| /* |
| * 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. |
| */ |
| package org.apache.myfaces.extensions.validator.util; |
| |
| import java.lang.reflect.Array; |
| |
| /** |
| * Utility class for managing arrays |
| * |
| * @author Anton Koinov (latest modification by $Author: grantsmith $) |
| * @version $Revision: 472630 $ $Date: 2006-11-08 20:40:03 +0000 (Wed, 08 Nov 2006) $ |
| */ |
| public class ArrayUtils |
| { |
| public static final Object[] EMPTY_OBJECT_ARRAY = new Object[0]; |
| public static final String[] EMPTY_STRING_ARRAY = new String[0]; |
| |
| //~ Constructors ------------------------------------------------------------------------------- |
| |
| protected ArrayUtils() |
| { |
| // hide from public access |
| } |
| |
| //~ Methods ------------------------------------------------------------------------------------ |
| |
| public static Class commonClass(Class c1, Class c2) |
| { |
| if (c1 == c2) |
| { |
| return c1; |
| } |
| |
| if ((c1 == Object.class) || c1.isAssignableFrom(c2)) |
| { |
| return c1; |
| } |
| |
| if (c2.isAssignableFrom(c1)) |
| { |
| return c2; |
| } |
| |
| if (c1.isPrimitive() || c2.isPrimitive()) |
| { |
| // REVISIT: we could try to autoconvert to Object or something appropriate |
| throw new IllegalArgumentException("incompatible types " + c1 + " and " + c2); |
| } |
| |
| // REVISIT: we could try to find a common supper class or interface |
| return Object.class; |
| } |
| |
| /** |
| * Concatenates two arrays into one. If arr1 is null or empty, returns arr2. |
| * If arr2 is null or empty, returns arr1. May return null if both arrays are null, |
| * or one is empty and the other null. <br> |
| * The concatenated array has componentType which is compatible with both input arrays (or Object[]) |
| * |
| * @param arr1 input array |
| * @param arr2 input array |
| * @return Object the concatenated array, elements of arr1 first |
| */ |
| public static Object concat(Object arr1, Object arr2) |
| { |
| int len1 = (arr1 == null) ? (-1) : Array.getLength(arr1); |
| |
| if (len1 <= 0) |
| { |
| return arr2; |
| } |
| |
| int len2 = (arr2 == null) ? (-1) : Array.getLength(arr2); |
| |
| if (len2 <= 0) |
| { |
| return arr1; |
| } |
| |
| Class commonComponentType = |
| commonClass(arr1.getClass().getComponentType(), arr2.getClass().getComponentType()); |
| Object newArray = Array.newInstance(commonComponentType, len1 + len2); |
| System.arraycopy(arr1, 0, newArray, 0, len1); |
| System.arraycopy(arr2, 0, newArray, len1, len2); |
| |
| return newArray; |
| } |
| |
| /** |
| * Concatenates arrays into one. Any null or empty arrays are ignored. |
| * If all arrays are null or empty, returns null. |
| * Elements will be ordered in the order in which the arrays are supplied. |
| * |
| * @param arrs array of arrays |
| * @return the concatenated array |
| */ |
| public static Object concat(Object[] arrs) |
| { |
| int totalLen = 0; |
| Class commonComponentType = null; |
| int i; |
| int len; |
| for (i = 0, len = arrs.length; i < len; i++) |
| { |
| // skip all null arrays |
| if (arrs[i] == null) |
| { |
| continue; |
| } |
| |
| int arrayLen = Array.getLength(arrs[i]); |
| |
| // skip all empty arrays |
| if (arrayLen == 0) |
| { |
| continue; |
| } |
| |
| totalLen += arrayLen; |
| |
| Class componentType = arrs[i].getClass().getComponentType(); |
| commonComponentType = |
| (commonComponentType == null) ? componentType |
| : commonClass(commonComponentType, componentType); |
| } |
| |
| if (commonComponentType == null) |
| { |
| return null; |
| } |
| |
| return concat(Array.newInstance(commonComponentType, totalLen), totalLen, arrs); |
| } |
| |
| public static Object concat(Object toArray, int totalLen, Object[] arrs) |
| { |
| if (totalLen == 0) |
| { |
| // Should we allocate an empty array instead? |
| return toArray; |
| } |
| |
| if (totalLen > Array.getLength(toArray)) |
| { |
| toArray = Array.newInstance(toArray.getClass().getComponentType(), totalLen); |
| } |
| |
| int i; |
| int len; |
| int offset; |
| for (i = 0, len = arrs.length, offset = 0; i < len; i++) |
| { |
| final Object arr = arrs[i]; |
| if (arr != null) |
| { |
| int arrayLen = Array.getLength(arr); |
| if (arrayLen > 0) |
| { |
| System.arraycopy(arr, 0, toArray, offset, arrayLen); |
| offset += arrayLen; |
| } |
| } |
| } |
| |
| return toArray; |
| } |
| |
| public static Object concat(Object arr1, Object arr2, Object arr3) |
| { |
| return concat(new Object[]{arr1, arr2, arr3}); |
| } |
| |
| public static Object concat(Object arr1, Object arr2, Object arr3, Object arr4) |
| { |
| return concat(new Object[]{arr1, arr2, arr3, arr4}); |
| } |
| |
| public static Object concat(Object arr1, Object arr2, Object arr3, Object arr4, Object arr5) |
| { |
| return concat(new Object[]{arr1, arr2, arr3, arr4, arr5}); |
| } |
| |
| public static Object concatSameType(Object toArray, Object[] arrs) |
| { |
| int totalLen = 0; |
| int i; |
| int len; |
| for (i = 0, len = arrs.length; i < len; i++) |
| { |
| if (arrs[i] != null) |
| { |
| totalLen += Array.getLength(arrs[i]); |
| } |
| } |
| |
| return concat(toArray, totalLen, arrs); |
| } |
| |
| |
| public static boolean contains(Object[] array, Object value) |
| { |
| if (array == null || array.length == 0) |
| { |
| return false; |
| } |
| |
| for (int i = 0; i < array.length; i++) |
| { |
| Object o = array[i]; |
| if ((o == null && value == null) || |
| (o != null && o.equals(value))) |
| { |
| return true; |
| } |
| } |
| |
| return false; |
| } |
| } |