Package org.web3d.vrml.renderer

Class ProtoCopier

java.lang.Object

org.web3d.vrml.renderer.ProtoCopier

All Implemented Interfaces:

SceneGraphTraversalSimpleObserver

public class ProtoCopier
extends Object
implements SceneGraphTraversalSimpleObserver

A class that is used to create real instances of protos from their definitions.

The creator strips the definition apart and builds a runtime node based on the details and the node factory provided. The creator can handle one instance at a time, although it will correctly parse and build nested proto declarations without extra effort.

We have a small conundrum to deal with - if the proto definition contains SF/MFNode fields, we don't know whether the values should be also generated as real runtime nodes too. Maybe the usage of this node will provide values that are dealt with after this class has finished. Other times, these default values must be used. For this implementation, we have gone with the safety-first approach: Always parse the definition of any SF or MFNode field and turn those into runtime instances. Although this may create extra garbage, there seems to be no nice way of dealing with this issue without a completely different architecture for the library.

Note: Under the current implementation, EXTERNPROTOs are not yet catered for.

Version:

$Revision: 1.24 $

Author:

Justin Couch

Constructor Summary

Constructors

Constructor	Description
ProtoCopier(VRMLNodeFactory fac, String worldURL)	Create a new copier that uses the given world URL and node factory.

Method Summary

Modifier and Type	Method	Description
void	observedNode(VRMLNodeType parent, VRMLNodeType child, int field, boolean used)	Notification of a child node.
void	protoNode(VRMLNodeType parent, CRProtoInstance proto)	Notification of a completed proto instance that needs to be registered with its parent node.
void	setErrorReporter(org.j3d.util.ErrorReporter reporter)	Register an error reporter with the engine so that any errors generated by the script code can be reported in a nice, pretty fashion.
void	setFrameStateManager(FrameStateManager fsm)	Set the frame state manager to use for the builder after this point.

Methods inherited from class java.lang.Object

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

Constructor Details

ProtoCopier

public ProtoCopier(VRMLNodeFactory fac,
 String worldURL)

Create a new copier that uses the given world URL and node factory.

Parameters:

fac - The factory to use (Must generate VRMLNodeType instances)

worldURL -

Method Details

setFrameStateManager

public void setFrameStateManager(FrameStateManager fsm)

Set the frame state manager to use for the builder after this point. Set a value of null it will clear the currently set items.

Parameters:

fsm - The state manager to use

setErrorReporter

public void setErrorReporter(org.j3d.util.ErrorReporter reporter)

Register an error reporter with the engine so that any errors generated by the script code can be reported in a nice, pretty fashion. Setting a value of null will clear the currently set reporter. If one is already set, the new value replaces the old.

Parameters:

reporter - The instance to use or null

observedNode

public void observedNode(VRMLNodeType parent,
 VRMLNodeType child,
 int field,
 boolean used)

Notification of a child node.

Specified by:

observedNode in interface SceneGraphTraversalSimpleObserver

Parameters:

parent - The parent node of this node

child - The child node that is being observed

field - The index of the child field in its parent node

used - true if the node reference is actually a USE

protoNode

public void protoNode(VRMLNodeType parent,
 CRProtoInstance proto)

Notification of a completed proto instance that needs to be registered with its parent node.

Parameters:

parent - The parent node of this node

proto - The proto node that has been found