/*
 * $RCSfile: WakeupOnBehaviorPost.java,v $
 *
 * Copyright (c) 2007 Sun Microsystems, Inc. All rights reserved.
 *
 * Use is subject to license terms.
 *
 * $Revision: 1.4 $
 * $Date: 2007/02/09 17:18:30 $
 * $State: Exp $
 */

package javax.media.j3d;

/**
 * Class that specifies a Behavior wakeup when a specific behavior object
 * posts a specific event
 */
public final class WakeupOnBehaviorPost extends WakeupCriterion {

    // different types of WakeupIndexedList that use in BehaviorStructure
    static final int COND_IN_BS_LIST = 0;

    // total number of different IndexedUnorderedSet types
    static final int TOTAL_INDEXED_UNORDER_SET_TYPES = 1;

    Behavior armingBehavior, triggeringBehavior;
    int post, triggeringPost;


    /**
     * Constructs a new WakeupOnBehaviorPost criterion.  A behavior of null
     * specifies a wakeup from any behavior on the specified postId. A postId
     * of 0 specifies a wakeup on any postId from the specified behavior. 
     * A behavior of null AND a postId of 0 specify a wakeup on any postId
     * from any behavior.
     * @param behavior the behavior that must be the source of the post, 
     * if behavior == null, then any behavior posting the postId will cause
     * the wakeup.
     * @param postId the postId that will trigger a wakeup if posted by the
     * specified behavior, if postId == 0, then any post by the specified
     * behavior will cause the wakeup.
     */
    public WakeupOnBehaviorPost(Behavior behavior, int postId) {
	this.armingBehavior = behavior;
	this.post = postId;
	triggeringPost = -1;
	triggeringBehavior = null;
	WakeupIndexedList.init(this, TOTAL_INDEXED_UNORDER_SET_TYPES);
    }
    
    /**
     * Retrieve the WakeupCriterion's specified postId
     * @return the post id specified in this object's construction.
     */
    public int getPostId(){
	return post;
    }


    /**
     *  Returns the behavior specified in this object's constructor.
     *  @return the arming behavior
     */
    public Behavior getBehavior () {
	return armingBehavior;
    }


    /**
     *  Returns the postId that caused the behavior to wakeup.  If the postId
     *  used to construct this wakeup criterion was not zero, then the 
     *  triggering postId will always be equal to the postId used in the 
     *  constructor.
     */
    public int getTriggeringPostId() {
	return triggeringPost;
    }


    /**
     *  Returns the behavior that triggered this wakeup.  If the arming 
     *  behavior used to construct this object was not null, then the 
     *  triggering behavior will be the same as the arming behavior.
     */
    public Behavior getTriggeringBehavior() {
	return triggeringBehavior;
    }

 
    /**
     * This is a callback from BehaviorStructure. It is 
     * used to add wakeupCondition to behavior structure.
     */
    void addBehaviorCondition(BehaviorStructure bs) {
	bs.wakeupOnBehaviorPost.add(this);
    }


    /**
     * This is a callback from BehaviorStructure. It is 
     * used to remove wakeupCondition from behavior structure.
     */
    void removeBehaviorCondition(BehaviorStructure bs) {
	bs.wakeupOnBehaviorPost.remove(this);
    }

    /**
     * Perform task in addBehaviorCondition() that has to be
     * set every time the condition met.
     */
    void resetBehaviorCondition(BehaviorStructure bs) {}
}
