    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.collections4.list;
    018
    019import java.io.IOException;
    020import java.io.ObjectInputStream;
    021import java.io.ObjectOutputStream;
    022import java.util.Collection;
    023import java.util.List;
    024
    025/**
    026 * Serializable subclass of AbstractListDecorator.
    027 *
    028 * @param <E> the type of the elements in the list.
    029 * @since 3.1
    030 */
    031public abstract class AbstractSerializableListDecorator<E> extends AbstractListDecorator<E> {
    032
    033    /** Serialization version */
    034    private static final long serialVersionUID = 2684959196747496299L;
    035
    036    /**
    037     * Constructor that wraps (not copies).
    038     *
    039     * @param list  the list to decorate, must not be null
    040     * @throws NullPointerException if list is null
    041     */
    042    protected AbstractSerializableListDecorator(final List<E> list) {
    043        super(list);
    044    }
    045
    046    /**
    047     * Deserializes the list in using a custom routine.
    048     *
    049     * @param in  the input stream
    050     * @throws IOException if an error occurs while reading from the stream
    051     * @throws ClassNotFoundException if an object read from the stream cannot be loaded
    052     */
    053    @SuppressWarnings("unchecked")
    054    private void readObject(final ObjectInputStream in) throws IOException, ClassNotFoundException {
    055        in.defaultReadObject();
    056        setCollection((Collection<E>) in.readObject());
    057    }
    058
    059    /**
    060     * Serializes this object to an ObjectOutputStream.
    061     *
    062     * @param out the target ObjectOutputStream.
    063     * @throws IOException thrown when an I/O errors occur writing to the target stream.
    064     */
    065    private void writeObject(final ObjectOutputStream out) throws IOException {
    066        out.defaultWriteObject();
    067        out.writeObject(decorated());
    068    }
    069
    070}