gov.nasa.worldwind.ogc.collada
Class ColladaRoot

java.lang.Object
  gov.nasa.worldwind.util.xml.AbstractXMLEventParser
      gov.nasa.worldwind.ogc.collada.ColladaAbstractObject
          gov.nasa.worldwind.ogc.collada.ColladaRoot

All Implemented Interfaces:

ColladaRenderable, Highlightable, XMLEventParser

public class ColladaRoot
extends ColladaAbstractObject
implements ColladaRenderable, Highlightable

Parses a COLLADA document and provides access to its contents. Instructions for parsing COLLADA files and streams are given in the Description section of gov.nasa.worldwind.ogc.collada.

Field Summary

protected int	altitudeMode This shape's altitude mode.
protected ColladaDoc	colladaDoc Reference to the ColladaDoc representing the COLLADA file.
protected XMLEventReader	eventReader The event reader used to parse the document's XML.
protected InputStream	eventStream The input stream underlying the event reader.
protected Angle	heading This shape's heading, positive values are clockwise from north.
protected boolean	highlighted Indicates whether or not the COLLADA model is highlighted.
protected Matrix	matrix Transform matrix computed from the document's scale and orientation.
protected Vec4	modelScale A scale to apply to the model.
protected ColladaParserContext	parserContext The parser context for the document.
protected Angle	pitch This shape's pitch (often called tilt), its rotation about the model's X axis.
protected Position	position This shape's geographic location.
protected ColladaResourceResolver	resourceResolver Resource resolver to resolve relative file paths.
protected Angle	roll This shape's roll, its rotation about the model's Y axis.
protected double	scale Scale applied to the model.
protected boolean	scaleFetched Flag to indicate that the scale has been computed.
protected ColladaScene	scene Cached COLLADA scene.
protected boolean	sceneFetched Flag to indicate that the scene has been retrieved from the hash map.

Fields inherited from class gov.nasa.worldwind.util.xml.AbstractXMLEventParser

CHARACTERS_CONTENT, fields, namespaceURI, parent

Constructor Summary

ColladaRoot(ColladaDoc docSource)
Create a new ColladaRoot for a ColladaDoc instance.

ColladaRoot(File docSource)
Create a new ColladaRoot for a File.

ColladaRoot(InputStream docSource)
Create a new ColladaRoot for a InputStream.

ColladaRoot(URL docSource)
Create a new ColladaRoot for a URL.

Method Summary

protected boolean	canParseContentType(String mimeType) Determines if a MIME type can be parsed as COLLADA.
protected void	closeEventStream() Closes the event stream associated with this context's XML event reader.
protected double	computeScale() Indicates the scale defined by the asset/unit element.
static ColladaRoot	create(Object docSource) Creates a Collada root for an untyped source.
static ColladaRoot	createAndParse(Object docSource) Creates and parses a Collada root for an untyped source.
protected ColladaParserContext	createParserContext(XMLEventReader reader) Invoked during initialize() to create the parser context.
protected XMLEventReader	createReader(Object docSource) Creates the event reader.
int	getAltitudeMode() Returns this shape's altitude mode.
ColladaAsset	getAsset() Indicates the asset field of this document.
protected ColladaDoc	getColladaDoc() Indicates the document that is the source of this root.
Angle	getHeading() Indicates this shape's heading, its rotation clockwise from north.
Object	getItemByID(String id) Finds a named element in the document.
Box	getLocalExtent(ColladaTraversalContext tc) Returns this renderable's model coordinate extent.
protected Matrix	getMatrix() Indicates the transform matrix applied to this document.
Vec4	getModelScale() Indicates this shape's scale, if any.
protected XMLEventParserContext	getParserContext() Indicates the parser context used by this document.
Angle	getPitch() Indicates this shape's pitch -- often referred to as tilt -- the angle to rotate this shape's model about its X axis.
Position	getPosition() Indicates this shape's geographic position.
ColladaResourceResolver	getResourceResolver() Indicates the resource resolver used to resolve relative file paths.
Angle	getRoll() Indicates this shape's roll, the angle to rotate this shape's model about its Y axis.
protected double	getScale() Indicates the scale factored applied to this document.
ColladaScene	getScene() Indicates the scene contained in this document.
String	getSupportFilePath(String link) Determines the path of a supporting file (such an image).
protected void	initialize() Called just before the constructor returns.
boolean	isHighlighted() Indicates whether to highlight the shape.
ColladaRoot	parse(Object... args) Starts document parsing.
protected ColladaRoot	parseCachedColladaFile(URL url, String linkBase) Open and parse the specified file expressed as a file: URL..
void	preRender(ColladaTraversalContext tc, DrawContext dc) Pre-Render this element.
void	render(ColladaTraversalContext tc, DrawContext dc) Render this element.
protected void	reset() Clear cached values.
protected Object	resolveLocalReference(String linkBase, String linkRef) Resolves a reference to a local element identified by address and identifier, where linkBase identifies a document, including the current document, and linkRef is the id of the desired element.
Object	resolveReference(String link) Resolves a reference to a local or remote file or element.
Object	resolveRemoteReference(String linkBase, String linkRef) Resolves a reference to a remote element identified by address and identifier, where linkBase identifies a remote document, and linkRef is the id of the desired element.
void	setAltitudeMode(int altitudeMode) Specifies this shape's altitude mode, one of WorldWind.ABSOLUTE, WorldWind.RELATIVE_TO_GROUND or WorldWind.CLAMP_TO_GROUND.
void	setHeading(Angle heading) Specifies this shape's heading, its rotation clockwise from north.
void	setHighlighted(boolean highlighted) Specifies whether to highlight the shape.
void	setModelScale(Vec4 modelScale) Specifies this shape's scale.
void	setPitch(Angle pitch) Specifies this shape's pitch -- often referred to as tilt -- the angle to rotate this shape's model about its X axis.
void	setPosition(Position position) Specifies this shape's geographic position.
void	setResourceResolver(ColladaResourceResolver resourceResolver) Specifies a resource resolver to resolve relative file paths.
void	setRoll(Angle roll) Specifies this shape's roll, the angle to rotate this shape's model about its Y axis.

Methods inherited from class gov.nasa.worldwind.ogc.collada.ColladaAbstractObject

getRoot

Methods inherited from class gov.nasa.worldwind.util.xml.AbstractXMLEventParser

allocate, doAddCharacters, doAddEventAttribute, doAddEventContent, doParseEventAttributes, doParseEventContent, freeResources, getAConstructor, getCharacters, getField, getField, getFields, getNamespaceURI, getParent, hasField, hasField, hasFields, mergeFields, newInstance, overrideFields, parse, parseCharacterContent, removeField, setField, setField, setFields, setParent

Methods inherited from class java.lang.Object

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

Field Detail

altitudeMode

protected int altitudeMode

This shape's altitude mode. May be one of WorldWind.CLAMP_TO_GROUND, WorldWind.RELATIVE_TO_GROUND, or WorldWind.ABSOLUTE.

colladaDoc

protected ColladaDoc colladaDoc

Reference to the ColladaDoc representing the COLLADA file.

eventReader

protected XMLEventReader eventReader

The event reader used to parse the document's XML.

eventStream

protected InputStream eventStream

The input stream underlying the event reader.

heading

protected Angle heading

This shape's heading, positive values are clockwise from north. Null is an allowed value.

highlighted

protected boolean highlighted

Indicates whether or not the COLLADA model is highlighted.

matrix

protected Matrix matrix

Transform matrix computed from the document's scale and orientation. This matrix is computed and cached during when the document is rendered.

modelScale

protected Vec4 modelScale

A scale to apply to the model. Null is an allowed value.

parserContext

protected ColladaParserContext parserContext

The parser context for the document.

pitch

protected Angle pitch

This shape's pitch (often called tilt), its rotation about the model's X axis. Positive values are clockwise. Null is an allowed value.

position

protected Position position

This shape's geographic location. The altitude is relative to this shapes altitude mode.

resourceResolver

protected ColladaResourceResolver resourceResolver

Resource resolver to resolve relative file paths.

roll

protected Angle roll

This shape's roll, its rotation about the model's Y axis. Positive values are clockwise. Null is an allowed Value.

scale

protected double scale

Scale applied to the model. Determined by the COLLADA/asset/unit element.

scaleFetched

protected boolean scaleFetched

Flag to indicate that the scale has been computed.

scene

protected ColladaScene scene

Cached COLLADA scene.

sceneFetched

protected boolean sceneFetched

Flag to indicate that the scene has been retrieved from the hash map.

Constructor Detail

ColladaRoot

public ColladaRoot(ColladaDoc docSource)
            throws IOException

Create a new ColladaRoot for a ColladaDoc instance. A ColladaDoc represents COLLADA files from either files or input streams.

Parameters:

docSource - the ColladaDoc instance representing the COLLADA document.

Throws:

IllegalArgumentException - if the document source is null.

IOException - if an error occurs while reading the COLLADA document.

ColladaRoot

public ColladaRoot(File docSource)
            throws IOException

Create a new ColladaRoot for a File.

Parameters:

docSource - the File containing the document.

Throws:

IllegalArgumentException - if the document source is null.

IOException - if an error occurs while reading the Collada document.

ColladaRoot

public ColladaRoot(InputStream docSource)
            throws IOException

Create a new ColladaRoot for a InputStream.

Parameters:

docSource - the URL of the document.

Throws:

IllegalArgumentException - if the document source is null.

IOException - if an error occurs while reading the Collada document.

ColladaRoot

public ColladaRoot(URL docSource)
            throws IOException

Create a new ColladaRoot for a URL.

Parameters:

docSource - the URL of the document.

Throws:

IllegalArgumentException - if the document source is null.

IOException - if an error occurs while reading the Collada document.

Method Detail

canParseContentType

protected boolean canParseContentType(String mimeType)

Determines if a MIME type can be parsed as COLLADA. Parsable types are the COLLADA MIME type, as well as "text/plain" and "text/xml".

Parameters:

mimeType - Type to test. May be null.

Returns:

true if mimeType can be parsed as COLLADA.

closeEventStream

protected void closeEventStream()

Closes the event stream associated with this context's XML event reader.

computeScale

protected double computeScale()

Indicates the scale defined by the asset/unit element. This scale converts the document's units to meters.

Returns:

Scale for this document, or 1.0 if no scale is defined.

create

public static ColladaRoot create(Object docSource)
                          throws IOException

Creates a Collada root for an untyped source. The source must be either a File or a String identifying either a file path or a URL. Null is returned if the source type is not recognized.

Parameters:

docSource - either a File or a String identifying a file path or URL.

Returns:

a new ColladaRoot for the specified source, or null if the source type is not supported.

Throws:

IllegalArgumentException - if the source is null.

IOException - if an error occurs while reading the source.

createAndParse

public static ColladaRoot createAndParse(Object docSource)
                                  throws IOException,
                                         XMLStreamException

Creates and parses a Collada root for an untyped source. The source must be either a File or a String identifying either a file path or a URL. Null is returned if the source type is not recognized.

Parameters:

docSource - either a File or a String identifying a file path or URL.

Returns:

a new ColladaRoot for the specified source, or null if the source type is not supported.

Throws:

IllegalArgumentException - if the source is null.

IOException - if an error occurs while reading the source.

XMLStreamException

createParserContext

protected ColladaParserContext createParserContext(XMLEventReader reader)

Invoked during initialize() to create the parser context. The parser context is created by the global XMLEventParserContextFactory.

Parameters:

reader - the reader to associate with the parser context.

Returns:

a new parser context.

createReader

protected XMLEventReader createReader(Object docSource)

Creates the event reader. Called from the constructor.

Parameters:

docSource - the document source to create a reader for. The type can be any of those supported by WWXML.openEventReader(Object).

Returns:

a new event reader, or null if the source type cannot be determined.

getAltitudeMode

public int getAltitudeMode()

Returns this shape's altitude mode.

Returns:

this shape's altitude mode.

See Also:

setAltitudeMode(int)

getAsset

public ColladaAsset getAsset()

Indicates the asset field of this document.

Returns:

The asset field, or null if the field has not been set.

getColladaDoc

protected ColladaDoc getColladaDoc()

Indicates the document that is the source of this root.

Returns:

The source of the COLLADA content.

getHeading

public Angle getHeading()

Indicates this shape's heading, its rotation clockwise from north.

Returns:

this shape's heading, or null if no heading has been specified.

getItemByID

public Object getItemByID(String id)

Finds a named element in the document.

Parameters:

id - the element's identifier. If null, null is returned.

Returns:

the element requested, or null if there is no corresponding element in the document.

getLocalExtent

public Box getLocalExtent(ColladaTraversalContext tc)

Description copied from class: ColladaAbstractObject

Returns this renderable's model coordinate extent.

Specified by:

getLocalExtent in interface ColladaRenderable

Overrides:

getLocalExtent in class ColladaAbstractObject

Parameters:

tc - The traversal context to use when determining the extent.

Returns:

The model coordinate extent.

getMatrix

protected Matrix getMatrix()

Indicates the transform matrix applied to this document.

Returns:

Transform matrix.

getModelScale

public Vec4 getModelScale()

Indicates this shape's scale, if any.

Returns:

this shape's scale, or null if no scale has been specified.

getParserContext

protected XMLEventParserContext getParserContext()

Indicates the parser context used by this document.

Returns:

The parser context used to parse the document.

getPitch

public Angle getPitch()

Indicates this shape's pitch -- often referred to as tilt -- the angle to rotate this shape's model about its X axis.

Returns:

this shape's pitch, or null if no pitch has been specified. Positive values are clockwise as observed looking along the model's X axis toward the model's origin.

getPosition

public Position getPosition()

Indicates this shape's geographic position.

Returns:

this shape's geographic position. The position's altitude is relative to this shape's altitude mode.

getResourceResolver

public ColladaResourceResolver getResourceResolver()

Indicates the resource resolver used to resolve relative file paths.

Returns:

The resource resolver, or null if none is set.

getRoll

public Angle getRoll()

Indicates this shape's roll, the angle to rotate this shape's model about its Y axis.

Returns:

this shape's roll, or null if no roll has been specified. Positive values are clockwise as observed looking along the model's Y axis toward the origin.

getScale

protected double getScale()

Indicates the scale factored applied to this document. The scale is specified by the asset/unit element.

Returns:

Scale applied to the document. Returns 1.0 if the document does not specify a scale.

getScene

public ColladaScene getScene()

Indicates the scene contained in this document.

Returns:

The COLLADA scene, or null if there is no scene.

getSupportFilePath

public String getSupportFilePath(String link)
                          throws IOException

Determines the path of a supporting file (such an image). If a resource resolver has been specified, the resource resolver will be invoked to determine the file path. Otherwise, the path will be resolved relative to the COLLADA document's file path or URL.

Parameters:

link - Relative path to resolve.

Returns:

Absolute path of the resource, or null if the resource cannot be resolved.

Throws:

IOException - If an error occurs while attempting to resolve the resource.

initialize

protected void initialize()
                   throws IOException

Called just before the constructor returns. If overriding this method be sure to invoke super.initialize().

Throws:

IOException - if an I/O error occurs attempting to open the document source.

isHighlighted

public boolean isHighlighted()

Indicates whether to highlight the shape.

Specified by:

isHighlighted in interface Highlightable

Returns:

true to highlight the shape, otherwise false.

parse

public ColladaRoot parse(Object... args)
                  throws XMLStreamException

Starts document parsing. This method initiates parsing of the COLLADA document and returns when the full document has been parsed.

Parameters:

args - optional arguments to pass to parsers of sub-elements.

Returns:

this if parsing is successful, otherwise null.

Throws:

XMLStreamException - if an exception occurs while attempting to read the event stream.

parseCachedColladaFile

protected ColladaRoot parseCachedColladaFile(URL url,
                                             String linkBase)
                                      throws IOException,
                                             XMLStreamException

Open and parse the specified file expressed as a file: URL..

Parameters:

url - the URL of the file to open, expressed as a URL with a scheme of "file".

linkBase - the original address of the document if the file is a retrieved and cached file.

Returns:

A ColladaRoot representing the file's COLLADA contents.

Throws:

IOException - if an I/O error occurs during opening and parsing.

XMLStreamException - if a server parsing error is encountered.

preRender

public void preRender(ColladaTraversalContext tc,
                      DrawContext dc)

Pre-Render this element. Renders the scene contained in this document.

Specified by:

preRender in interface ColladaRenderable

Parameters:

tc - the current COLLADA traversal context.

dc - the current draw context.

render

public void render(ColladaTraversalContext tc,
                   DrawContext dc)

Render this element. Renders the scene contained in this document.

Specified by:

render in interface ColladaRenderable

Parameters:

tc - the current COLLADA traversal context.

dc - the current draw context.

reset

protected void reset()

Clear cached values. Values will be recomputed the next time this document is rendered.

resolveLocalReference

protected Object resolveLocalReference(String linkBase,
                                       String linkRef)

Resolves a reference to a local element identified by address and identifier, where linkBase identifies a document, including the current document, and linkRef is the id of the desired element.

If linkBase refers to a local COLLADA file and linkRef is non-null, the return value is the element identified by linkRef. If linkRef is null, the return value is a parsed ColladaRoot for the COLLADA file identified by linkBase. Otherwise, linkBase is returned.

Parameters:

linkBase - the address of the document containing the requested element.

linkRef - the element's identifier.

Returns:

the requested element, or null if the element is not found.

Throws:

IllegalArgumentException - if the address is null.

resolveReference

public Object resolveReference(String link)

Resolves a reference to a local or remote file or element. If the link refers to an element in the current document, this method returns that element. If the link refers to a remote document, this method will initiate asynchronous retrieval of the document, and return a URL of the downloaded document in the file cache, if it is available locally. If the link identifies a COLLADA document, the document will be returned as a parsed ColladaRoot.

Parameters:

link - the address of the document or element to resolve. This may be a full URL, a URL fragment that identifies an element in the current document ("#myElement"), or a URL and a fragment identifier ("http://server.com/model.dae#myElement").

Returns:

the requested element, or null if the element is not found.

Throws:

IllegalArgumentException - if the address is null.

resolveRemoteReference

public Object resolveRemoteReference(String linkBase,
                                     String linkRef)

Resolves a reference to a remote element identified by address and identifier, where linkBase identifies a remote document, and linkRef is the id of the desired element. This method retrieves resources asynchronously using the FileStore.

The return value is null if the file is not yet available in the FileStore. If linkBase refers to a COLLADA file and linkRef is non-null, the return value is the element identified by linkRef. If linkBase refers to a COLLADA file and linkRef is null, the return value is a parsed ColladaRoot for the COLLADA file identified by linkBase. Otherwise the return value is a URL to the file in the file cache.

Parameters:

linkBase - the address of the document containing the requested element.

linkRef - the element's identifier.

Returns:

URL to the requested file, parsed ColladaRoot, or COLLADA element. Returns null if the document is not yet available in the FileStore.

Throws:

IllegalArgumentException - if the linkBase is null.

setAltitudeMode

public void setAltitudeMode(int altitudeMode)

Specifies this shape's altitude mode, one of WorldWind.ABSOLUTE, WorldWind.RELATIVE_TO_GROUND or WorldWind.CLAMP_TO_GROUND.

Note: If the altitude mode is unrecognized, WorldWind.ABSOLUTE is used.

Note: Subclasses may recognize additional altitude modes or may not recognize the ones described above.

Parameters:

altitudeMode - the altitude mode. The default value is WorldWind.ABSOLUTE.

setHeading

public void setHeading(Angle heading)

Specifies this shape's heading, its rotation clockwise from north.

Parameters:

heading - this shape's heading. May be null.

setHighlighted

public void setHighlighted(boolean highlighted)

Specifies whether to highlight the shape. Setting root COLLADA root highlighted causes all parts of the COLLADA model to highlight.

Specified by:

setHighlighted in interface Highlightable

Parameters:

highlighted - true to highlight the shape, otherwise false.

setModelScale

public void setModelScale(Vec4 modelScale)

Specifies this shape's scale. The scale is applied to the shape's model definition in the model's coordinate system prior to oriented and positioning the model.

Parameters:

modelScale - this shape's scale. May be null, in which case no scaling is applied.

setPitch

public void setPitch(Angle pitch)

Specifies this shape's pitch -- often referred to as tilt -- the angle to rotate this shape's model about its X axis.

Parameters:

pitch - this shape's pitch. Positive values are clockwise as observed looking along the model's X axis toward the model's origin. May be null.

setPosition

public void setPosition(Position position)

Specifies this shape's geographic position. The position's altitude is relative to this shape's altitude mode.

Parameters:

position - this shape's geographic position.

Throws:

IllegalArgumentException - if the position is null.

setResourceResolver

public void setResourceResolver(ColladaResourceResolver resourceResolver)

Specifies a resource resolver to resolve relative file paths.

Parameters:

resourceResolver - New resource resolver. May be null.

setRoll

public void setRoll(Angle roll)

Specifies this shape's roll, the angle to rotate this shape's model about its Y axis.

Parameters:

roll - this shape's roll. May be null. Positive values are clockwise as observed looking along the model's Y axis toward the origin.