org.jrdf.parser.mem
Class ParserBlankNodeFactoryImpl

java.lang.Object
  org.jrdf.parser.mem.ParserBlankNodeFactoryImpl

All Implemented Interfaces:

ParserBlankNodeFactory

public class ParserBlankNodeFactoryImpl

extends Object

implements ParserBlankNodeFactory

A factory for BlankNodes that uses a Map to keep track of the BlankNodes that have been allocated by createBlankNode(String) so that the same BlankNode object can be returned for a given nodeID.

Version:

$Revision: 1.1 $

Author:

David Makepeace

Constructor Summary

ParserBlankNodeFactoryImpl(GraphElementFactory newValueFactory)
Create a new blank node factory with the given value factory.

Method Summary

void	clear() Clears the internal Map.
BlankNode	createBlankNode() Always creates a new BlankNode object from the GraphElementFactory.
BlankNode	createBlankNode(String nodeID) Returns the BlankNode for a nodeID that has not been seen before or calls the GraphElementFactory to create a new BlankNode otherwise.

Methods inherited from class java.lang.Object

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

Constructor Detail

ParserBlankNodeFactoryImpl

public ParserBlankNodeFactoryImpl(GraphElementFactory newValueFactory)

Create a new blank node factory with the given value factory.

Parameters:

newValueFactory - factory to create nodes with.

Method Detail

createBlankNode

public BlankNode createBlankNode()
                          throws GraphElementFactoryException

Always creates a new BlankNode object from the GraphElementFactory.

Specified by:

createBlankNode in interface ParserBlankNodeFactory

Returns:

the new BlankNode object.

Throws:

GraphElementFactoryException - if it fails to create a new blank node.

createBlankNode

public BlankNode createBlankNode(String nodeID)
                          throws GraphElementFactoryException

Returns the BlankNode for a nodeID that has not been seen before or calls the GraphElementFactory to create a new BlankNode otherwise.

Specified by:

createBlankNode in interface ParserBlankNodeFactory

Parameters:

nodeID - the node that labels the bNode in the file being parsed.

Returns:

the BlankNode object.

Throws:

GraphElementFactoryException - if it fails to create a new blank node.

clear

public void clear()

Clears the internal Map.

Specified by:

clear in interface ParserBlankNodeFactory