    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.set;
    018
    019import java.io.IOException;
    020import java.io.ObjectInputStream;
    021import java.io.ObjectOutputStream;
    022import java.util.Collection;
    023import java.util.Set;
    024
    025/**
    026 * Serializable subclass of AbstractSetDecorator.
    027 *
    028 * @param <E> the type of the elements in this set
    029 * @since 3.1
    030 */
    031public abstract class AbstractSerializableSetDecorator<E>
    032        extends AbstractSetDecorator<E> {
    033
    034    /** Serialization version */
    035    private static final long serialVersionUID = 1229469966212206107L;
    036
    037    /**
    038     * Constructs a new instance.
    039     *
    040     * @param set  the list to decorate, must not be null
    041     * @throws NullPointerException if set is null
    042     */
    043    protected AbstractSerializableSetDecorator(final Set<E> set) {
    044        super(set);
    045    }
    046
    047    /**
    048     * Read the set in using a custom routine.
    049     *
    050     * @param in  the input stream
    051     * @throws IOException if an error occurs while reading from the stream
    052     * @throws ClassNotFoundException if an object read from the stream can not be loaded
    053     */
    054    @SuppressWarnings("unchecked")
    055    private void readObject(final ObjectInputStream in) throws IOException, ClassNotFoundException {
    056        in.defaultReadObject();
    057        setCollection((Collection<E>) in.readObject());
    058    }
    059
    060    /**
    061     * Write the set out using a custom routine.
    062     *
    063     * @param out  the output stream
    064     * @throws IOException if an error occurs while writing to the stream
    065     */
    066    private void writeObject(final ObjectOutputStream out) throws IOException {
    067        out.defaultWriteObject();
    068        out.writeObject(decorated());
    069    }
    070
    071}