Package org.jgrapht.nio.csv

Class CSVImporter<V,E>

java.lang.Object

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

org.jgrapht.nio.csv.CSVImporter<V,E>

Type Parameters:

V - the graph vertex type

E - the graph edge type

All Implemented Interfaces:

GraphImporter<V,E>

public class CSVImporter<V,E>
extends BaseEventDrivenImporter<V,E>
implements GraphImporter<V,E>

Imports a graph from a CSV Format or any other Delimiter-separated value format.

The importer supports various different formats which can be adjusted using the setFormat method. The supported formats are the same CSV formats used by Gephi . For some of the formats, the behavior of the importer can be adjusted using the setParameter method. See CSVFormat for a description of the formats.

The importer respects rfc4180. The caller can also adjust the separator to something like semicolon or pipe instead of comma. In such a case, all fields are unescaped using the new separator. See Delimiter- separated values for more information.

This importer does not distinguish between CSVFormat.EDGE_LIST and CSVFormat.ADJACENCY_LIST. In both cases it assumes the format is CSVFormat.ADJACENCY_LIST.

Author:

Dimitrios Michail

See Also:

CSVFormat

Constructor Summary

Constructors

Constructor	Description
CSVImporter()	Constructs a new importer using the CSVFormat.ADJACENCY_LIST format as default.
CSVImporter(CSVFormat format)	Constructs a new importer.
CSVImporter(CSVFormat format, char delimiter)	Constructs a new importer.

Method Summary

Modifier and Type	Method	Description
char	getDelimiter()	Get the delimiter (comma, semicolon, pipe, etc).
CSVFormat	getFormat()	Get the format that the importer is using.
void	importGraph(Graph<V,E> graph, Reader input)	Import a graph.
boolean	isParameter(CSVFormat.Parameter p)	Return if a particular parameter of the exporter is enabled
void	setDelimiter(char delimiter)	Set the delimiter (comma, semicolon, pipe, etc).
void	setFormat(CSVFormat format)	Set the format of the importer
void	setParameter(CSVFormat.Parameter p, boolean value)	Set the value of a parameter of the exporter

Methods inherited from class org.jgrapht.nio.BaseEventDrivenImporter

addEdgeAttributeConsumer, addEdgeConsumer, addEdgeCountConsumer, addGraphAttributeConsumer, addImportEventConsumer, addVertexAttributeConsumer, addVertexConsumer, addVertexCountConsumer, notifyEdge, notifyEdgeAttribute, notifyEdgeCount, notifyGraphAttribute, notifyImportEvent, notifyVertex, notifyVertexAttribute, notifyVertexCount, removeEdgeAttributeConsumer, removeEdgeConsumer, removeEdgeCountConsumer, removeGraphAttributeConsumer, removeImportEventConsumer, removeVertexAttributeConsumer, removeVertexConsumer, removeVertexCountConsumer

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.jgrapht.nio.GraphImporter

importGraph, importGraph

Constructor Detail

CSVImporter

public CSVImporter()

Constructs a new importer using the CSVFormat.ADJACENCY_LIST format as default.

CSVImporter

public CSVImporter(CSVFormat format)

Constructs a new importer.

Parameters:

format - format to use out of the supported ones

CSVImporter

public CSVImporter(CSVFormat format,
                   char delimiter)

Constructs a new importer.

Parameters:

format - format to use out of the supported ones

delimiter - delimiter to use (comma, semicolon, pipe, etc.)

Method Detail

getFormat

public CSVFormat getFormat()

Get the format that the importer is using.

Returns:

the input format

setFormat

public void setFormat(CSVFormat format)

Set the format of the importer

Parameters:

format - the format to use

getDelimiter

public char getDelimiter()

Get the delimiter (comma, semicolon, pipe, etc).

Returns:

the delimiter

setDelimiter

public void setDelimiter(char delimiter)

Set the delimiter (comma, semicolon, pipe, etc).

Parameters:

delimiter - the delimiter to use

isParameter

public boolean isParameter(CSVFormat.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(CSVFormat.Parameter p,
                         boolean value)

Set the value of a parameter of the exporter

Parameters:

p - the parameter

value - the value to set

importGraph

public void importGraph(Graph<V,E> graph,
                        Reader input)
                 throws ImportException

Import a graph.

The provided graph must be able to support the features of the graph that is read. For example if the input contains self-loops then the graph provided must also support self-loops. The same for multiple edges.

If the provided graph is a weighted graph, the importer also reads edge weights.

Specified by:

importGraph in interface GraphImporter<V,E>

Parameters:

graph - the graph

input - the input reader

Throws:

ImportException - in case an error occurs, such as I/O or parse error