at.newmedialab.ldpath.backend.linkeddata
Class AbstractLDBackend

java.lang.Object
  at.newmedialab.ldpath.backend.sesame.AbstractSesameBackend
      at.newmedialab.ldpath.backend.sesame.SesameRepositoryBackend
          at.newmedialab.ldpath.backend.linkeddata.AbstractLDBackend

All Implemented Interfaces:

LDCacheProvider, at.newmedialab.ldpath.api.backend.RDFBackend<org.openrdf.model.Value>

Direct Known Subclasses:

LDMemoryBackend, LDPersistentBackend

public abstract class AbstractLDBackend
extends SesameRepositoryBackend
implements LDCacheProvider

Abstract superclass for Linked Data backends. Implements functionality common to all implementations.

Author: Sebastian Schaffert

Constructor Summary

protected

AbstractLDBackend() Initialise a new sesame backend.

Method Summary

org.openrdf.repository.Repository	getTripleRepository() Return the sesame repository used for storing the triples that are retrieved from the Linked Data Cloud.
Collection<Endpoint>	listEndpoints() List all endpoints currently registered with the Linked Data cache provider.
Collection<org.openrdf.model.Value>	listObjects(org.openrdf.model.Value subject, org.openrdf.model.Value property) List the objects of triples in the triple store underlying this backend that have the subject and property given as argument.
Collection<org.openrdf.model.Value>	listSubjects(org.openrdf.model.Value property, org.openrdf.model.Value object) List the subjects of triples in the triple store underlying this backend that have the object and property given as argument.
void	registerEndpoint(Endpoint endpoint) Register a new Linked Data endpoint with this cache provider.
void	unregisterEndpoint(Endpoint endpoint) Unregister the Linked Data endpoint given as argument.

Methods inherited from class at.newmedialab.ldpath.backend.sesame.SesameRepositoryBackend

createLiteral, createLiteral, createURI, getRepository, setRepository

Methods inherited from class at.newmedialab.ldpath.backend.sesame.AbstractSesameBackend

booleanValue, createLiteralInternal, createLiteralInternal, createURIInternal, dateTimeValue, dateValue, debugType, decimalValue, doubleValue, floatValue, getLiteralLanguage, getLiteralType, getThreadPool, integerValue, intValue, isBlank, isLiteral, isURI, listObjectsInternal, listSubjectsInternal, longValue, stringValue, supportsThreading, timeValue

Methods inherited from class java.lang.Object

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

Methods inherited from interface at.newmedialab.ldclient.api.LDCacheProvider

getMetadataRepository

Constructor Detail

AbstractLDBackend

protected AbstractLDBackend()

Initialise a new sesame backend. Repository needs to be set using setRepository.

Method Detail

getTripleRepository

public org.openrdf.repository.Repository getTripleRepository()

Return the sesame repository used for storing the triples that are retrieved from the Linked Data Cloud. Triples will always be added to the context http://www.newmedialab.at/ldclient/cache to be able to distinguish them from other triples.

Specified by:

getTripleRepository in interface LDCacheProvider

Returns:

an initialised Sesame repository that can be used for caching triples

listObjects

public Collection<org.openrdf.model.Value> listObjects(org.openrdf.model.Value subject,
                                                       org.openrdf.model.Value property)

List the objects of triples in the triple store underlying this backend that have the subject and property given as argument.

Specified by:

listObjects in interface at.newmedialab.ldpath.api.backend.RDFBackend<org.openrdf.model.Value>

Overrides:

listObjects in class SesameRepositoryBackend

Parameters:

subject - the subject of the triples to look for

property - the property of the triples to look for

Returns:

all objects of triples with matching subject and property

listSubjects

public Collection<org.openrdf.model.Value> listSubjects(org.openrdf.model.Value property,
                                                        org.openrdf.model.Value object)

List the subjects of triples in the triple store underlying this backend that have the object and property given as argument.

Specified by:

listSubjects in interface at.newmedialab.ldpath.api.backend.RDFBackend<org.openrdf.model.Value>

Overrides:

listSubjects in class SesameRepositoryBackend

Parameters:

object - the object of the triples to look for

property - the property of the triples to look for

Returns:

all dubjects of triples with matching object and property

Throws:

UnsupportedOperationException - in case reverse selection is not supported (e.g. when querying Linked Data)

registerEndpoint

public void registerEndpoint(Endpoint endpoint)

Register a new Linked Data endpoint with this cache provider.

Specified by:

registerEndpoint in interface LDCacheProvider

Parameters:

endpoint -

listEndpoints

public Collection<Endpoint> listEndpoints()

List all endpoints currently registered with the Linked Data cache provider.

Specified by:

listEndpoints in interface LDCacheProvider

Returns:

a collection of endpoints

unregisterEndpoint

public void unregisterEndpoint(Endpoint endpoint)

Unregister the Linked Data endpoint given as argument.

Specified by:

unregisterEndpoint in interface LDCacheProvider

Parameters:

endpoint - the endpoint to unregister