    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 &lt;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    }