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/*
* Copyright 2012 - 2013 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 org.jboss.netty.channel.Channel;
import org.jboss.netty.channel.ChannelEvent;
import org.jboss.netty.channel.ChannelHandlerContext;
import static org.jboss.netty.channel.Channels.fireMessageReceived;
import org.jboss.netty.channel.MessageEvent;
import org.jboss.netty.handler.codec.oneone.OneToOneDecoder;
import org.traccar.database.DataManager;
/**
* Base class for protocol decoders
*/
public abstract class BaseProtocolDecoder extends OneToOneDecoder {
private final ServerManager serverManager;
private final DataManager dataManager;
private final String protocol;
public final DataManager getDataManager() {
return dataManager;
}
public final ServerManager getServerManager() {
return serverManager;
}
public final String getProtocol() {
return protocol;
}
public BaseProtocolDecoder(DataManager dataManager) {
// This constructor must only be used by test classes.
// There should be a way to check this at compile time.
assert (dataManager != null) :
"BaseProtocolDecoder() initialized with NULL dataManager";
serverManager = null;
protocol = null;
this.dataManager = dataManager;
}
public BaseProtocolDecoder(ServerManager serverManager, String protocol) {
assert (serverManager != null) :
"BaseProtocolDecoder() initialized with NULL serverManager";
assert (protocol != null) :
"BaseProtocolDecoder() initialized with NULL protocol";
this.serverManager = serverManager;
this.protocol = protocol;
dataManager = serverManager.getDataManager();
}
@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(ctx, e.getChannel(), e.getRemoteAddress(), originalMessage);
if (originalMessage == decodedMessage) {
ctx.sendUpstream(evt);
} else if (decodedMessage != null) {
fireMessageReceived(ctx, decodedMessage, e.getRemoteAddress());
}
}
protected Object decode(
ChannelHandlerContext ctx, Channel channel, SocketAddress remoteAddress, Object msg) throws Exception {
return decode(ctx, channel, msg);
}
@Override
protected Object decode(
ChannelHandlerContext ctx, Channel channel, Object msg) throws Exception {
return null; // default implementation
}
}
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