1/*
2 * Copyright (c) 2009-2010 jMonkeyEngine
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions are
7 * met:
8 *
9 * * Redistributions of source code must retain the above copyright
10 *   notice, this list of conditions and the following disclaimer.
11 *
12 * * Redistributions in binary form must reproduce the above copyright
13 *   notice, this list of conditions and the following disclaimer in the
14 *   documentation and/or other materials provided with the distribution.
15 *
16 * * Neither the name of 'jMonkeyEngine' nor the names of its contributors
17 *   may be used to endorse or promote products derived from this software
18 *   without specific prior written permission.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
21 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
22 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
23 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
24 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
25 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
26 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
27 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
28 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
29 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
30 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
31 */
32
33package com.jme3.network.serializing.serializers;
34
35import com.jme3.network.serializing.Serializer;
36import com.jme3.network.serializing.SerializerRegistration;
37import java.io.IOException;
38import java.nio.ByteBuffer;
39import java.util.ArrayList;
40import java.util.Collection;
41import java.util.Iterator;
42import java.util.logging.Level;
43
44/**
45 * Serializes collections.
46 *
47 * @author Lars Wesselius
48 */
49public class CollectionSerializer extends Serializer {
50
51    @SuppressWarnings("unchecked")
52    public <T> T readObject(ByteBuffer data, Class<T> c) throws IOException {
53        int length = data.getInt();
54
55        Collection collection;
56        try {
57            collection = (Collection)c.newInstance();
58        } catch (Exception e) {
59            log.log(Level.FINE, "[Serializer][???] Could not determine collection type. Using ArrayList.");
60            collection = new ArrayList(length);
61        }
62
63        if (length == 0) return (T)collection;
64
65        if (data.get() == (byte)1) {
66            SerializerRegistration reg = Serializer.readClass(data);
67            Class clazz = reg.getType();
68            Serializer serializer = reg.getSerializer();
69
70            for (int i = 0; i != length; ++i) {
71                collection.add(serializer.readObject(data, clazz));
72            }
73        } else {
74            for (int i = 0; i != length; ++i) {
75                collection.add(Serializer.readClassAndObject(data));
76            }
77        }
78        return (T)collection;
79    }
80
81    public void writeObject(ByteBuffer buffer, Object object) throws IOException {
82        Collection collection = (Collection)object;
83        int length = collection.size();
84
85        buffer.putInt(length);
86        if (length == 0) return;
87
88        Iterator it = collection.iterator();
89        Class elementClass = it.next().getClass();
90        while (it.hasNext()) {
91            Object obj = it.next();
92
93            if (obj.getClass() != elementClass) {
94                elementClass = null;
95                break;
96            }
97        }
98
99        if (elementClass != null) {
100            buffer.put((byte)1);
101            Serializer.writeClass(buffer, elementClass);
102            Serializer serializer = Serializer.getSerializer(elementClass);
103
104            for (Object elem : collection) {
105                serializer.writeObject(buffer, elem);
106            }
107        } else {
108            buffer.put((byte)0);
109            for (Object elem : collection) {
110                Serializer.writeClassAndObject(buffer, elem);
111            }
112        }
113    }
114}
115