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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.protocol;
import org.jboss.netty.buffer.ChannelBuffer;
import org.jboss.netty.buffer.ChannelBuffers;
import org.traccar.BaseProtocolEncoder;
import org.traccar.helper.Checksum;
import org.traccar.model.Command;
public class CityeasyProtocolEncoder extends BaseProtocolEncoder {
private ChannelBuffer encodeContent(int type, ChannelBuffer content) {
ChannelBuffer buf = ChannelBuffers.dynamicBuffer();
buf.writeByte('S');
buf.writeByte('S');
buf.writeShort(2 + 2 + 2 + content.readableBytes() + 4 + 2 + 2);
buf.writeShort(type);
buf.writeBytes(content);
buf.writeInt(0x0B);
buf.writeShort(Checksum.crc16(Checksum.CRC16_KERMIT, buf.toByteBuffer()));
buf.writeByte('\r');
buf.writeByte('\n');
return buf;
}
@Override
protected Object encodeCommand(Command command) {
ChannelBuffer content = ChannelBuffers.dynamicBuffer();
switch (command.getType()) {
case Command.TYPE_POSITION_SINGLE:
return encodeContent(CityeasyProtocolDecoder.MSG_LOCATION_REQUEST, content);
case Command.TYPE_POSITION_PERIODIC:
content.writeShort(((Number) command.getAttributes().get(Command.KEY_FREQUENCY)).intValue());
return encodeContent(CityeasyProtocolDecoder.MSG_LOCATION_INTERVAL, content);
case Command.TYPE_POSITION_STOP:
content.writeShort(0);
return encodeContent(CityeasyProtocolDecoder.MSG_LOCATION_INTERVAL, content);
case Command.TYPE_SET_TIMEZONE:
int timezone = ((Number) command.getAttributes().get(Command.KEY_TIMEZONE)).intValue();
content.writeByte(timezone < 0 ? 1 : 0);
content.writeShort(Math.abs(timezone) / 60);
return encodeContent(CityeasyProtocolDecoder.MSG_TIMEZONE, content);
}
return null;
}
}
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