first working parser for SwissTiming GPS packets with test case

java/com.sap.sailing.domain.swisstimingadapter/META-INF/MANIFEST.MF

@@ -6,3 +6,4 @@ Bundle-Version: 1.0.0.qualifier
 Bundle-Vendor: SAP
 Bundle-RequiredExecutionEnvironment: JavaSE-1.6
 Require-Bundle: com.sap.sailing.domain
+Export-Package: com.sap.sailing.domain.swisstimingadapter

java/com.sap.sailing.domain.swisstimingadapter/pom.xml

@@ -0,0 +1,13 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd" xmlns="http://maven.apache.org/POM/4.0.0"
+    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
+  <modelVersion>4.0.0</modelVersion>
+  <parent>
+    <artifactId>root</artifactId>
+    <groupId>com.sap.sailing</groupId>
+    <version>0.0.1-SNAPSHOT</version>
+  </parent>
+  <artifactId>com.sap.sailing.domain.swisstimingadapter</artifactId>
+  <version>1.0.0-SNAPSHOT</version>
+  <packaging>eclipse-plugin</packaging>
+</project>

java/com.sap.sailing.domain.swisstimingadapter/src/com/sap/sailing/domain/swisstimingadapter/SwissTimingFormatException.java

@@ -0,0 +1,16 @@
+package com.sap.sailing.domain.swisstimingadapter;
+
+public class SwissTimingFormatException extends Exception {
+    private static final long serialVersionUID = -1210353206288437237L;
+    
+    private final byte[] swissTimingMessage;
+
+    public SwissTimingFormatException(String errorMessage, byte[] swissTimingMessage) {
+        super(errorMessage);
+        this.swissTimingMessage = swissTimingMessage;
+    }
+
+    public byte[] getSwissTimingMessage() {
+        return swissTimingMessage;
+    }
+}

java/com.sap.sailing.domain.swisstimingadapter/src/com/sap/sailing/domain/swisstimingadapter/SwissTimingMessage.java

@@ -0,0 +1,23 @@
+package com.sap.sailing.domain.swisstimingadapter;
+
+import com.sap.sailing.domain.base.Position;
+import com.sap.sailing.domain.base.Speed;
+import com.sap.sailing.domain.base.TimePoint;
+
+public interface SwissTimingMessage {
+    String getRaceID();
+
+    int getPacketID();
+
+    TimePoint getTimestamp();
+
+    int getGpsID();
+
+    Position getPosition();
+
+    Speed getSpeed();
+
+    int getNumberOfSatellites();
+
+    int getBatteryPercent();
+}

java/com.sap.sailing.domain.swisstimingadapter/src/com/sap/sailing/domain/swisstimingadapter/SwissTimingMessageParser.java

@@ -0,0 +1,9 @@
+package com.sap.sailing.domain.swisstimingadapter;
+
+import com.sap.sailing.domain.swisstimingadapter.impl.SwissTimingMessageParserImpl;
+
+public interface SwissTimingMessageParser {
+    SwissTimingMessageParser INSTANCE = new SwissTimingMessageParserImpl();
+    
+    SwissTimingMessage parse(byte[] message) throws SwissTimingFormatException;
+}

java/com.sap.sailing.domain.swisstimingadapter/src/com/sap/sailing/domain/swisstimingadapter/impl/SwissTimingMessageImpl.java

@@ -1,21 +1,22 @@
-package com.sap.sailing.domain.swisstimingadapter;
+package com.sap.sailing.domain.swisstimingadapter.impl;
 
 import com.sap.sailing.domain.base.Position;
 import com.sap.sailing.domain.base.Speed;
 import com.sap.sailing.domain.base.TimePoint;
+import com.sap.sailing.domain.swisstimingadapter.SwissTimingMessage;
 
-public class GPSFix {
+public class SwissTimingMessageImpl implements SwissTimingMessage {
     private final String raceID;
     private final int packetID;
     private final TimePoint timestamp;
-    private final short gpsID;
+    private final int gpsID;
     private final Position position;
     private final Speed speed;
-    private final byte numberOfSatellites;
-    private final byte batteryPercent;
+    private final int numberOfSatellites;
+    private final int batteryPercent;
     
-    public GPSFix(String raceID, int packetID, TimePoint timestamp, short gpsID, Position position, Speed speed,
-            byte numberOfSatellites, byte batteryPercent) {
+    public SwissTimingMessageImpl(String raceID, int packetID, TimePoint timestamp, int gpsID, Position position, Speed speed,
+            int numberOfSatellites, int batteryPercent) {
         super();
         this.raceID = raceID;
         this.packetID = packetID;
@@ -39,7 +40,7 @@ public class GPSFix {
         return timestamp;
     }
 
-    public short getGpsID() {
+    public int getGpsID() {
         return gpsID;
     }
 
@@ -51,11 +52,11 @@ public class GPSFix {
         return speed;
     }
 
-    public byte getNumberOfSatellites() {
+    public int getNumberOfSatellites() {
         return numberOfSatellites;
     }
 
-    public byte getBatteryPercent() {
+    public int getBatteryPercent() {
         return batteryPercent;
     }
     

java/com.sap.sailing.domain.swisstimingadapter/src/com/sap/sailing/domain/swisstimingadapter/impl/SwissTimingMessageParserImpl.java

@@ -0,0 +1,81 @@
+package com.sap.sailing.domain.swisstimingadapter.impl;
+
+import com.sap.sailing.domain.base.impl.DegreeBearingImpl;
+import com.sap.sailing.domain.base.impl.DegreePosition;
+import com.sap.sailing.domain.base.impl.KilometersPerHourSpeedWithBearingImpl;
+import com.sap.sailing.domain.base.impl.MillisecondsTimePoint;
+import com.sap.sailing.domain.swisstimingadapter.SwissTimingFormatException;
+import com.sap.sailing.domain.swisstimingadapter.SwissTimingMessage;
+import com.sap.sailing.domain.swisstimingadapter.SwissTimingMessageParser;
+
+public class SwissTimingMessageParserImpl implements SwissTimingMessageParser {
+
+    @Override
+    public SwissTimingMessage parse(byte[] message) throws SwissTimingFormatException {
+        int i=0;
+        if (message[i] != 0x10 || message[i+1] != 0x00) {
+            throw new SwissTimingFormatException("Didn't find start marker 0x1000", message);
+        }
+        i+=2;
+        String raceID = new String(message, i, 9);
+        i+=9;
+        int packetID = parseInt(message, i);
+        i+=4;
+        long timestamp = parseLong(message, i);
+        i+=8;
+        byte packetType = message[i];
+        if (packetType != 0x02) {
+            throw new SwissTimingFormatException("Expected to find package type 0x02", message);
+        }
+        i+=1;
+        short gpsID = parseShort(message, i);
+        i+=2;
+        int longitude = parseInt(message, i);
+        i+=4;
+        int latitude = parseInt(message, i);
+        i+=4;
+        int speedInDecimetersPerSecond = 0xFF & message[i];
+        i+=1;
+        int course = parseShort(message, i);
+        i+=2;
+        int numberOfSatellites = (message[i] & 0xF0) >> 4;
+        int batteryPercent = 10 * (message[i] & 0x0F);
+        i+=1;
+        if (message[i] != 0x10 || message[i+1] != 0x30) {
+            throw new SwissTimingFormatException("Didn't find end marker 0x1030", message);
+        }
+        i+=2;
+        return new SwissTimingMessageImpl(raceID, packetID, new MillisecondsTimePoint(timestamp), gpsID,
+                new DegreePosition((double) latitude / 10000000., (double) longitude / 10000000.),
+                new KilometersPerHourSpeedWithBearingImpl(0.36*speedInDecimetersPerSecond, new DegreeBearingImpl(course)),
+                numberOfSatellites, batteryPercent);
+    }
+
+    private short parseShort(byte[] message, int offset) {
+        short result = 0;
+        for (int b=0; b<2; b++) {
+            result <<= 8;
+            result += (0xFF & message[offset+b]);
+        }
+        return result;
+    }
+
+    private long parseLong(byte[] message, int offset) {
+        long result = 0l;
+        for (int b=0; b<8; b++) {
+            result <<= 8;
+            result += (0xFF & message[offset+b]);
+        }
+        return result;
+    }
+
+    private int parseInt(byte[] message, int offset) {
+        int result = 0;
+        for (int b=0; b<4; b++) {
+            result <<= 8;
+            result += (0xFF & message[offset+b]);
+        }
+        return result;
+    }
+
+}