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/*
* Copyright (c) 2009-2010 jMonkeyEngine
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* * Neither the name of 'jMonkeyEngine' nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
package com.jme3.network.serializing.serializers;
import com.jme3.network.serializing.Serializer;
import com.jme3.network.serializing.SerializerRegistration;
import java.io.IOException;
import java.nio.ByteBuffer;
import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;
import java.util.Map.Entry;
import java.util.Set;
import java.util.logging.Level;
public class MapSerializer extends Serializer {
/*
Structure:
struct Map {
INT length
BYTE flags = { 0x01 = all keys have the same type,
0x02 = all values have the same type }
if (flags has 0x01 set)
SHORT keyType
if (flags has 0x02 set)
SHORT valType
struct MapEntry[length] entries {
if (flags does not have 0x01 set)
SHORT keyType
OBJECT key
if (flags does not have 0x02 set)
SHORT valType
OBJECT value
}
}
*/
@SuppressWarnings("unchecked")
public <T> T readObject(ByteBuffer data, Class<T> c) throws IOException {
int length = data.getInt();
Map map;
try {
map = (Map)c.newInstance();
} catch (Exception e) {
log.log(Level.WARNING, "[Serializer][???] Could not determine map type. Using HashMap.");
map = new HashMap();
}
if (length == 0) return (T)map;
int flags = data.get() & 0xff;
boolean uniqueKeys = (flags & 0x01) == 0;
boolean uniqueVals = (flags & 0x02) == 0;
Class keyClazz = null;
Class valClazz = null;
Serializer keySerial = null;
Serializer valSerial = null;
if (!uniqueKeys){
SerializerRegistration reg = Serializer.readClass(data);
keyClazz = reg.getType();
keySerial = reg.getSerializer();
}
if (!uniqueVals){
SerializerRegistration reg = Serializer.readClass(data);
valClazz = reg.getType();
valSerial = reg.getSerializer();
}
for (int i = 0; i < length; i++){
Object key;
Object value;
if (uniqueKeys){
key = Serializer.readClassAndObject(data);
}else{
key = keySerial.readObject(data, keyClazz);
}
if (uniqueVals){
value = Serializer.readClassAndObject(data);
}else{
value = valSerial.readObject(data, valClazz);
}
map.put(key, value);
}
return (T)map;
}
@SuppressWarnings("unchecked")
public void writeObject(ByteBuffer buffer, Object object) throws IOException {
Map map = (Map)object;
int length = map.size();
buffer.putInt(length);
if (length == 0) return;
Set<Entry> entries = map.entrySet();
Iterator<Entry> it = entries.iterator();
Entry entry = it.next();
Class keyClass = entry.getKey().getClass();
Class valClass = entry.getValue().getClass();
while (it.hasNext()) {
entry = it.next();
if (entry.getKey().getClass() != keyClass){
keyClass = null;
if (valClass == null)
break;
}
if (entry.getValue().getClass() != valClass){
valClass = null;
if (keyClass == null)
break;
}
}
boolean uniqueKeys = keyClass == null;
boolean uniqueVals = valClass == null;
int flags = 0;
if (!uniqueKeys) flags |= 0x01;
if (!uniqueVals) flags |= 0x02;
buffer.put( (byte) flags );
Serializer keySerial = null, valSerial = null;
if (!uniqueKeys){
Serializer.writeClass(buffer, keyClass);
keySerial = Serializer.getSerializer(keyClass);
}
if (!uniqueVals){
Serializer.writeClass(buffer, valClass);
valSerial = Serializer.getSerializer(valClass);
}
it = entries.iterator();
while (it.hasNext()) {
entry = it.next();
if (uniqueKeys){
Serializer.writeClassAndObject(buffer, entry.getKey());
}else{
keySerial.writeObject(buffer, entry.getKey());
}
if (uniqueVals){
Serializer.writeClassAndObject(buffer, entry.getValue());
}else{
valSerial.writeObject(buffer, entry.getValue());
}
}
}
}
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