001/* 002 * Licensed to the Apache Software Foundation (ASF) under one or more 003 * contributor license agreements. See the NOTICE file distributed with 004 * this work for additional information regarding copyright ownership. 005 * The ASF licenses this file to You under the Apache License, Version 2.0 006 * (the "License"); you may not use this file except in compliance with 007 * the License. You may obtain a copy of the License at 008 * 009 * http://www.apache.org/licenses/LICENSE-2.0 010 * 011 * Unless required by applicable law or agreed to in writing, software 012 * distributed under the License is distributed on an "AS IS" BASIS, 013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 014 * See the License for the specific language governing permissions and 015 * limitations under the License. 016 */ 017package org.apache.commons.jexl3.internal.introspection; 018 019import java.lang.reflect.Array; 020import java.util.AbstractList; 021import java.util.RandomAccess; 022 023/** 024 * A class that wraps an array within an AbstractList. 025 * <p> 026 * It overrides some methods because introspection uses this class a a marker for wrapped arrays; the declared class 027 * for these method is thus ArrayListWrapper. 028 * The methods are get/set/size/contains and indexOf because it is used by contains. 029 * </p> 030 */ 031public class ArrayListWrapper extends AbstractList<Object> implements RandomAccess { 032 /** the array to wrap. */ 033 private final Object array; 034 035 /** 036 * Create the wrapper. 037 * @param anArray {@link #array} 038 */ 039 public ArrayListWrapper(final Object anArray) { 040 if (!anArray.getClass().isArray()) { 041 throw new IllegalArgumentException(anArray.getClass() + " is not an array"); 042 } 043 this.array = anArray; 044 } 045 046 @Override 047 public Object get(final int index) { 048 return Array.get(array, index); 049 } 050 051 @Override 052 public Object set(final int index, final Object element) { 053 final Object old = Array.get(array, index); 054 Array.set(array, index, element); 055 return old; 056 } 057 058 @Override 059 public int size() { 060 return Array.getLength(array); 061 } 062 063 @Override 064 public int indexOf(final Object o) { 065 final int size = size(); 066 if (o == null) { 067 for (int i = 0; i < size; i++) { 068 if (get(i) == null) { 069 return i; 070 } 071 } 072 } else { 073 for (int i = 0; i < size; i++) { 074 if (o.equals(get(i))) { 075 return i; 076 } 077 } 078 } 079 return -1; 080 } 081 082 @Override 083 public boolean contains(final Object o) { 084 return indexOf(o) != -1; 085 } 086}