weka.gui.graphvisualizer

Class DotParser

java.lang.Object

weka.gui.graphvisualizer.DotParser

All Implemented Interfaces:

GraphConstants

public class DotParser
extends java.lang.Object
implements GraphConstants

This class parses input in DOT format, and builds the datastructures that are passed to it. It is NOT 100% compatible with the DOT format. The GraphNode and GraphEdge classes do not have any provision for dealing with different colours or shapes of nodes, there can however, be a different label and ID for a node. It also does not do anything for labels for edges. However, this class won't crash or throw an exception if it encounters any of the above attributes of an edge or a node. This class however, won't be able to deal with things like subgraphs and grouping of nodes.

Field Summary

Fields

Modifier and Type	Field and Description
protected java.util.ArrayList<GraphEdge>	m_edges
protected java.lang.String	m_graphName This holds the name of the graph if there is any otherwise it is null
protected java.io.Reader	m_input This is the input containing DOT stream to be parsed
protected java.util.ArrayList<GraphNode>	m_nodes These holds the nodes and edges of the graph

Fields inherited from interface weka.gui.graphvisualizer.GraphConstants

DIRECTED, DOUBLE, NORMAL, PLURAL_DUMMY, REVERSED, SINGULAR_DUMMY

Constructor Summary

Constructors

Constructor and Description
DotParser(java.io.Reader input, java.util.ArrayList<GraphNode> nodes, java.util.ArrayList<GraphEdge> edges) Dot parser Constructor

Method Summary

Modifier and Type	Method and Description
protected void	edgeAttrib(java.io.StreamTokenizer tk, GraphEdge e)
protected void	edgeStmt(java.io.StreamTokenizer tk, int nindex)
protected void	graph(java.io.StreamTokenizer tk) Following methods parse the DOT input and mimic the DOT language's grammar in their structure
protected void	nodeID(java.io.StreamTokenizer tk)
protected void	nodeStmt(java.io.StreamTokenizer tk, int nindex)
java.lang.String	parse() This method parses the string or the InputStream that we passed in through the constructor and builds up the m_nodes and m_edges vectors
protected void	setSyntax(java.io.StreamTokenizer tk) This method sets the syntax of the StreamTokenizer. i.e. set the whitespace, comment and delimit chars.
protected void	stmt(java.io.StreamTokenizer tk)
protected void	stmtList(java.io.StreamTokenizer tk)
static void	writeDOT(java.lang.String filename, java.lang.String graphName, java.util.ArrayList<GraphNode> nodes, java.util.ArrayList<GraphEdge> edges) This method saves a graph in a file in DOT format.

Methods inherited from class java.lang.Object

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

Field Detail

m_nodes

protected java.util.ArrayList<GraphNode> m_nodes

These holds the nodes and edges of the graph

m_edges

protected java.util.ArrayList<GraphEdge> m_edges

m_input

protected java.io.Reader m_input

This is the input containing DOT stream to be parsed

m_graphName

protected java.lang.String m_graphName

This holds the name of the graph if there is any otherwise it is null

Constructor Detail

DotParser

public DotParser(java.io.Reader input,
                 java.util.ArrayList<GraphNode> nodes,
                 java.util.ArrayList<GraphEdge> edges)

Dot parser Constructor

Parameters:

input - - The input, if passing in a string then encapsulate that in String reader object

nodes - - Vector to put in GraphNode objects, corresponding to the nodes parsed in from the input

edges - - Vector to put in GraphEdge objects, corresponding to the edges parsed in from the input

Method Detail

parse

public java.lang.String parse()

This method parses the string or the InputStream that we passed in through the constructor and builds up the m_nodes and m_edges vectors

Returns:

- returns the name of the graph

setSyntax

protected void setSyntax(java.io.StreamTokenizer tk)

This method sets the syntax of the StreamTokenizer. i.e. set the whitespace, comment and delimit chars.

graph

protected void graph(java.io.StreamTokenizer tk)

Following methods parse the DOT input and mimic the DOT language's grammar in their structure

stmtList

protected void stmtList(java.io.StreamTokenizer tk)
                 throws java.lang.Exception

Throws:

java.lang.Exception

stmt

protected void stmt(java.io.StreamTokenizer tk)

nodeID

protected void nodeID(java.io.StreamTokenizer tk)
               throws java.lang.Exception

Throws:

java.lang.Exception

nodeStmt

protected void nodeStmt(java.io.StreamTokenizer tk,
                        int nindex)
                 throws java.lang.Exception

Throws:

java.lang.Exception

edgeStmt

protected void edgeStmt(java.io.StreamTokenizer tk,
                        int nindex)
                 throws java.lang.Exception

Throws:

java.lang.Exception

edgeAttrib

protected void edgeAttrib(java.io.StreamTokenizer tk,
                          GraphEdge e)
                   throws java.lang.Exception

Throws:

java.lang.Exception

writeDOT

public static void writeDOT(java.lang.String filename,
                            java.lang.String graphName,
                            java.util.ArrayList<GraphNode> nodes,
                            java.util.ArrayList<GraphEdge> edges)

This method saves a graph in a file in DOT format. However, if reloaded in GraphVisualizer we would need to layout the graph again.

Parameters:

filename - - The name of the file to write in. (will overwrite)

graphName - - The name of the graph

nodes - - Vector containing all the nodes

edges - - Vector containing all the edges