/* * $RCSfile: LOD.java,v $ * * Copyright (c) 2007 Sun Microsystems, Inc. All rights reserved. * * Use is subject to license terms. * * $Revision: 1.4 $ * $Date: 2007/02/09 17:18:08 $ * $State: Exp $ */package javax.media.j3d;import java.util.Enumeration;import java.util.Vector;/** * An LOD leaf node is an abstract behavior class that operates on * a list of Switch group nodes to select one of the children of the * Switch nodes. * The LOD class is extended to implement various selection criteria. */public abstract class LOD extends Behavior {    /**     * Wakeup condition for all LOD nodes     */    WakeupOnElapsedFrames wakeupFrame = new WakeupOnElapsedFrames(0, true);    /**     * The LOD Node's vector of switch nodes.     */    Vector switches = new Vector(5);    /**     * Constructs and initializes an LOD node.     */    public LOD() {    }    /**     * Appends the specified switch node to this LOD's list of switches.     * @param switchNode the switch node to add to this LOD's list of switches     */    public void addSwitch(Switch switchNode) {	switches.addElement(switchNode);    }    /**     * Replaces the specified switch node with the switch node provided.     * @param switchNode the new switch node     * @param index which switch node to replace     */    public void setSwitch(Switch switchNode, int index) {	Switch sw = getSwitch(index);	switches.setElementAt(switchNode, index);    }    /**     * Inserts the specified switch node at specified index.     * @param switchNode the new switch node     * @param index position to insert new switch node at     */    public void insertSwitch(Switch switchNode, int index) {	switches.insertElementAt(switchNode, index);    }    /**     * Removes the switch node at specified index.     * @param index which switch node to remove     */    public void removeSwitch(int index) {	Switch sw = getSwitch(index);	switches.removeElementAt(index);    }    /**     * Returns the switch node specified by the index.     * @param index which switch node to return     * @return the switch node at location index     */    public Switch getSwitch(int index) {	return (Switch) switches.elementAt(index);    }    /**     * Returns the enumeration object of all switches.     * @return the enumeration object of all switches     */      public Enumeration getAllSwitches() {        return switches.elements();    }    /**     * Returns a count of this LOD's switches.     * @return the number of switches controlled by this LOD     */    public int numSwitches() {	return switches.size();    }    /**     * Retrieves the index of the specified switch node in     * this LOD node's list of switches.     *     * @param switchNode the switch node to be looked up.     * @return the index of the specified switch node;     * returns -1 if the object is not in the list.     *     * @since Java 3D 1.3     */    public int indexOfSwitch(Switch switchNode) {	return switches.indexOf(switchNode);    }    /**     * Removes the specified switch node from this LOD node's     * list of switches.     * If the specified object is not in the list, the list is not modified.     *     * @param switchNode the switch node to be removed.     *     * @since Java 3D 1.3     */    public void removeSwitch(Switch switchNode) {	int index = switches.indexOf(switchNode);	if (index >= 0)	    removeSwitch(index);    }    /**     * Removes all switch nodes from this LOD node.     *     * @since Java 3D 1.3     */    public void removeAllSwitches() {	int numSwitches = switches.size();	// Remove in reverse order to ensure valid indices	for (int index = numSwitches - 1; index >= 0; index--) {	    removeSwitch(index);	}    }    /**     * Copies all LOD information from     * <code>originalNode</code> into     * the current node.  This method is called from the     * <code>cloneNode</code> method which is, in turn, called by the     * <code>cloneTree</code> method.<P>      *     * @param originalNode the original node to duplicate.     * @param forceDuplicate when set to <code>true</code>, causes the     *  <code>duplicateOnCloneTree</code> flag to be ignored.  When     *  <code>false</code>, the value of each node's     *  <code>duplicateOnCloneTree</code> variable determines whether     *  NodeComponent data is duplicated or copied.     *     * @exception RestrictedAccessException if this object is part of a live     *  or compiled scenegraph.     *     * @see Node#duplicateNode     * @see Node#cloneTree     * @see NodeComponent#setDuplicateOnCloneTree     */    void duplicateAttributes(Node originalNode, boolean forceDuplicate) {        super.duplicateAttributes(originalNode, forceDuplicate);		LOD lod = (LOD) originalNode;        int numSwitch = lod.numSwitches();        for (int i = 0; i < numSwitch; i++) {            addSwitch(lod.getSwitch(i));        }    }    /**     * Callback used to allow a node to check if any nodes referenced     * by that node have been duplicated via a call to <code>cloneTree</code>.     * This method is called by <code>cloneTree</code> after all nodes in     * the sub-graph have been duplicated. The cloned Leaf node's method     * will be called and the Leaf node can then look up any node references     * by using the <code>getNewObjectReference</code> method found in the     * <code>NodeReferenceTable</code> object.  If a match is found, a     * reference to the corresponding Node in the newly cloned sub-graph     * is returned.  If no corresponding reference is found, either a     * DanglingReferenceException is thrown or a reference to the original     * node is returned depending on the value of the     * <code>allowDanglingReferences</code> parameter passed in the     * <code>cloneTree</code> call.     * <p>     * NOTE: Applications should <i>not</i> call this method directly.     * It should only be called by the cloneTree method.     *     * @param referenceTable a NodeReferenceTableObject that contains the     *  <code>getNewObjectReference</code> method needed to search for     *  new object instances.     * @see NodeReferenceTable     * @see Node#cloneTree     * @see DanglingReferenceException     */    public void updateNodeReferences(NodeReferenceTable referenceTable) {       int numSwitch = numSwitches();       for (int i = 0; i < numSwitch; i++) {	   Switch curSwitch = getSwitch(i);	   if (curSwitch != null) {	       setSwitch((Switch)			 referenceTable.getNewObjectReference(curSwitch), i);	   }       }    }}