws ArrayIndexOutOfBoundsException if <code>index</code> is out of + * bounds + * @see #set(Object, int, Object) + */ + public static void setInt(Object array, int index, int value) + { + if (array instanceof int[]) + ((int[]) array)[index] = value; + else + setLong(array, index, value); + } + + /** + * Sets an element of a long array. + * + * @param array the array to set a value of + * @param index the array index to set the value to + * @param value the value to set + * @throws IllegalArgumentException if <code>array</code> is not a long, + * float, or double array + * @throws NullPointerException if <code>array</code> is null + * @throws ArrayIndexOutOfBoundsException if <code>index</code> is out of + * bounds + * @see #set(Object, int, Object) + */ + public static void setLong(Object array, int index, long value) + { + if (array instanceof long[]) + ((long[]) array)[index] = value; + else + setFloat(array, index, value); + } + + /** + * Sets an element of a float array. + * + * @param array the array to set a value of + * @param index the array index to set the value to + * @param value the value to set + * @throws IllegalArgumentException if <code>array</code> is not a float + * or double array + * @throws NullPointerException if <code>array</code> is null + * @throws ArrayIndexOutOfBoundsException if <code>index</code> is out of + * bounds + * @see #set(Object, int, Object) + */ + public static void setFloat(Object array, int index, float value) + { + if (array instanceof float[]) + ((float[]) array)[index] = value; + else + setDouble(array, index, value); + } + + /** + * Sets an element of a double array. + * + * @param array the array to set a value of + * @param index the array index to set the value to + * @param value the value to set + * @throws IllegalArgumentException if <code>array</code> is not a double + * array + * @throws NullPointerException if <code>array</code> is null + * @throws ArrayIndexOutOfBoundsException if <code>index</code> is out of + * bounds + * @see #set(Object, int, Object) + */ + public static void setDouble(Object array, int index, double value) + { + if (array instanceof double[]) + ((double[]) array)[index] = value; + else if (array == null) + throw new NullPointerException(); + else + throw new IllegalArgumentException(); + } + + /** + * Dynamically and recursively create a multi-dimensioned array of objects. + * + * @param type guaranteed to be a valid object type + * @param dimensions the dimensions of the array + * @param index index of the current dimension to build + * @return the new multi-dimensioned array + * @throws NegativeArraySizeException if any entry of dimensions is negative + * @throws OutOfMemoryError if memory allocation fails + */ + // This would be faster if implemented natively, using the multianewarray + // bytecode instead of this recursive call + private static Object createMultiArray(Class type, int[] dimensions, + int index) + { + if (index == dimensions.length - 1) + return newInstance(type, dimensions[index]); + + Object toAdd = createMultiArray(type, dimensions, index + 1); + Class thisType = toAdd.getClass(); + Object[] retval + = (Object[]) VMArray.createObjectArray(thisType, dimensions[index]); + if (dimensions[index] > 0) + retval[0] = toAdd; + int i = dimensions[index]; + while (--i > 0) + retval[i] = createMultiArray(type, dimensions, index + 1); + return retval; + } + +} |