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/*
* Copyright 2015 - 2016 Anton Tananaev (anton@traccar.org)
*
* 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 org.jboss.netty.buffer.ChannelBuffer;
import org.jboss.netty.buffer.ChannelBuffers;
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 org.jboss.netty.channel.Channels;
import org.jboss.netty.channel.MessageEvent;
import org.traccar.model.Position;
import javax.xml.bind.DatatypeConverter;
import java.net.SocketAddress;
import java.nio.charset.StandardCharsets;
import java.util.Collection;
public abstract class ExtendedObjectDecoder implements ChannelUpstreamHandler {
private void saveOriginal(Object decodedMessage, Object originalMessage) {
if (Context.getConfig().getBoolean("database.saveOriginal") && decodedMessage instanceof Position) {
Position position = (Position) decodedMessage;
if (originalMessage instanceof ChannelBuffer) {
ChannelBuffer buf = (ChannelBuffer) originalMessage;
position.set(Position.KEY_ORIGINAL, ChannelBuffers.hexDump(buf, 0, buf.writerIndex()));
} else if (originalMessage instanceof String) {
position.set(Position.KEY_ORIGINAL, DatatypeConverter.printHexBinary(
((String) originalMessage).getBytes(StandardCharsets.US_ASCII)));
}
}
}
@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);
onMessageEvent(e.getChannel(), e.getRemoteAddress(), originalMessage); // call after decode
if (originalMessage == decodedMessage) {
ctx.sendUpstream(evt);
} else {
if (decodedMessage == null) {
decodedMessage = handleEmptyMessage(e.getChannel(), e.getRemoteAddress(), originalMessage);
}
if (decodedMessage != null) {
if (decodedMessage instanceof Collection) {
for (Object o : (Collection) decodedMessage) {
saveOriginal(o, originalMessage);
Channels.fireMessageReceived(ctx, o, e.getRemoteAddress());
}
} else {
saveOriginal(decodedMessage, originalMessage);
Channels.fireMessageReceived(ctx, decodedMessage, e.getRemoteAddress());
}
}
}
}
protected void onMessageEvent(Channel channel, SocketAddress remoteAddress, Object msg) {
}
protected Object handleEmptyMessage(Channel channel, SocketAddress remoteAddress, Object msg) {
return null;
}
protected abstract Object decode(Channel channel, SocketAddress remoteAddress, Object msg) throws Exception;
}
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