Package org.aksw.jenax.dataaccess.sparql.factory.datasource

Class RDFDataSources

java.lang.Object

org.aksw.jenax.dataaccess.sparql.factory.datasource.RDFDataSources

public class RDFDataSources
extends Object

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static class	RDFDataSources.RDFDataSourceOverSparqlQueryConnection

Constructor Summary

Constructors

Constructor	Description
RDFDataSources()

Method Summary

Modifier and Type	Method	Description
static RDFDataSource	alwaysFail()	Create a datasource where any attempt to execute a query or an update will fail.
static <T> T	compute(RDFDataSource dataSource, Function<org.apache.jena.rdfconnection.RDFConnection,T> computation)	Utility method that bridges an RdfDataSource to a function that operates on a RDFConnection.
static RDFDataSource	decorate(RDFDataSource base, QueryExecTransform transform)
static RDFDataSource	decorate(RDFDataSource base, QueryTransform transform)
static RDFDataSource	decorate(RDFDataSource base, UpdateRequestTransform transform)
static RDFDataSource	decorate(RDFDataSource base, RdfDataSourceTransform transform)	Create a LinkSparqlQueryTransform that intercepts construct query requests and transforms them into select query ones.
static RDFDataSource	decorate(RDFDataSource base, LinkSparqlQueryTransform transform)
static RDFDataSource	decorate(RDFDataSource base, RDFLinkTransform transform)
static RDFDataSource	decorate(RDFDataSource base, RDFLinkSourceTransform transform)
static RDFDataSource	decorate(RDFDataSource base, org.aksw.jenax.stmt.core.SparqlStmtTransform transform)
static RDFDataSource	decorate(RDFDataSource base, org.apache.jena.sparql.algebra.optimize.Rewrite transform)
static RDFDataSource	decorate(RDFDataSource base, org.apache.jena.sparql.expr.ExprTransform transform)
static <T> T	exec(RDFDataSource dataSource, org.apache.jena.query.Query query, Function<? super org.apache.jena.query.QueryExecution,T> qeToResult)	Execute a query and invoke a function on the response.
static RDFDataSource	execQueryViaSelect(RDFDataSource base, Predicate<org.apache.jena.query.Query> query)
static String	fetchDatasetHash(RDFDataSource dataSource)
static RDFDataSource	of(org.apache.jena.graph.Graph graph)
static RDFDataSource	of(org.apache.jena.query.Dataset dataset)
static RDFDataSource	of(org.apache.jena.query.Dataset dataset, Supplier<org.apache.jena.rdfconnection.RDFConnection> connectionFactory)
static RDFDataSource	of(org.apache.jena.rdf.model.Model model)
static RDFDataSource	of(org.apache.jena.sparql.core.DatasetGraph dsg)
static RDFDataSource	ofQueryConnection(org.apache.jena.rdfconnection.SparqlQueryConnection conn)	Deprecated.
static RDFEngine	setupRdfDataSource(Map<String,Object> options)	Reads the 'engine' attribute from the options (if absent defaults to 'mem') and instantiates the appropriate data source - if possible
static RDFDataSource	wrapWithMacros(RDFDataSource base, Map<String,org.apache.jena.sparql.function.user.UserDefinedFunctionDefinition> udfRegistry)

Methods inherited from class java.lang.Object

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

Constructor Details

RDFDataSources

public RDFDataSources()

Method Details

alwaysFail

public static RDFDataSource alwaysFail()

Create a datasource where any attempt to execute a query or an update will fail.

of

public static RDFDataSource of(org.apache.jena.graph.Graph graph)

of

public static RDFDataSource of(org.apache.jena.sparql.core.DatasetGraph dsg)

of

public static RDFDataSource of(org.apache.jena.rdf.model.Model model)

of

public static RDFDataSource of(org.apache.jena.query.Dataset dataset)

of

public static RDFDataSource of(org.apache.jena.query.Dataset dataset,
 Supplier<org.apache.jena.rdfconnection.RDFConnection> connectionFactory)

exec

public static <T> T exec(RDFDataSource dataSource,
 org.apache.jena.query.Query query,
 Function<? super org.apache.jena.query.QueryExecution,T> qeToResult)

Execute a query and invoke a function on the response. Upon returning the internally freshly obtained connection and query execution are closed so the result must be detached from those resources.

setupRdfDataSource

public static RDFEngine setupRdfDataSource(Map<String,Object> options)
                                    throws Exception

Reads the 'engine' attribute from the options (if absent defaults to 'mem') and instantiates the appropriate data source - if possible

Throws:

Exception

compute

public static <T> T compute(RDFDataSource dataSource,
 Function<org.apache.jena.rdfconnection.RDFConnection,T> computation)

Utility method that bridges an RdfDataSource to a function that operates on a RDFConnection.

fetchDatasetHash

public static String fetchDatasetHash(RDFDataSource dataSource)

ofQueryConnection

@Deprecated
public static RDFDataSource ofQueryConnection(org.apache.jena.rdfconnection.SparqlQueryConnection conn)

Deprecated.

This method creates an RdfDataSource view over a connection. Wrapping a connection as an engine is more a hack and should be avoided.

decorate

public static RDFDataSource decorate(RDFDataSource base,
 RdfDataSourceTransform transform)

Create a LinkSparqlQueryTransform that intercepts construct query requests and transforms them into select query ones. The execution work is done in a QueryExecBaseSelect.

decorate

public static RDFDataSource decorate(RDFDataSource base,
 RDFLinkTransform transform)

decorate

public static RDFDataSource decorate(RDFDataSource base,
 QueryTransform transform)

decorate

public static RDFDataSource decorate(RDFDataSource base,
 QueryExecTransform transform)

decorate

public static RDFDataSource decorate(RDFDataSource base,
 UpdateRequestTransform transform)

decorate

public static RDFDataSource decorate(RDFDataSource base,
 RDFLinkSourceTransform transform)

decorate

public static RDFDataSource decorate(RDFDataSource base,
 LinkSparqlQueryTransform transform)

decorate

public static RDFDataSource decorate(RDFDataSource base,
 org.aksw.jenax.stmt.core.SparqlStmtTransform transform)

decorate

public static RDFDataSource decorate(RDFDataSource base,
 org.apache.jena.sparql.algebra.optimize.Rewrite transform)

decorate

public static RDFDataSource decorate(RDFDataSource base,
 org.apache.jena.sparql.expr.ExprTransform transform)

execQueryViaSelect

public static RDFDataSource execQueryViaSelect(RDFDataSource base,
 Predicate<org.apache.jena.query.Query> query)

wrapWithMacros

public static RDFDataSource wrapWithMacros(RDFDataSource base,
 Map<String,org.apache.jena.sparql.function.user.UserDefinedFunctionDefinition> udfRegistry)