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/**
 * Portions Copyright 2006 DFKI GmbH.
 * Portions Copyright 2001 Sun Microsystems, Inc.
 * Portions Copyright 1999-2001 Language Technologies Institute, 
 * Carnegie Mellon University.
 * All Rights Reserved.  Use is subject to license terms.
 * 
 * Permission is hereby granted, free of charge, to use and distribute
 * this software and its documentation without restriction, including
 * without limitation the rights to use, copy, modify, merge, publish,
 * distribute, sublicense, and/or sell copies of this work, and to
 * permit persons to whom this work is furnished to do so, subject to
 * the following conditions:
 * 
 * 1. The code must retain the above copyright notice, this list of
 *    conditions and the following disclaimer.
 * 2. Any modifications must be clearly marked as such.
 * 3. Original authors' names are not deleted.
 * 4. The authors' names are not used to endorse or promote products
 *    derived from this software without specific prior written
 *    permission.
 *
 * DFKI GMBH AND THE CONTRIBUTORS TO THIS WORK DISCLAIM ALL WARRANTIES WITH
 * REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL DFKI GMBH NOR THE
 * CONTRIBUTORS BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL
 * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
 * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
 * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF
 * THIS SOFTWARE.
 */
package marytts.unitselection.select.viterbi;

import java.util.ArrayList;
import java.util.List;

import marytts.unitselection.select.Target;

/**
 * Represents a point in the Viterbi path. A point corresponds to an item, e.g. a Segment. Each ViterbiPoint knows about its next
 * ViterbiPoint, i.e. they can form a queue.
 */
public class ViterbiPoint {
	Target target = null;
	List candidates = null;
	List paths = new ArrayList();
	ViterbiPoint next = null;

	/**
	 * Creates a ViterbiPoint for the given target.
	 *
	 * @param target
	 *            the target of interest
	 */
	public ViterbiPoint(Target target) {
		this.target = target;
	}

	/**
	 * Gets the target of this point
	 * 
	 * @return the target
	 */
	public Target getTarget() {
		return target;
	}

	/**
	 * Sets the target of this point
	 * 
	 * @param target
	 *            the new target
	 */
	public void setTarget(Target target) {
		this.target = target;
	}

	/**
	 * Gets the candidates of this point
	 * 
	 * @return the candidates
	 */
	public List getCandidates() {
		return candidates;
	}

	/**
	 * Sets the candidates of this point
	 * 
	 * @param candidates
	 *            the candidates
	 */
	public void setCandidates(ArrayList candidates) {
		this.candidates = candidates;
	}

	/**
	 * Gets the sorted set containting the paths of the candidates of this point, sorted by score. getPaths().first() will return
	 * the path with the lowest score, i.e. the best path.
	 * 
	 * @return a sorted set.
	 */
	public List getPaths() {
		return paths;
	}

	/**
	 * Gets the next point in the queue
	 * 
	 * @return the next point
	 */
	public ViterbiPoint getNext() {
		return next;
	}

	/**
	 * Sets the next point in the queue
	 * 
	 * @param next
	 *            the next point
	 */
	public void setNext(ViterbiPoint next) {
		this.next = next;
	}

	public String toString() {
		return "ViterbiPoint: target " + target + "; " + paths.size() + " paths";
	}
}