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This package supports the parsing of AIS messages in Java. AIS, the Automatic Identification System, is a system aiming at improving maritime safety by exchanging messages between ships, other vehicles in particular aircraft involved in search-and-rescue (SAR), and (fixed) base stations. To be precise, this package support the ITU-R M.1371-4 AIS standard. See our extensive javadoc and in particular the class AISParser for more information on how to use this package. The parser was used in the Poseidon project, and is improved in the Metis project to better handle uncertain information. Both projects were led by the Embedded Systems Institute. In both projects Thales Nederlands was the carrying industrial partner, and multiple Dutch universities participated.

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package nl.esi.metis.aisparser;
/* ESI AIS Parser
 * 
 * Copyright 2011/2012 by Pierre van de Laar (Embedded Systems Institute)
 * Copyright 2008 by Brian C. Lane 
 * All Rights Reserved
 * 
 */

/** This class represent destinations are returned by {@link AISMessage22#getDestination()}, when the message is addressed to individual stations.
 * @author Pierre America
 * @author Pierre van de Laar
 * @author Brian C. Lane
 *
 */
public class DestinationIDs extends Destination {
	
	/** The first station ID (30 bits) */
	private int ID1;	//

	/** Returns the first station ID (30 bits). */
	public int ID1() { return ID1; }
	
	/** The value of the first spare bits */
	private int spare1;	//5 bits

	/** Returns the value of the first spare bits. This should be zero. */
	public int spare1() { return spare1; }
	
	/** The second station ID (30 bits) */
	private int ID2;	//30 bits

	/** Returns the second station ID (30 bits). */
	public int ID2() { return ID2; }

	/** The value of the second set of spare bits */
	private int spare2;	//5 bits

	/** Returns the value of the second set of spare bits. This should be zero. */
	public int spare2() { return spare2; }
	
	/** Constructs a destination ID object.
	 * @param offset the position where to start extracting information from the message
	 * @param content the content of the message
	 */
	public DestinationIDs (int offset, Sixbit content)
	{
		ID1 = content.getIntFromTo(offset, offset+29);
		spare1 = content.getIntFromTo(offset+30, offset+34);
//TODO: check spares and add annotation if not zero		
//		if(spare1 != 0)
//		{
//		   	annotations.add(new AISSpareNonZeroAnnotation(1));
//		}
		
		ID2 = content.getIntFromTo(offset+35, offset+64);
		spare2 = content.getIntFromTo(offset+65, offset+69);
//TODO: check spares and add annotation if not zero
//		if(spare2 != 0)
//		{
//		  	annotations.add(new AISSpareNonZeroAnnotation(2));
//		}
	}

}