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/*
* Copyright 2015 Anton Tananaev (anton.tananaev@gmail.com)
*
* 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 org.traccar;
import java.net.SocketAddress;
import java.util.Collection;
import org.jboss.netty.channel.Channel;
import org.jboss.netty.channel.ChannelEvent;
import org.jboss.netty.channel.ChannelHandlerContext;
import org.jboss.netty.channel.ChannelUpstreamHandler;
import static org.jboss.netty.channel.Channels.fireMessageReceived;
import org.jboss.netty.channel.MessageEvent;
public abstract class ExtendedObjectDecoder implements ChannelUpstreamHandler {
@Override
public void handleUpstream(
ChannelHandlerContext ctx, ChannelEvent evt) throws Exception {
if (!(evt instanceof MessageEvent)) {
ctx.sendUpstream(evt);
return;
}
MessageEvent e = (MessageEvent) evt;
Object originalMessage = e.getMessage();
Object decodedMessage = decode(e.getChannel(), e.getRemoteAddress(), originalMessage);
if (originalMessage == decodedMessage) {
ctx.sendUpstream(evt);
} else if (decodedMessage != null) {
if (decodedMessage instanceof Collection) {
for (Object o : (Collection) decodedMessage) {
fireMessageReceived(ctx, o, e.getRemoteAddress());
}
} else {
fireMessageReceived(ctx, decodedMessage, e.getRemoteAddress());
}
}
}
protected abstract Object decode(Channel channel, SocketAddress remoteAddress, Object msg) throws Exception;
}
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