salvo.jesus.graph.xml

Class XGMMLContentHandler

java.lang.Object

org.xml.sax.helpers.DefaultHandler

salvo.jesus.graph.xml.XMLToGraphHandler

salvo.jesus.graph.xml.XGMMLContentHandler

All Implemented Interfaces:

ContentHandler, DTDHandler, EntityResolver, ErrorHandler

public class XGMMLContentHandler
extends XMLToGraphHandler

Custom XMLToGraphHandler for parsing an XGMML input source using SAX2.

Author:

Jesus M. Salvo Jr.

Field Summary

Fields

Modifier and Type	Field and Description
String	className

Constructor Summary

Constructors

Constructor and Description
XGMMLContentHandler()

Method Summary

Modifier and Type	Method and Description
void	endEdgeElement() Processes <edge> elements.
void	endNodeElement()
String	getEdgeElementName()
String	getVertexElementName()
void	instantiateEdge()
void	instantiateGraph()
void	instantiateVertex()
void	processEdgeAttElement(Attributes attribs) Classes extending this abstract class may need to override this method.
void	processGraphicsAttElement(Attributes attribs)
void	processNodeAttElement(Attributes attribs) Classes extending this abstract class may need to override this method.
void	startAttElement(Attributes attribs) Process <att> element.
void	startCenterElement(Attributes attribs)
void	startEdgeElement(Attributes attribs)
void	startGraphElement(Attributes attribs) Detects if the graph is directed or not.
void	startGraphicsElement(Attributes attribs)
void	startLineElement(Attributes attribs)
void	startNodeElement(Attributes attribs)
void	startPointElement(Attributes attribs)

Methods inherited from class salvo.jesus.graph.xml.XMLToGraphHandler

endElement, getGraph, getVisualGraph, mapIDToVertex, startDocument, startElement

Methods inherited from class org.xml.sax.helpers.DefaultHandler

characters, endDocument, endPrefixMapping, error, fatalError, ignorableWhitespace, notationDecl, processingInstruction, resolveEntity, setDocumentLocator, skippedEntity, startPrefixMapping, unparsedEntityDecl, warning

Methods inherited from class java.lang.Object

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

Field Detail

className

public String className

Constructor Detail

XGMMLContentHandler

public XGMMLContentHandler()

Method Detail

instantiateGraph

public void instantiateGraph()
                      throws Exception

Specified by:

instantiateGraph in class XMLToGraphHandler

Throws:

Exception

instantiateVertex

public void instantiateVertex()
                       throws Exception

Specified by:

instantiateVertex in class XMLToGraphHandler

Throws:

Exception

startGraphElement

public void startGraphElement(Attributes attribs)

Detects if the graph is directed or not. The Graph instance is not instantiated here as we need to check if there are <att> elements of <graph< that further defines the graph's type, such as if it is weighted or a dag.

startAttElement

public void startAttElement(Attributes attribs)

Process <att> element. Internal processing within this method only occur if the top item on the stack is a result of the <graph> element. Therefore, internal processing only occurs if the parent element is <graph>

startNodeElement

public void startNodeElement(Attributes attribs)

endNodeElement

public void endNodeElement()
                    throws Exception

Throws:

Exception

startEdgeElement

public void startEdgeElement(Attributes attribs)

endEdgeElement

public void endEdgeElement()
                    throws Exception

Processes <edge> elements.

Besides checking for the weight attribute to determine if it is a weighted edge, it also checks the type of graph that was created. Hence, if the graph is an instance of DirectedGraph, then the type of Edge created is either a DirectedWeightedEdgeImpl or a DirectedEdgeImpl.

Throws:

Exception

startGraphicsElement

public void startGraphicsElement(Attributes attribs)
                          throws Exception

Throws:

Exception

startCenterElement

public void startCenterElement(Attributes attribs)
                        throws Exception

Throws:

Exception

startLineElement

public void startLineElement(Attributes attribs)
                      throws Exception

Throws:

Exception

startPointElement

public void startPointElement(Attributes attribs)
                       throws Exception

Throws:

Exception

instantiateEdge

public void instantiateEdge()
                     throws Exception

Specified by:

instantiateEdge in class XMLToGraphHandler

Throws:

Exception

processNodeAttElement

public void processNodeAttElement(Attributes attribs)

Classes extending this abstract class may need to override this method. All this method do is read in the value of the value attribute of the element where the name attribute is className, and reading that value into an internal variable.

When overriding this method, ensure that you call this method via

super.processNodeElement( attribs );

so that the internal variable is set.

processEdgeAttElement

public void processEdgeAttElement(Attributes attribs)

Classes extending this abstract class may need to override this method. All this method do is read in the value of the value attribute of the element where the name attribute is className, and reading that value into an internal variable.

When overriding this method, ensure that you call this method via

super.processNodeElement( attribs );

so that the internal variable is set.

processGraphicsAttElement

public void processGraphicsAttElement(Attributes attribs)

getVertexElementName

public String getVertexElementName()

Specified by:

getVertexElementName in class XMLToGraphHandler

getEdgeElementName

public String getEdgeElementName()

Specified by:

getEdgeElementName in class XMLToGraphHandler