From 79b7b8145b69163d555d0be47f5c590a9ff3257b Mon Sep 17 00:00:00 2001
From: Anton Tananaev <anton.tananaev@gmail.com>
Date: Wed, 4 Nov 2015 12:10:19 +1300
Subject: Refactor GT02 protocol decoder

---
 src/org/traccar/protocol/Gt02ProtocolDecoder.java | 45 +++++++++--------------
 1 file changed, 17 insertions(+), 28 deletions(-)

(limited to 'src')

diff --git a/src/org/traccar/protocol/Gt02ProtocolDecoder.java b/src/org/traccar/protocol/Gt02ProtocolDecoder.java
index 76756f41d..81a04be0a 100644
--- a/src/org/traccar/protocol/Gt02ProtocolDecoder.java
+++ b/src/org/traccar/protocol/Gt02ProtocolDecoder.java
@@ -1,5 +1,5 @@
 /*
- * Copyright 2012 Anton Tananaev (anton.tananaev@gmail.com)
+ * Copyright 2012 - 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.
@@ -16,12 +16,12 @@
 package org.traccar.protocol;
 
 import java.net.SocketAddress;
-import java.util.Calendar;
-import java.util.TimeZone;
 import org.jboss.netty.buffer.ChannelBuffer;
 import org.jboss.netty.buffer.ChannelBuffers;
 import org.jboss.netty.channel.Channel;
 import org.traccar.BaseProtocolDecoder;
+import org.traccar.helper.BitUtil;
+import org.traccar.helper.DateBuilder;
 import org.traccar.helper.UnitsConverter;
 import org.traccar.model.Event;
 import org.traccar.model.Position;
@@ -49,8 +49,7 @@ public class Gt02ProtocolDecoder extends BaseProtocolDecoder {
 
     @Override
     protected Object decode(
-            Channel channel, SocketAddress remoteAddress, Object msg)
-            throws Exception {
+            Channel channel, SocketAddress remoteAddress, Object msg) throws Exception {
 
         ChannelBuffer buf = (ChannelBuffer) msg;
 
@@ -74,50 +73,40 @@ public class Gt02ProtocolDecoder extends BaseProtocolDecoder {
 
         } else if (type == MSG_DATA) {
 
-            // Create new position
             Position position = new Position();
             position.setProtocol(getProtocolName());
             position.set(Event.KEY_INDEX, index);
 
-            // Get device id
             if (!identify(imei, channel)) {
                 return null;
             }
             position.setDeviceId(getDeviceId());
 
-            // Date and time
-            Calendar time = Calendar.getInstance(TimeZone.getTimeZone("UTC"));
-            time.clear();
-            time.set(Calendar.YEAR, 2000 + buf.readUnsignedByte());
-            time.set(Calendar.MONTH, buf.readUnsignedByte() - 1);
-            time.set(Calendar.DAY_OF_MONTH, buf.readUnsignedByte());
-            time.set(Calendar.HOUR_OF_DAY, buf.readUnsignedByte());
-            time.set(Calendar.MINUTE, buf.readUnsignedByte());
-            time.set(Calendar.SECOND, buf.readUnsignedByte());
-            position.setTime(time.getTime());
-
-            // Latitude
-            double latitude = buf.readUnsignedInt() / (60.0 * 30000.0);
+            DateBuilder dateBuilder = new DateBuilder()
+                    .setDate(buf.readUnsignedByte(), buf.readUnsignedByte(), buf.readUnsignedByte())
+                    .setTime(buf.readUnsignedByte(), buf.readUnsignedByte(), buf.readUnsignedByte());
+            position.setTime(dateBuilder.getDate());
 
-            // Longitude
+            double latitude = buf.readUnsignedInt() / (60.0 * 30000.0);
             double longitude = buf.readUnsignedInt() / (60.0 * 30000.0);
 
-            // Speed
             position.setSpeed(UnitsConverter.knotsFromKph(buf.readUnsignedByte()));
-
-            // Course
             position.setCourse(buf.readUnsignedShort());
 
             buf.skipBytes(3); // reserved
 
-            // Flags
             long flags = buf.readUnsignedInt();
-            position.setValid((flags & 0x1) == 0x1);
-            if ((flags & 0x2) == 0) latitude = -latitude;
-            if ((flags & 0x4) == 0) longitude = -longitude;
+            position.setValid(BitUtil.check(flags, 0));
+            if (!BitUtil.check(flags, 1)) {
+                latitude = -latitude;
+            }
+            if (!BitUtil.check(flags, 2)) {
+                longitude = -longitude;
+            }
 
             position.setLatitude(latitude);
             position.setLongitude(longitude);
+
             return position;
         }
 
-- 
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