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diff --git a/src/javax/media/j3d/J3dStructure.java b/src/javax/media/j3d/J3dStructure.java
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+/*
+ * Copyright 1998-2008 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;
+
+
+/**
+ * The J3dStructure is the super class of all structures in Java 3D.
+ * A structure is a object that organizes a collection of objects.
+ */
+
+abstract class J3dStructure extends Object {
+    /**
+     * This is the list of messages to be processed by this structure
+     */
+    UnorderList messageList = new UnorderList(5, J3dMessage.class);
+
+    /**
+     * This is the update Thread for this structure
+     */
+
+    StructureUpdateThread updateThread = null;
+
+    /**
+     * This is the type of update thread
+     */
+    int threadType = -1;
+
+    /**
+     * The universe of this structure
+     */
+    VirtualUniverse universe = null;
+
+    /**
+     * The thread data for the update thread
+     */
+    J3dThreadData threadData = new J3dThreadData();
+
+    /**
+     * number of messages for this snapshot of time
+     */
+    int nMessage = 0;
+    J3dMessage[] msgList = new J3dMessage[5];
+
+    /**
+     * This constructor does nothing
+     */
+    J3dStructure(VirtualUniverse u, int type) {
+	universe = u;
+	threadType = type;
+	threadData.threadType = type;
+    }
+
+    /**
+     * This returns the thread data for this thread.
+     */
+    final J3dThreadData getUpdateThreadData() {
+	return (threadData);
+    }
+
+    /**
+     * This adds a message to the list of messages for this structure
+     */
+    final void addMessage(J3dMessage message) {
+
+	if (threadData != null) {
+	    threadData.lastUpdateTime = message.time;
+	} else {
+	    // this force message to consume when initialized
+	    message.time = -1;
+	}
+	message.incRefcount();
+	messageList.add(message);
+    }
+
+
+    /**
+     * This returns whether or not there are any pending messages
+     */
+    final J3dMessage[] getMessages(long referenceTime) {
+	int sz, n = 0;
+
+	synchronized (messageList) {
+	    if ((sz = messageList.size()) > 0) {
+		J3dMessage mess[] = (J3dMessage []) messageList.toArray(false);
+		for (n = 0; n < sz; n++) {
+		    if (mess[n].time > referenceTime) {
+			break;
+		    }
+		}
+		if (n > 0) {
+		    if (msgList.length < n) {
+			msgList = new J3dMessage[n];
+		    }
+		    messageList.shift(msgList, n);
+		}
+	    }
+	}
+
+	nMessage = n;
+	return msgList;
+    }
+
+    final void clearMessages() {
+	synchronized (messageList) {
+            int nmessage = messageList.size();
+	    if (nmessage > 0) {
+		J3dMessage mess[] = (J3dMessage []) messageList.toArray(false);
+		for (int i = nmessage-1; i >=0; i--) {
+		    mess[i].decRefcount();
+		}
+		messageList.clear();
+	    }
+	    nMessage = 0;
+	    msgList = new J3dMessage[5];
+	}
+
+    }
+
+    int  getNumMessage() {
+	return nMessage;
+    }
+
+    /**
+     * This gets overriden by the structure
+     */
+    abstract void processMessages(long referenceTime);
+
+    /**
+     * This is used by MasterControl to process any unused message
+     * for final cleanup. DON'T decrememt message count in
+     * the method, as it is done by MasterControl.
+     */
+    abstract void removeNodes(J3dMessage m);
+
+    /**
+     * Release resource associate with this structure before GC
+     * We need to clear all those IndexedUnorderSet/WakeupIndexedList
+     * so that the listIdx associate with IndexedObject reset to -1.
+     */
+    abstract void cleanup();
+}