Class GmlExporter<V,E>

java.lang.Object

org.jgrapht.nio.BaseExporter<V,E>

org.jgrapht.nio.gml.GmlExporter<V,E>

Type Parameters:

V - the graph vertex type

E - the graph edge type

All Implemented Interfaces:

GraphExporter<V,E>

public class GmlExporter<V,E>
extends BaseExporter<V,E>
implements GraphExporter<V,E>

Exports a graph into a GML file (Graph Modeling Language).

For a description of the format see https://github.com/GunterMueller/UNI_PASSAU_FMI_Graph_Drawing/blob/master/GML/gml-technical-report.pdf.

The behavior of the exporter such as whether to print vertex labels, edge labels, and/or edge weights can be adjusted using the setParameter method. When exporting labels, the exporter escapes them as Java strings.

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static enum	GmlExporter.Parameter	Parameters that affect the behavior of the GmlExporter exporter.

Field Summary

Fields

Modifier and Type	Field	Description
private static final String	CREATOR
private static final String	DELIM
private static final Set<String>	FORBIDDEN_EDGE_CUSTOM_ATTRIBUTE_KEYS
private static final Set<String>	FORBIDDEN_VERTEX_CUSTOM_ATTRIBUTE_KEYS
private static final String	LABEL_ATTRIBUTE_KEY
private final Set<GmlExporter.Parameter>	parameters
private static final String	TAB1
private static final String	TAB2
private static final String	VERSION
private static final String	WEIGHT_ATTRIBUTE_KEY

Fields inherited from class BaseExporter

edgeAttributeProvider, edgeIdProvider, graphAttributeProvider, graphIdProvider, vertexAttributeProvider, vertexIdProvider

Constructor Summary

Constructors

Constructor	Description
GmlExporter()	Creates a new GmlExporter object with integer id providers for the vertex identifiers.
GmlExporter(Function<V,String> vertexIdProvider)	Constructs a new GmlExporter object with the given id providers.

Method Summary

Modifier and Type	Method	Description
private void	exportAttribute(PrintWriter out, String key, Attribute attribute)
private void	exportEdges(PrintWriter out, Graph<V,E> g)
void	exportGraph(Graph<V,E> g, Writer writer)	Exports an graph into a plain text GML format.
private void	exportHeader(PrintWriter out)
private void	exportVertices(PrintWriter out, Graph<V,E> g)
boolean	isParameter(GmlExporter.Parameter p)	Return if a particular parameter of the exporter is enabled
private String	quoted(String s)
void	setParameter(GmlExporter.Parameter p, boolean value)	Set the value of a parameter of the exporter

Methods inherited from class BaseExporter

getEdgeAttribute, getEdgeAttributeProvider, getEdgeAttributes, getEdgeId, getEdgeIdProvider, getGraphAttribute, getGraphAttributeProvider, getGraphId, getGraphIdProvider, getVertexAttribute, getVertexAttributeProvider, getVertexAttributes, getVertexId, getVertexIdProvider, setEdgeAttributeProvider, setEdgeIdProvider, setGraphAttributeProvider, setGraphIdProvider, setVertexAttributeProvider, setVertexIdProvider

Methods inherited from class Object

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

Methods inherited from interface GraphExporter

exportGraph, exportGraph

Field Details

CREATOR

private static final String CREATOR

See Also:

• Constant Field Values

VERSION

private static final String VERSION

See Also:

• Constant Field Values

DELIM

private static final String DELIM

See Also:

• Constant Field Values

TAB1

private static final String TAB1

See Also:

• Constant Field Values

TAB2

private static final String TAB2

See Also:

• Constant Field Values

LABEL_ATTRIBUTE_KEY

private static final String LABEL_ATTRIBUTE_KEY

See Also:

• Constant Field Values

WEIGHT_ATTRIBUTE_KEY

private static final String WEIGHT_ATTRIBUTE_KEY

See Also:

• Constant Field Values

FORBIDDEN_VERTEX_CUSTOM_ATTRIBUTE_KEYS

private static final Set<String> FORBIDDEN_VERTEX_CUSTOM_ATTRIBUTE_KEYS

FORBIDDEN_EDGE_CUSTOM_ATTRIBUTE_KEYS

private static final Set<String> FORBIDDEN_EDGE_CUSTOM_ATTRIBUTE_KEYS

parameters

private final Set<GmlExporter.Parameter> parameters

Constructor Details

GmlExporter

public GmlExporter()

Creates a new GmlExporter object with integer id providers for the vertex identifiers.

GmlExporter

public GmlExporter(Function<V,String> vertexIdProvider)

Constructs a new GmlExporter object with the given id providers.

Parameters:

vertexIdProvider - for generating vertex IDs. Must not be null.

Method Details

exportGraph

public void exportGraph(Graph<V,E> g,
 Writer writer)

Exports an graph into a plain text GML format.

Specified by:

exportGraph in interface GraphExporter<V,E>

Parameters:

g - the graph

writer - the writer

isParameter

public boolean isParameter(GmlExporter.Parameter p)

Return if a particular parameter of the exporter is enabled

Parameters:

p - the parameter

Returns:

true if the parameter is set, false otherwise

setParameter

public void setParameter(GmlExporter.Parameter p,
 boolean value)

Set the value of a parameter of the exporter

Parameters:

p - the parameter

value - the value to set

quoted

private String quoted(String s)

exportHeader

private void exportHeader(PrintWriter out)

exportAttribute

private void exportAttribute(PrintWriter out,
 String key,
 Attribute attribute)

exportVertices

private void exportVertices(PrintWriter out,
 Graph<V,E> g)

exportEdges

private void exportEdges(PrintWriter out,
 Graph<V,E> g)