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Java Marine API is an NMEA 0183 library for Java (http://ktuukkan.github.io/marine-api/).

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/* 
 * HDTParser.java
 * Copyright (C) 2011 Kimmo Tuukkanen
 * 
 * This file is part of Java Marine API.
 * 
 * 
 * Java Marine API is free software: you can redistribute it and/or modify it
 * under the terms of the GNU Lesser General Public License as published by the
 * Free Software Foundation, either version 3 of the License, or (at your
 * option) any later version.
 * 
 * Java Marine API is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License
 * for more details.
 * 
 * You should have received a copy of the GNU Lesser General Public License
 * along with Java Marine API. If not, see .
 */
package net.sf.marineapi.nmea.parser;

import net.sf.marineapi.nmea.sentence.HDTSentence;
import net.sf.marineapi.nmea.sentence.SentenceId;
import net.sf.marineapi.nmea.sentence.TalkerId;

/**
 * HDT sentence parser.
 * 
 * @author Kimmo Tuukkanen
 */
class HDTParser extends SentenceParser implements HDTSentence {

	private static final int HEADING = 0;
	private static final int TRUE_INDICATOR = 1;

	/**
	 * Creates a new HDT parser.
	 * 
	 * @param nmea HDT sentence String to parse.
	 */
	public HDTParser(String nmea) {
		super(nmea, SentenceId.HDT);
	}

	/**
	 * Creates a new empty HDT sentence.
	 * 
	 * @param talker Talker id to set
	 */
	public HDTParser(TalkerId talker) {
		super(talker, SentenceId.HDT, 2);
		setCharValue(TRUE_INDICATOR, 'T');
	}

	/*
	 * (non-Javadoc)
	 * @see net.sf.marineapi.nmea.parser.HeadingSentence#getHeading()
	 */
	public double getHeading() {
		return getDoubleValue(HEADING);
	}

	/*
	 * (non-Javadoc)
	 * @see net.sf.marineapi.nmea.sentence.HeadingSentence#isTrue()
	 */
	public boolean isTrue() {
		return true;
	}

	/*
	 * (non-Javadoc)
	 * @see net.sf.marineapi.nmea.parser.HeadingSentence#setHeading(double)
	 */
	public void setHeading(double hdt) {
		setDegreesValue(HEADING, hdt);
	}
}