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}