Refactor/ais interfaces (#133)

* Use longitude meta field to check longitude value availability in position report type B
* Expose AISPositionInfo to allow users to access basic position information more easily
* Refactor AIS position report interfaces, AISPositionReport now extends AISPositionReportB.

src/main/java/net/sf/marineapi/ais/message/AISPositionInfo.java

@@ -25,7 +25,7 @@
  * 
  * @author Lázár József
  */
-interface AISPositionInfo extends AISMessage {
+public interface AISPositionInfo extends AISMessage {
 
     /**
 	 * Tells if the position is accurate.

src/main/java/net/sf/marineapi/ais/message/AISPositionReport.java

@@ -27,10 +27,9 @@
  * See <a href="https://www.navcen.uscg.gov/?pageName=AISMessagesA">Class A AIS
  * position report</a> specification for more details on return values and
  * status codes.</p>
- *
  * @author Lázár József
  */
-public interface AISPositionReport extends AISPositionInfo {
+public interface AISPositionReport extends AISPositionReportB {
 
 	/**
 	 * Returns the navigational status.
@@ -46,40 +45,6 @@ public interface AISPositionReport extends AISPositionInfo {
 	 */
 	double getRateOfTurn();
 
-	/**
-	 * Returns the speed over ground. Notice that maximum returned speed is
-	 * 102.2, even when the actual speed is higher.
-	 *
-	 * @return Speed in knots 0-102.2 or 102.3 when not available.
-	 */
-	double getSpeedOverGround();
-
-	/**
-	 * Returns the course over ground.
-	 *
-	 * @return Course in degrees 0-359.9 or 360 when not available (default).
-	 */
-	double getCourseOverGround();
-
-	/**
-	 * Returns the true heading.
-	 *
-	 * @return Heading in degrees 0-359 or 511 when not available (default).
-	 */
-	int getTrueHeading();
-
-	/**
-	 * Returns the time stamp contained in the message, i.e. UTC second when the
-	 * report was generated by the electronic position system.
-	 *
-	 * @return 0-59 or 60 if time stamp is not available, which should also be
-	 *         the default value. 61 if positioning system is in manual input
-	 *         mode, or 62 if electronic position fixing system operates in
-	 *         estimated (dead reckoning) mode, or 63 if the positioning system
-	 *         is inoperative.
-	 */
-	int getTimeStamp();
-
 	/**
 	 * Returns the manouver indicator.
 	 *
@@ -94,32 +59,4 @@ public interface AISPositionReport extends AISPositionInfo {
 	 * @return true if has ROT, otherwise false.
 	 */
 	boolean hasRateOfTurn();
-
-	/**
-	 * Returns true if speed over ground is available in the message.
-	 *
-	 * @return true if has SOG, otherwise false.
-	 */
-	boolean hasSpeedOverGround();
-
-	/**
-	 * Returns true if course over ground is available in the message.
-	 *
-	 * @return true if has COG, otherwise false.
-	 */
-	boolean hasCourseOverGround();
-
-	/**
-	 * Returns true if true heading is available in the message.
-	 *
-	 * @return true if has true heading, otherwise false.
-	 */
-	boolean hasTrueHeading();
-
-	/**
-	 * Returns true if timestamp is available in the message.
-	 *
-	 * @return true if has time stamp, otherwise false.
-	 */
-	boolean hasTimeStamp();
 }

src/main/java/net/sf/marineapi/ais/message/AISPositionReportB.java

@@ -28,34 +28,36 @@
 public interface AISPositionReportB extends AISPositionInfo {
 
 	/**
-	 * Returns the speed over ground.
+	 * Returns the speed over ground. Notice that maximum returned speed is
+	 * 102.2, even when the actual speed is higher.
 	 *
-	 * @return Speed over ground
+	 * @return Speed in knots 0-102.2 or 102.3 when not available.
 	 */
 	double getSpeedOverGround();
 
 	/**
 	 * Returns the course over ground.
 	 *
-	 * @return Course over ground
+	 * @return Course in degrees 0-359.9 or 360 when not available (default).
 	 */
 	double getCourseOverGround();
 
 	/**
 	 * Returns the true heading.
 	 *
-	 * @return true heading value, in degrees
+	 * @return Heading in degrees 0-359 or 511 when not available (default).
 	 */
 	int getTrueHeading();
 
 	/**
-	 * Returns the message time stamp. UTC second when the report was generated
-	 * by the EPFS (0-59). 60 if time stamp is not available, which should also
-	 * be the default value. 61 if positioning system is in manual input mode.
-	 * 62 if electronic position fixing system operates in estimated (dead
-	 * reckoning) mode. 63 if the positioning system is inoperative.
+	 * Returns the time stamp contained in the message, i.e. UTC second when the
+	 * report was generated by the electronic position system.
 	 *
-	 * @return Timestamp value
+	 * @return 0-59 or 60 if time stamp is not available, which should also be
+	 *         the default value. 61 if positioning system is in manual input
+	 *         mode, or 62 if electronic position fixing system operates in
+	 *         estimated (dead reckoning) mode, or 63 if the positioning system
+	 *         is inoperative.
 	 */
 	int getTimeStamp();
 

src/main/java/net/sf/marineapi/ais/parser/AISPositionReportBParser.java

@@ -149,7 +149,7 @@ public boolean hasTimeStamp() {
 
 	@Override
 	public boolean hasLongitude() {
-		return Latitude27.isAvailable(fLongitude);
+		return Longitude28.isAvailable(fLongitude);
 	}
 
 	@Override