COMMONS_JEXL_2_0/src/main/java/org/apache/commons/jexl2/internal/ArrayListWrapper.java

/*
 * 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.commons.jexl2.internal;

import java.lang.reflect.Array;
import java.util.AbstractList;

/**
 * A class that wraps an array with a List interface.
 * 
 * @author Chris Schultz <chris@christopherschultz.net$gt;
 * @version $Revision$ $Date: 2006-04-14 19:40:41 $
 */
public class ArrayListWrapper extends AbstractList<Object> {
    /** the array to wrap. */
    private final Object array;

    /**
     * Create the wrapper.
     * @param anArray {@link #array}
     */
    public ArrayListWrapper(Object anArray) {
        if (!anArray.getClass().isArray()) {
            throw new IllegalArgumentException(anArray.getClass() + " is not an array");
        }
        this.array = anArray;
    }

    /** {@inheritDoc} */
    @Override
    public Object get(int index) {
        return Array.get(array, index);
    }

    /** {@inheritDoc} */
    @Override
    public Object set(int index, Object element) {
        Object old = get(index);
        Array.set(array, index, element);
        return old;
    }

    /** {@inheritDoc} */
    @Override
    public int size() {
        return Array.getLength(array);
    }
}