simtypep.java

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/* Sim_type_p.java
 */

package jmt.engine.simEngine;


/**
 * A predicate to select events with specific tags from the deferred
 * event queue.
 * @see         eduni.simjava.Sim_predicate
 * @version     1.0, 4 September 1996
 * @author      Ross McNab
 */

public class SimTypeP extends SimPredicate {
	private int tag1,tag2,tag3;
	private int ntags;

	/** Constructor.
	 * @param t1   An event tag value
	 */
	public SimTypeP(int t1) {
		tag1 = t1;
		ntags = 1;
	}

	/** Constructor.
	 * @param t1   An event tag value
	 * @param t2   An event tag value
	 */
	public SimTypeP(int t1, int t2) {
		tag1 = t1;
		tag2 = t2;
		ntags = 2;
	}

	/** Constructor.
	 * @param t1   An event tag value
	 * @param t2   An event tag value
	 * @param t3   An event tag value
	 */
	public SimTypeP(int t1, int t2, int t3) {
		tag1 = t1;
		tag2 = t2;
		tag3 = t3;
		ntags = 3;
	}

	/** The match function called by SimSystem.simSelect(),
	 * not used directly by the user
	 */
	public boolean match(SimEvent ev) {
		switch (ntags) {
			case 1:
				return (ev.getTag() == tag1);
			case 2:
				return (ev.getTag() == tag1) || (ev.getTag() == tag2);
			case 3:
				return (ev.getTag() == tag1) || (ev.getTag() == tag2) ||
				        (ev.getTag() == tag3);
		}
		return false;
	}
}