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diff --git a/src/javax/media/j3d/WakeupOnActivation.java b/src/javax/media/j3d/WakeupOnActivation.java
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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;
+
+/**
+ * Class specifying a wakeup the first time an active Viewplatform's
+ * activation
+ * volume intersects with this object's scheduling region.
+ * This gives the behavior an explicit means of executing code when
+ * it is activated.
+ */
+public final class WakeupOnActivation 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;
+
+    /**
+     * Constructs a new WakeupOnActivation criterion.
+     */
+    public WakeupOnActivation() {
+	WakeupIndexedList.init(this, TOTAL_INDEXED_UNORDER_SET_TYPES);
+    }
+
+    /**
+     * This is a callback from BehaviorStructure. It is
+     * used to add wakeupCondition to behavior structure.
+     */
+    @Override
+    void addBehaviorCondition(BehaviorStructure bs) {
+	behav.wakeupArray[BehaviorRetained.WAKEUP_ACTIVATE_INDEX]++;
+	behav.wakeupMask |= BehaviorRetained.WAKEUP_ACTIVATE;
+	bs.wakeupOnActivation.add(this);
+    }
+
+
+    /**
+     * This is a callback from BehaviorStructure. It is
+     * used to remove wakeupCondition from behavior structure.
+     */
+    @Override
+    void removeBehaviorCondition(BehaviorStructure bs) {
+	behav.wakeupArray[BehaviorRetained.WAKEUP_ACTIVATE_INDEX]--;
+	if (behav.wakeupArray[BehaviorRetained.WAKEUP_ACTIVATE_INDEX] == 0) {
+	    behav.wakeupMask &= ~BehaviorRetained.WAKEUP_ACTIVATE;
+	}
+	bs.wakeupOnActivation.remove(this);
+    }
+
+    /**
+     * Perform task in addBehaviorCondition() that has to be
+     * set every time the condition met.
+     */
+    @Override
+    void resetBehaviorCondition(BehaviorStructure bs) {}
+}