edge.java

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/*
 * Copyright 1999-2002 Carnegie Mellon University.
 * Portions Copyright 2002 Sun Microsystems, Inc.
 * Portions Copyright 2002 Mitsubishi Electric Research Laboratories.
 * All Rights Reserved.  Use is subject to license terms.
 *
 * See the file "license.terms" for information on usage and
 * redistribution of this file, and for a DISCLAIMER OF ALL
 * WARRANTIES.
 *
 */

package edu.cmu.sphinx.trainer;

/**
 * Defines the basic Edge for any graph
 * A generic graph edge must have a destination Node
 * and an identifier.
 */

public class Edge {
    /**
     * The identifier for this edge
     */
    public String id;

    /**
     * The source node for this edge
     */
    public Node sourceNode;

    /**
     * The destination node for this edge
     */
    public Node destinationNode;

    /*
     * Default Constructor
     */
    Edge(Node source, Node destination, String id) {
        this.sourceNode = source;
        this.destinationNode = destination;
	this.id = id;
    }

    /*
     * Constructor given no id.
     */
    Edge(Node source, Node destination) {
	this(source, destination, (String) null);
    }

    /**
     * Sets the destination node for a given edge.
     *
     * @param node the destination node for this edge
     *
     * @see #getDestination
     */
    public void setDestination(Node node) {
	this.destinationNode = node;
    }

    /**
     * Sets source node for a given edge.
     *
     * @param node the source node for this edge
     *
     * @see #getSource
     */
    public void setSource(Node node) {
	this.sourceNode = node;
    }

    /**
     * Gets the destination node for a given edge.
     *
     * @return the destination node
     *
     * @see #setDestination
     */
    public Node getDestination() {
	return destinationNode;
    }

    /**
     * Gets source node for a given edge.
     *
     * @return the source node
     *
     * @see #setSource
     */
    public Node getSource() {
	return sourceNode;
    }

    /**
     * Validate this edge. Checks if source and destination are
     * non-null.
     *
     * @return if true, edge passed validation
     */
    public boolean validate() {
	return ((sourceNode != null) && (destinationNode != null));
    }

    /**
     * Prints out this edge.
     */
    public void print() {
	System.out.print("ID: " + id);
	System.out.print(" | " + sourceNode);
	System.out.println(" | " + destinationNode);
    }
}