de.fuberlin.wiwiss.marbles.dataproviders
Class SPARQLProviderBase

java.lang.Object
  de.fuberlin.wiwiss.marbles.dataproviders.SPARQLProviderBase

All Implemented Interfaces:

DataProvider

Direct Known Subclasses:

RevyuProvider

public abstract class SPARQLProviderBase
extends java.lang.Object
implements DataProvider

Abstract class to connect SPARQL data providers

Author:

Christian Becker

Constructor Summary

SPARQLProviderBase()

Method Summary

protected abstract java.lang.String	getEndpoint()
protected abstract java.lang.String	getQuery(org.openrdf.model.Resource resource) Generates a SPARQL query to retrieve appropriate data from the data source for the requested resource
org.apache.commons.httpclient.URI	getQueryURL(org.openrdf.model.Resource resource) Retrieves the URL to query the remote data provider about a given resource
java.util.List<org.apache.commons.httpclient.URI>	getURLsFromData(CacheController cacheController, org.openrdf.repository.RepositoryConnection conn, org.openrdf.model.Resource resource) Not implemented

Methods inherited from class java.lang.Object

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

Constructor Detail

SPARQLProviderBase

public SPARQLProviderBase()

Method Detail

getEndpoint

protected abstract java.lang.String getEndpoint()

Returns:

The service's SPARQL endpoint URL

getQuery

protected abstract java.lang.String getQuery(org.openrdf.model.Resource resource)

Generates a SPARQL query to retrieve appropriate data from the data source for the requested resource

Parameters:

resource - The resource for which information is requested

Returns:

SPARQL query text

getQueryURL

public org.apache.commons.httpclient.URI getQueryURL(org.openrdf.model.Resource resource)

Description copied from interface: DataProvider

Retrieves the URL to query the remote data provider about a given resource

Specified by:

getQueryURL in interface DataProvider

Parameters:

resource - The resource for which information is requested

Returns:

The URL to query

getURLsFromData

public java.util.List<org.apache.commons.httpclient.URI> getURLsFromData(CacheController cacheController,
                                                                         org.openrdf.repository.RepositoryConnection conn,
                                                                         org.openrdf.model.Resource resource)

Not implemented

Specified by:

getURLsFromData in interface DataProvider

Parameters:

cacheController - The CacheController used to resolve redirects

conn - A connection to a repository with the returned RDF result

resource - The resource for which information is requested

Returns:

A list of URLs or null if this functionality is not implemented