de.fuberlin.wiwiss.ng4j.impl
Class NamedGraphSetBase

java.lang.Object
  de.fuberlin.wiwiss.ng4j.impl.NamedGraphSetIO
      de.fuberlin.wiwiss.ng4j.impl.NamedGraphSetBase

All Implemented Interfaces:

NamedGraphSet

Direct Known Subclasses:

ARQNamedGraphSet

public abstract class NamedGraphSetBase
extends NamedGraphSetIO
implements NamedGraphSet

Author:

Richard Cyganiak (richard@cyganiak.de)

Constructor Summary

NamedGraphSetBase()

Method Summary

void	addQuad(Quad quad) Adds a quad to the NamedGraphSet.
boolean	containsQuad(Quad pattern) Tells wether the NamedGraphSet contains a quad or quads matching a pattern.
int	countQuads() Counts the Quads in the NamedGraphSet.
Iterator	findQuads(Node graphName, Node subject, Node predicate, Node object) Finds Quads that match a pattern.
Iterator	findQuads(Quad pattern) Finds Quads that match a quad pattern.
void	removeQuad(Quad pattern) Deletes Quads from the NamedGraphSet.

Methods inherited from class de.fuberlin.wiwiss.ng4j.impl.NamedGraphSetIO

read, read, read, write, write

Methods inherited from class java.lang.Object

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

Methods inherited from interface de.fuberlin.wiwiss.ng4j.NamedGraphSet

addGraph, asJenaGraph, asJenaModel, clear, close, containsGraph, containsGraph, countGraphs, createGraph, createGraph, getGraph, getGraph, isEmpty, listGraphs, read, read, read, removeGraph, removeGraph, write, write

Constructor Detail

NamedGraphSetBase

public NamedGraphSetBase()

Method Detail

addQuad

public void addQuad(Quad quad)

Description copied from interface: NamedGraphSet

Adds a quad to the NamedGraphSet. The argument must not contain any wildcards. If the quad is already present, nothing happens. A new named graph will automatically be created if necessary.

Specified by:

addQuad in interface NamedGraphSet

Parameters:

quad - A quad to be added to the NamedGraphSet

containsQuad

public boolean containsQuad(Quad pattern)

Description copied from interface: NamedGraphSet

Tells wether the NamedGraphSet contains a quad or quads matching a pattern. Quad patterns are Quad instances with Node.ANY in one or more positions.

Specified by:

containsQuad in interface NamedGraphSet

Parameters:

pattern - A quad or quad pattern

Returns:

True if The NamedGraphSet contains matching quads, false otherwise

countQuads

public int countQuads()

Description copied from interface: NamedGraphSet

Counts the Quads in the NamedGraphSet. Identical Triples in different NamedGraphs are counted individually.

Specified by:

countQuads in interface NamedGraphSet

Returns:

The number of Quads in the set

findQuads

public Iterator findQuads(Node graphName,
                          Node subject,
                          Node predicate,
                          Node object)

Description copied from interface: NamedGraphSet

Finds Quads that match a pattern. All arguments may be Node.ANY to match everything in that position.

Specified by:

findQuads in interface NamedGraphSet

Parameters:

graphName - The graph to find triples from

subject - The subject to be matched

predicate - The predicate to be matched

object - The object to be matched

Returns:

An iterator over all Quads that match the pattern

findQuads

public Iterator findQuads(Quad pattern)

Description copied from interface: NamedGraphSet

Finds Quads that match a quad pattern. The argument may contain wildcards (Node.ANY).

Specified by:

findQuads in interface NamedGraphSet

Parameters:

pattern - A quad or quad pattern

Returns:

An iterator over all Quads that match the pattern

removeQuad

public void removeQuad(Quad pattern)

Description copied from interface: NamedGraphSet

Deletes Quads from the NamedGraphSet. The argument may contain wildcards (Node.ANY). All matching Quads will be deleted. If no Quads match, nothing happens. This operation will not delete any NamedGraphs from the set. Empty NamedGraphs will be retained.

Specified by:

removeQuad in interface NamedGraphSet

Parameters:

pattern - A quad or quad pattern to be deleted