de.grogra.imp3d.io

Class SceneGraphExport

java.lang.Object

de.grogra.pf.io.FilterBase

de.grogra.imp3d.io.SceneGraphExport

All Implemented Interfaces:

SceneTree.Visitor, Filter, FilterSource, RegistryContext, Map

Direct Known Subclasses:

MTGExport, STLExport, WebGLExport, X3DExport

public abstract class SceneGraphExport
extends FilterBase
implements SceneTree.Visitor

This base class is used to export the 3D scene graph of a View3D to another representation (usually, this is a file representation for which this class provides a set of useful methods). The export is done via the creation of an intermediate SceneTree in the method createSceneTree(View3D).

Author:

Ole Kniemeyer

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static interface	SceneGraphExport.NodeExport This interface is used to export a leaf of the SceneTree to the destination.
static interface	SceneGraphExport.ObjectExport This interface is used to export an object (as an attribute of a node of the scene tree) to the destination.

Nested classes/interfaces inherited from interface de.grogra.pf.io.FilterSource

FilterSource.MetaDataKey<V>

Nested classes/interfaces inherited from interface de.grogra.util.Map

Map.Chain

Field Summary

Fields

Modifier and Type	Field and Description
protected ObjectList	files The list of files which have been created by this export.

Fields inherited from class de.grogra.pf.io.FilterBase

item, source

Fields inherited from interface de.grogra.pf.io.FilterSource

AUTO_PROGRESS, DESTINATION_FILE, DESTINATION_URL

Fields inherited from interface de.grogra.util.Map

DEFAULT_VALUE, EMPTY_MAP

Constructor Summary

Constructors

Constructor and Description
SceneGraphExport(FilterItem item, FilterSource source) Delegates to FilterBase.FilterBase(FilterItem, FilterSource).

Method Summary

Methods

Modifier and Type	Method and Description
protected abstract void	beginGroup(SceneTree.InnerNode group) This method is invoked at the beginning of every inner node group which has more than one child.
protected abstract SceneTree	createSceneTree(View3D scene) The implementation of this method creates the scene tree which is to be exported by this export.
protected abstract void	endGroup(SceneTree.InnerNode group) This method is invoked at the end of every inner node group which has more than one child.
boolean	export(java.lang.Object object) This method is invoked for some attribute value in order to export the value.
protected void	export(SceneTree.Leaf node, SceneTree.InnerNode transform) This method is invoked for every leaf of the scene tree in order to export this leaf.
java.lang.Object	getDirectory() This method returns the base directory within getFileSystem() to use for the export.
SceneGraphExport.NodeExport	getExportFor(java.lang.Object object, boolean asNode) This method is used to obtain an instance of NodeExport capable of exporting the object of a SceneTree.Leaf.
SceneGraphExport.ObjectExport	getExportForObject(java.lang.Object object) This method is used to obtain an instance of ObjectExport capable of exporting the object (which is some attribute value).
java.lang.Object	getFile(java.lang.String name) This method creates a file in getDirectory().
java.util.Collection	getFiles() Returns the list of files which have been created during export.
FileSystem	getFileSystem() This method returns the file system to use for the export.
GraphState	getGraphState() Returns the graph state which is used for export.
java.io.OutputStream	getOutputStream(java.lang.Object file)
java.lang.String	getPath(FileObjectItem file)
java.lang.String	getPath(java.lang.Object file) Returns the path of a file of this export's file system (getFileSystem()) as a string.
View3D	getView() Returns the view which defines the scene to export.
protected java.lang.Object	initDirectory() Determines the directory to use.
protected FileSystem	initFileSystem() Determines the file system to use.
void	visit(SceneTree.Leaf leaf) Informs the visitor that a leaf is visited.
void	visitEnter(SceneTree.InnerNode node) Informs the visitor that an inner node has been entered.
void	visitLeave(SceneTree.InnerNode node) Informs the visitor that an inner node has been left.
protected void	write() Exports the scene of the view.

Methods inherited from class de.grogra.pf.io.FilterBase

get, getFilter, getFlavor, getImpl, getMetaData, getRegistry, getSource, getSystemId, initProgressMonitor, setFlavor, setMetaData, setMetaData, setProgress, setSystemId, toString, toURL

Methods inherited from class java.lang.Object

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

Field Detail

files

protected ObjectList files

The list of files which have been created by this export.

Constructor Detail

SceneGraphExport

public SceneGraphExport(FilterItem item,
                FilterSource source)

Delegates to FilterBase.FilterBase(FilterItem, FilterSource). The source is expected to be an ObjectSource representing an instance of View3D.

Parameters:

item - the defining FilterItem

source - the data source

Method Detail

beginGroup

protected abstract void beginGroup(SceneTree.InnerNode group)
                            throws java.io.IOException

This method is invoked at the beginning of every inner node group which has more than one child. Its children will be processed until the corresponding method endGroup(de.grogra.imp3d.objects.SceneTree.InnerNode) is invoked. The export should write the hierarchy and transformation information of the group.

Parameters:

group - the group

Throws:

java.io.IOException

createSceneTree

protected abstract SceneTree createSceneTree(View3D scene)

The implementation of this method creates the scene tree which is to be exported by this export.

Parameters:

scene - the view which defines the scene to export

Returns:

scene tree for the view

endGroup

protected abstract void endGroup(SceneTree.InnerNode group)
                          throws java.io.IOException

This method is invoked at the end of every inner node group which has more than one child. Its children have been processed completely.

Parameters:

group - the group

Throws:

java.io.IOException

See Also:

beginGroup(de.grogra.imp3d.objects.SceneTree.InnerNode)

export

public boolean export(java.lang.Object object)
               throws java.io.IOException

This method is invoked for some attribute value in order to export the value.

This implementation obtains an SceneGraphExport.ObjectExport via getExportForObject(Object) and, if successful, uses this to export the value.

Parameters:

object - object to export

Throws:

java.io.IOException

export

protected void export(SceneTree.Leaf node,
          SceneTree.InnerNode transform)
               throws java.io.IOException

This method is invoked for every leaf of the scene tree in order to export this leaf. If transform is non-null, this means that node is the only child of transform and the transformation of transform has to be exported together with the node.

This implementation obtains a SceneGraphExport.NodeExport via getExportFor(Object, boolean) and, if successful, uses this to export the leaf.

Parameters:

node - a leaf of the scene tree

transform - transformation of node

Throws:

java.io.IOException

See Also:

beginGroup(de.grogra.imp3d.objects.SceneTree.InnerNode), endGroup(de.grogra.imp3d.objects.SceneTree.InnerNode)

getDirectory

public java.lang.Object getDirectory()
                              throws java.io.IOException

This method returns the base directory within getFileSystem() to use for the export. On first invocation, the directory is obtained from initDirectory().

Returns:

directory to use for export

Throws:

java.io.IOException

getExportFor

public SceneGraphExport.NodeExport getExportFor(java.lang.Object object,
                                       boolean asNode)

This method is used to obtain an instance of NodeExport capable of exporting the object of a SceneTree.Leaf. If no such export is defined, null is returned.

This implementation looks for an export defined in the registry: As name, the name of the class of object is chosen, the export is searched as a child of FilterBase.item.

Parameters:

object - object of the original scene graph

asNode - is object a node or an edge?

Returns:

suitable export for the object or null

getExportForObject

public SceneGraphExport.ObjectExport getExportForObject(java.lang.Object object)

This method is used to obtain an instance of ObjectExport capable of exporting the object (which is some attribute value). If no such export is defined, null is returned.

This implementation looks for an export defined in the registry: As name, the name of the class of object is chosen, the export is searched as a child of FilterBase.item.

Parameters:

object - object to export

Returns:

suitable export for the object or null

getFile

public java.lang.Object getFile(java.lang.String name)
                         throws java.io.IOException

This method creates a file in getDirectory(). The file name is based ob name: E.g., if name is test.png, the actual name could be something like test123.png. It is ensured that no file will be returned twice during a single export.

Parameters:

name - name for file

Returns:

file

Throws:

java.io.IOException

getFiles

public java.util.Collection getFiles()

Returns the list of files which have been created during export.

Returns:

created files

getFileSystem

public FileSystem getFileSystem()
                         throws java.io.IOException

This method returns the file system to use for the export. On first invocation, the file system is obtained from initFileSystem().

Returns:

file system to use for export

Throws:

java.io.IOException

getGraphState

public GraphState getGraphState()

Returns the graph state which is used for export. This is the graph state of the view's workbench.

Returns:

graph state for export

getOutputStream

public java.io.OutputStream getOutputStream(java.lang.Object file)
                                     throws java.io.IOException

Throws:

java.io.IOException

getPath

public java.lang.String getPath(FileObjectItem file)
                         throws java.io.IOException

Throws:

java.io.IOException

getPath

public java.lang.String getPath(java.lang.Object file)
                         throws java.io.IOException

Returns the path of a file of this export's file system (getFileSystem()) as a string.

Parameters:

file - file of this export's file system

Returns:

path of file

Throws:

java.io.IOException

getView

public View3D getView()
               throws java.io.IOException

Returns the view which defines the scene to export. This requires that the source of this export is an ObjectSource representing an instance of View3D.

Returns:

view

Throws:

java.io.IOException

initDirectory

protected java.lang.Object initDirectory()
                                  throws java.io.IOException

Determines the directory to use. This method is invoked once by getDirectory().

Returns:

directory to use

Throws:

java.io.IOException

initFileSystem

protected FileSystem initFileSystem()
                             throws java.io.IOException

Determines the file system to use. This method is invoked once by getFileSystem().

Returns:

file system to use

Throws:

java.io.IOException

visit

public void visit(SceneTree.Leaf leaf)

Description copied from interface: SceneTree.Visitor

Informs the visitor that a leaf is visited.

Specified by:

visit in interface SceneTree.Visitor

Parameters:

leaf - the leaf being visited

visitEnter

public void visitEnter(SceneTree.InnerNode node)

Description copied from interface: SceneTree.Visitor

Informs the visitor that an inner node has been entered.

Specified by:

visitEnter in interface SceneTree.Visitor

Parameters:

node - the node being entered

visitLeave

public void visitLeave(SceneTree.InnerNode node)

Description copied from interface: SceneTree.Visitor

Informs the visitor that an inner node has been left.

Specified by:

visitLeave in interface SceneTree.Visitor

Parameters:

node - the node being left

write

protected void write()
              throws java.io.IOException

Exports the scene of the view. This method at first creates the scene tree using createSceneTree(View3D), then it lets this export instance visit the created scene tree. During visit, the methods beginGroup(de.grogra.imp3d.objects.SceneTree.InnerNode), endGroup(de.grogra.imp3d.objects.SceneTree.InnerNode) and export(SceneTree.Leaf, SceneTree.InnerNode) are invoked; these have to be implemented to perform the actual export to the destination.

Throws:

java.io.IOException