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     */
017    package org.apache.commons.jexl2.internal;
018    
019    import java.lang.reflect.Array;
020    import java.util.AbstractList;
021    
022    /**
023     * A class that wraps an array with a List interface.
024     * 
025     * @author Chris Schultz <chris@christopherschultz.net$gt;
026     * @version $Revision$ $Date: 2006-04-14 19:40:41 $
027     */
028    public class ArrayListWrapper extends AbstractList<Object> {
029        /** the array to wrap. */
030        private final Object array;
031    
032        /**
033         * Create the wrapper.
034         * @param anArray {@link #array}
035         */
036        public ArrayListWrapper(Object anArray) {
037            if (!anArray.getClass().isArray()) {
038                throw new IllegalArgumentException(anArray.getClass() + " is not an array");
039            }
040            this.array = anArray;
041        }
042    
043        /** {@inheritDoc} */
044        @Override
045        public Object get(int index) {
046            return Array.get(array, index);
047        }
048    
049        /** {@inheritDoc} */
050        @Override
051        public Object set(int index, Object element) {
052            Object old = get(index);
053            Array.set(array, index, element);
054            return old;
055        }
056    
057        /** {@inheritDoc} */
058        @Override
059        public int size() {
060            return Array.getLength(array);
061        }
062    }