org.openrdf.sail.memory.model

Class MemValueFactory

java.lang.Object

org.openrdf.model.impl.ValueFactoryBase

org.openrdf.sail.memory.model.MemValueFactory

All Implemented Interfaces:

ValueFactory

public class MemValueFactory
extends ValueFactoryBase

A factory for MemValue objects that keeps track of created objects to prevent the creation of duplicate objects, minimizing memory usage as a result.

Author:

Arjohn Kampman, David Huynh

Constructor Summary

Constructors

Constructor and Description
MemValueFactory()

Method Summary

Methods

Modifier and Type	Method and Description
void	clear()
BNode	createBNode(String nodeID)
protected Literal	createFPLiteral(Number n, URI datatype)
protected Literal	createIntegerLiteral(Number n, URI datatype)
Literal	createLiteral(boolean value)
Literal	createLiteral(String value)
Literal	createLiteral(String value, String language)
Literal	createLiteral(String value, URI datatype)
Literal	createLiteral(XMLGregorianCalendar calendar)
Statement	createStatement(Resource subject, URI predicate, Value object)
Statement	createStatement(Resource subject, URI predicate, Value object, Resource context)
URI	createURI(String uri)
URI	createURI(String namespace, String localName)
MemBNode	getMemBNode(BNode bnode) See getMemValue() for description.
Set<MemBNode>	getMemBNodes() Gets all bnodes that are managed by this value factory.
MemLiteral	getMemLiteral(Literal literal) See getMemValue() for description.
Set<MemLiteral>	getMemLiterals() Gets all literals that are managed by this value factory.
MemResource	getMemResource(Resource resource) See getMemValue() for description.
MemURI	getMemURI(URI uri) See getMemValue() for description.
Set<MemURI>	getMemURIs() Gets all URIs that are managed by this value factory.
MemValue	getMemValue(Value value) Returns a previously created MemValue that is equal to the supplied value, or null if the supplied value is a new value or is equal to null.
MemBNode	getOrCreateMemBNode(BNode bnode) See getOrCreateMemValue(Value) for description.
MemLiteral	getOrCreateMemLiteral(Literal literal) See getOrCreateMemValue(Value) for description.
MemResource	getOrCreateMemResource(Resource resource) See getOrCreateMemValue(Value) for description.
MemURI	getOrCreateMemURI(URI uri) See getOrCreateMemValue(Value) for description.
MemValue	getOrCreateMemValue(Value value) Gets or creates a MemValue for the supplied Value.

Methods inherited from class org.openrdf.model.impl.ValueFactoryBase

createBNode, createLiteral, createLiteral, createLiteral, createLiteral, createLiteral, createLiteral, createLiteral, createNumericLiteral, initBNodeParams

Methods inherited from class java.lang.Object

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

Constructor Detail

MemValueFactory

public MemValueFactory()

Method Detail

clear

public void clear()

getMemValue

public MemValue getMemValue(Value value)

Returns a previously created MemValue that is equal to the supplied value, or null if the supplied value is a new value or is equal to null.

Parameters:

value - The MemValue equivalent of the supplied value, or null.

Returns:

A previously created MemValue that is equal to value, or null if no such value exists or if value is equal to null.

getMemResource

public MemResource getMemResource(Resource resource)

See getMemValue() for description.

getMemURI

public MemURI getMemURI(URI uri)

See getMemValue() for description.

getMemBNode

public MemBNode getMemBNode(BNode bnode)

See getMemValue() for description.

getMemLiteral

public MemLiteral getMemLiteral(Literal literal)

See getMemValue() for description.

getMemURIs

public Set<MemURI> getMemURIs()

Gets all URIs that are managed by this value factory.

Warning: This method is not synchronized. To iterate over the returned set in a thread-safe way, this method should only be called while synchronizing on this object.

Returns:

An unmodifiable Set of MemURI objects.

getMemBNodes

public Set<MemBNode> getMemBNodes()

Gets all bnodes that are managed by this value factory.

Warning: This method is not synchronized. To iterate over the returned set in a thread-safe way, this method should only be called while synchronizing on this object.

Returns:

An unmodifiable Set of MemBNode objects.

getMemLiterals

public Set<MemLiteral> getMemLiterals()

Gets all literals that are managed by this value factory.

Warning: This method is not synchronized. To iterate over the returned set in a thread-safe way, this method should only be called while synchronizing on this object.

Returns:

An unmodifiable Set of MemURI objects.

getOrCreateMemValue

public MemValue getOrCreateMemValue(Value value)

Gets or creates a MemValue for the supplied Value. If the factory already contains a MemValue object that is equivalent to the supplied value then this equivalent value will be returned. Otherwise a new MemValue will be created, stored for future calls and then returned.

Parameters:

value - A Resource or Literal.

Returns:

The existing or created MemValue.

getOrCreateMemResource

public MemResource getOrCreateMemResource(Resource resource)

See getOrCreateMemValue(Value) for description.

getOrCreateMemURI

public MemURI getOrCreateMemURI(URI uri)

See getOrCreateMemValue(Value) for description.

getOrCreateMemBNode

public MemBNode getOrCreateMemBNode(BNode bnode)

See getOrCreateMemValue(Value) for description.

getOrCreateMemLiteral

public MemLiteral getOrCreateMemLiteral(Literal literal)

See getOrCreateMemValue(Value) for description.

createURI

public URI createURI(String uri)

createURI

public URI createURI(String namespace,
            String localName)

createBNode

public BNode createBNode(String nodeID)

createLiteral

public Literal createLiteral(String value)

createLiteral

public Literal createLiteral(String value,
                    String language)

createLiteral

public Literal createLiteral(String value,
                    URI datatype)

createLiteral

public Literal createLiteral(boolean value)

Specified by:

createLiteral in interface ValueFactory

Overrides:

createLiteral in class ValueFactoryBase

createIntegerLiteral

protected Literal createIntegerLiteral(Number n,
                           URI datatype)

Overrides:

createIntegerLiteral in class ValueFactoryBase

createFPLiteral

protected Literal createFPLiteral(Number n,
                      URI datatype)

Overrides:

createFPLiteral in class ValueFactoryBase

createLiteral

public Literal createLiteral(XMLGregorianCalendar calendar)

Specified by:

createLiteral in interface ValueFactory

Overrides:

createLiteral in class ValueFactoryBase

createStatement

public Statement createStatement(Resource subject,
                        URI predicate,
                        Value object)

createStatement

public Statement createStatement(Resource subject,
                        URI predicate,
                        Value object,
                        Resource context)