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/*
* Copyright 2013 - 2014 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 java.util.Calendar;
import java.util.Date;
import java.util.TimeZone;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import org.jboss.netty.channel.Channel;
import org.jboss.netty.channel.ChannelHandlerContext;
import org.traccar.BaseProtocolDecoder;
import org.traccar.model.Position;
public class SyrusProtocolDecoder extends BaseProtocolDecoder {
boolean sendResponse;
public SyrusProtocolDecoder(String protocol, boolean sendResponse) {
super(protocol);
this.sendResponse = sendResponse;
}
private static final Pattern pattern = Pattern.compile(
"R[EP]V" + // Type
"(?:\\d{2}" + // Event index
"(\\d{4})" + // Week
"(\\d))?" + // Day
"(\\d{5})" + // Seconds
"([\\+\\-]\\d{2})(\\d{5})" + // Latitude
"([\\+\\-]\\d{3})(\\d{5})" + // Longitude
"(\\d{3})" + // Speed
"(\\d{3})" + // Course
"\\d" + // Fix mode
"(\\d)" + // Fix age
".*\r?\n?");
private Date getTime(long week, long day, long seconds) {
Calendar time = Calendar.getInstance(TimeZone.getTimeZone("UTC"));
time.clear();
time.set(Calendar.YEAR, 1980);
time.set(Calendar.MONTH, 0);
time.set(Calendar.DAY_OF_MONTH, 6);
long millis = time.getTimeInMillis();
millis += ((week * 7 + day) * 24 * 60 * 60 + seconds) * 1000;
return new Date(millis);
}
private Date getTime(long seconds) {
Calendar time = Calendar.getInstance(TimeZone.getTimeZone("UTC"));
time.set(Calendar.HOUR_OF_DAY, 0);
time.set(Calendar.MINUTE, 0);
time.set(Calendar.SECOND, 0);
time.set(Calendar.MILLISECOND, 0);
long millis = time.getTimeInMillis() + seconds * 1000;
long diff = new Date().getTime() - millis;
if (diff > 12 * 60 * 60 * 1000) {
millis += 24 * 60 * 60 * 1000;
} else if (diff < -12 * 60 * 60 * 1000) {
millis -= 24 * 60 * 60 * 1000;
}
return new Date(millis);
}
@Override
protected Object decode(
ChannelHandlerContext ctx, Channel channel, Object msg)
throws Exception {
String sentence = (String) msg;
// Find message start
int beginIndex = sentence.indexOf('>');
if (beginIndex != -1) {
sentence = sentence.substring(beginIndex + 1);
}
// Find device ID
beginIndex = sentence.indexOf(";ID=");
if (beginIndex != -1) {
beginIndex += 4;
int endIndex = sentence.indexOf(';', beginIndex);
if (endIndex == -1) {
endIndex = sentence.length();
}
// Find device in database
String id = sentence.substring(beginIndex, endIndex);
if (!identify(id)) {
return null;
}
// Send response
if (sendResponse && channel != null) {
channel.write(id);
}
} else {
return null;
}
// Parse message
Matcher parser = pattern.matcher(sentence);
if (!parser.matches()) {
return null;
}
// Create new position
Position position = new Position();
position.setProtocol(getProtocol());
position.setDeviceId(getDeviceId());
Integer index = 1;
// Time
String week = parser.group(index++);
String day = parser.group(index++);
int seconds = Integer.valueOf(parser.group(index++));
if (week != null && day != null) {
position.setTime(getTime(Integer.valueOf(week), Integer.valueOf(day), seconds));
} else {
position.setTime(getTime(seconds));
}
// Latitude
String latitude = parser.group(index) + '.' + parser.group(index + 1);
index += 2;
position.setLatitude(Double.valueOf(latitude));
// Latitude
String longitude = parser.group(index) + '.' + parser.group(index + 1);
index += 2;
position.setLongitude(Double.valueOf(longitude));
// Speed and Course
position.setSpeed(Double.valueOf(parser.group(index++)) * 0.868976);
position.setCourse(Double.valueOf(parser.group(index++)));
// Validity
position.setValid(Integer.valueOf(parser.group(index++)) == 2);
return position;
}
}
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