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 * Constructor. 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 /** 049 * Write the set out using a custom routine. 050 * 051 * @param out the output stream 052 * @throws IOException if an error occurs while writing to the stream 053 */ 054 private void writeObject(final ObjectOutputStream out) throws IOException { 055 out.defaultWriteObject(); 056 out.writeObject(decorated()); 057 } 058 059 /** 060 * Read the set in using a custom routine. 061 * 062 * @param in the input stream 063 * @throws IOException if an error occurs while reading from the stream 064 * @throws ClassNotFoundException if an object read from the stream can not be loaded 065 */ 066 @SuppressWarnings("unchecked") 067 private void readObject(final ObjectInputStream in) throws IOException, ClassNotFoundException { 068 in.defaultReadObject(); 069 setCollection((Collection<E>) in.readObject()); 070 } 071 072}