javax.media.j3d
Class SceneGraphObject

java.lang.Object
  |
  +--javax.media.j3d.SceneGraphObject

Direct Known Subclasses:

Node, NodeComponent

public abstract class SceneGraphObject

extends java.lang.Object

SceneGraphObject is a common superclass for all scene graph component objects. This includes Node, Geometry, Appearance, etc.

Constructor Summary

SceneGraphObject()
Constructs a SceneGraphObject with default parameters.

Method Summary

void	clearCapability(int bit) Clear the specified capability bit.
protected void	duplicateSceneGraphObject(SceneGraphObject originalNode) Copies all SceneGraphObject information from originalNode into the current node.
boolean	getCapability(int bit) Retrieves the specified capability bit.
java.lang.Object	getUserData() Retrieves the userData field from this scene graph object.
boolean	isCompiled() Returns a flag indicating whether the node is part of a scene graph that has been compiled.
boolean	isLive() Returns a flag indicating whether the node is part of a live scene graph.
void	setCapability(int bit) Sets the specified capability bit.
void	setUserData(java.lang.Object userData) Sets the userData field associated with this scene graph object.
void	updateNodeReferences(NodeReferenceTable referenceTable) Callback used to allow a node to check if any scene graph objects referenced by that node have been duplicated via a call to cloneTree.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

SceneGraphObject

public SceneGraphObject()

Constructs a SceneGraphObject with default parameters. The default values are as follows:

capability bits : clear (all bits)
isLive : false
isCompiled : false
user data : null

Method Detail

getCapability

public final boolean getCapability(int bit)

Retrieves the specified capability bit. Note that only one capability bit may be retrieved per method invocation--capability bits cannot be ORed together.

Parameters:

bit - the bit whose value is returned

Returns:

true if the bit is set, false if the bit is clear

setCapability

public final void setCapability(int bit)

Sets the specified capability bit. Note that only one capability bit may be set per method invocation--capability bits cannot be ORed together.

Parameters:

bit - the bit to set

Throws:

RestrictedAccessException - if this object is part of live or compiled scene graph

clearCapability

public final void clearCapability(int bit)

Clear the specified capability bit. Note that only one capability bit may be cleared per method invocation--capability bits cannot be ORed together.

Parameters:

bit - the bit to clear

Throws:

RestrictedAccessException - if this object is part of live or compiled scene graph

isCompiled

public final boolean isCompiled()

Returns a flag indicating whether the node is part of a scene graph that has been compiled. If so, then only those capabilities explicitly allowed by the object's capability bits are allowed.

Returns:

true if node is part of a compiled scene graph, else false

isLive

public final boolean isLive()

Returns a flag indicating whether the node is part of a live scene graph.

Returns:

true if node is part of a live scene graph, else false

setUserData

public void setUserData(java.lang.Object userData)

Sets the userData field associated with this scene graph object. The userData field is a reference to an arbitrary object and may be used to store any user-specific data associated with this scene graph object--it is not used by the Java 3D API. If this object is cloned, the userData field is copied to the newly cloned object.

Parameters:

userData - a reference to the new userData field

getUserData

public java.lang.Object getUserData()

Retrieves the userData field from this scene graph object.

Returns:

the current userData field

updateNodeReferences

public void updateNodeReferences(NodeReferenceTable referenceTable)

Callback used to allow a node to check if any scene graph objects referenced by that node have been duplicated via a call to cloneTree. This method is called by cloneTree after all nodes in the sub-graph have been duplicated. The cloned Leaf node and cloned NodeComponent's method will be called and the Leaf node/NodeComponent can then look up any object references by using the getNewObjectReference method found in the NodeReferenceTable object. If a match is found, a reference to the corresponding object 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 object is returned depending on the value of the allowDanglingReferences parameter passed in the cloneTree call.

NOTE: Applications should not call this method directly. It should only be called by the cloneTree method.

Parameters:

referenceTable - a NodeReferenceTableObject that contains the getNewObjectReference method needed to search for new object instances.

See Also:

NodeReferenceTable, Node.cloneTree(), DanglingReferenceException

duplicateSceneGraphObject

protected void duplicateSceneGraphObject(SceneGraphObject originalNode)

Copies all SceneGraphObject information from originalNode into the current node. This method is called from the cloneNode method which is, in turn, called by the cloneTree method.

NOTE: Applications should not call this method directly. It should only be called by the cloneNode method.

Parameters:

originalNode - the original node to duplicate.

forceDuplicate - when set to true, causes the duplicateOnCloneTree flag to be ignored. When false, the value of each node's duplicateOnCloneTree variable determines whether NodeComponent data is duplicated or copied.

See Also:

Group.cloneNode(boolean), Node.duplicateNode(javax.media.j3d.Node, boolean), Node.cloneTree(), NodeComponent.setDuplicateOnCloneTree(boolean)