/*
* Copyright 2004-2006 the original author or authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package net.sf.cindy.decoder;
import java.io.EOFException;
import java.io.IOException;
import java.io.InputStream;
import java.io.ObjectInputStream;
import java.io.ObjectStreamConstants;
import net.sf.cindy.Buffer;
import net.sf.cindy.Packet;
import net.sf.cindy.PacketDecoder;
import net.sf.cindy.Session;
/**
* Decode <code>Packet</code> to serial object.
*
* @author <a href="chenrui@gmail.com">Roger Chen</a>
* @version $id$
*/
public class SerialDecoder implements PacketDecoder {
public Object decode(Session session, Packet packet) throws Exception {
final Buffer buffer = packet.getContent();
if (buffer.remaining() < 4)
return null;
if (buffer.getShort() == ObjectStreamConstants.STREAM_MAGIC
&& buffer.getShort() == ObjectStreamConstants.STREAM_VERSION) {
buffer.skip(-4);
ObjectInputStream is = null;
try {
is = new ObjectInputStream(new InputStream() {
public int read() {
return buffer.hasRemaining() ? buffer.get() : -1;
}
public int read(byte[] bytes, int off, int len) {
if (buffer.hasRemaining()) {
len = Math.min(len, buffer.remaining());
buffer.get(bytes, off, len);
return len;
}
return -1;
}
});
return is.readObject();
} catch (EOFException e) {
} finally {
if (is != null) {
try {
is.close();
} catch (IOException e) {
}
}
}
}
return null;
}
}