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+/*
+ * Copyright 1997-2008 Sun Microsystems, Inc.  All Rights Reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.  Sun designates this
+ * particular file as subject to the "Classpath" exception as provided
+ * by Sun in the LICENSE file that accompanied this code.
+ *
+ * This code 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 General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
+ * CA 95054 USA or visit www.sun.com if you need additional information or
+ * have any questions.
+ *
+ */
+
+package javax.media.j3d;
+
+/**
+ * An abstract class specifying a singleton wakeup Criterion. This
+ * class consists of several subclasses, each of which specifies one
+ * particular wakeup criterion, that criterion's associated arguments
+ * (if any), and either a flag that indicates whether this criterion
+ * caused a Behavior object to awaken or a return field containing the
+ * information that caused the Behavior object to awaken.
+ * <p>
+ * Note that a unique WakeupCriterion object must be used with each instance
+ * of a Behavior. Sharing wakeup criteria among different instances of
+ * a Behavior is illegal.  Similarly, a unique WakeupCriterion object
+ * must be used for each individual element in the set of arrays used
+ * to construct WakeupOr, WakeupAnd, WakeupOrOfAnds, and
+ * WakeupAndOfOrs objects.
+ */
+
+public abstract class WakeupCriterion extends WakeupCondition {
+
+    /**
+     * Flag specifying whether this criterion triggered a wakeup
+     */
+    boolean triggered;
+
+    /**
+     * Returns true if this criterion triggered the wakeup.
+     * @return true if this criterion triggered the wakeup.
+     */
+    public boolean hasTriggered(){
+	return this.triggered;
+    }
+
+    /**
+     * Set the Criterion's trigger flag to true.
+     */
+    void setTriggered(){
+	this.triggered = true;
+	if (this.parent == null) {
+	    super.setConditionMet(id, Boolean.TRUE);
+	} else {
+	    parent.setConditionMet(id, Boolean.TRUE);
+	}
+    }
+
+    /**
+     * Initialize And/Or tree and add criterion to the BehaviourStructure.
+     *
+     */
+    @Override
+    void buildTree(WakeupCondition parent, int id, BehaviorRetained b) {
+	super.buildTree(parent, id, b);
+	triggered = false;
+	addBehaviorCondition(b.universe.behaviorStructure);
+    }
+
+
+    /**
+     * This goes through the AndOr tree to remove the various criterion from the
+     * BehaviorStructure.
+     * We can't use  behav.universe.behaviorStructure since behav
+     * may reassign to another universe at this time.
+     *
+     */
+    @Override
+    void cleanTree(BehaviorStructure bs){
+	conditionMet = false;
+	removeBehaviorCondition(bs);
+    };
+
+
+    /**
+     * This goes through the AndOr tree to reset various criterion.
+     */
+    @Override
+    void resetTree() {
+	conditionMet = false;
+	triggered = false;
+	resetBehaviorCondition(behav.universe.behaviorStructure);
+    }
+
+    /**
+     * This is a callback from BehaviorStructure. It is
+     * used to add wakeupCondition to behavior structure.
+     */
+    abstract void addBehaviorCondition(BehaviorStructure bs);
+
+
+    /**
+     * This is a callback from BehaviorStructure. It is
+     * used to remove wakeupCondition from behavior structure.
+     */
+    abstract void removeBehaviorCondition(BehaviorStructure bs);
+
+    /**
+     * It is used reset wakeupCondition when it is reused.
+     */
+    abstract void resetBehaviorCondition(BehaviorStructure bs);
+}