Interface ISparqlQueryProcessor

Interface for SPARQL Query Processors.

Namespace: VDS.RDF.Query
Assembly: dotNetRdf.dll
Syntax
public interface ISparqlQueryProcessor
Remarks

A SPARQL Query Processor is a class that knows how to evaluate SPARQL queries against some data source to which the processor has access.

The point of this interface is to allow for end users to implement custom query processors or to extend and modify the behaviour of the default Leviathan engine as required.

Methods

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ProcessQuery(IRdfHandler, ISparqlResultsHandler, SparqlQuery)

Processes a SPARQL Query passing the results to the RDF or Results handler as appropriate.

Declaration
void ProcessQuery(IRdfHandler rdfHandler, ISparqlResultsHandler resultsHandler, SparqlQuery query)
Parameters
Type Name Description
IRdfHandler rdfHandler

RDF Handler.
ISparqlResultsHandler resultsHandler

Results Handler.
SparqlQuery query

SPARQL Query.
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ProcessQuery(IRdfHandler, ISparqlResultsHandler, SparqlQuery, QueryCallback, object)

Processes a SPARQL Query asynchronously passing the results to the relevant handler and invoking the callback when the query completes.

Declaration
[Obsolete("This method is obsolete and will be removed in a future version. Use the ProcessQueryAsync method instead.")]
void ProcessQuery(IRdfHandler rdfHandler, ISparqlResultsHandler resultsHandler, SparqlQuery query, QueryCallback callback, object state)
Parameters
Type Name Description
IRdfHandler rdfHandler

RDF Handler.
ISparqlResultsHandler resultsHandler

Results Handler.
SparqlQuery query

SPARQL Query.
QueryCallback callback

Callback.
object state

State to pass to the callback.
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ProcessQuery(SparqlQuery)

Processes a SPARQL Query returning a IGraph instance or a SparqlResultSet depending on the type of the query.

Declaration
object ProcessQuery(SparqlQuery query)
Parameters
Type Name Description
SparqlQuery query

SPARQL Query.
Returns
Type Description
object

Either an IGraph instance of a SparqlResultSet depending on the type of the query.
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ProcessQuery(SparqlQuery, GraphCallback, SparqlResultsCallback, object)

Processes a SPARQL Query asynchronously invoking the relevant callback when the query completes.

Declaration
[Obsolete("This method is obsolete and will be removed in a future version. Use the ProcessQueryAsync method instead.")]
void ProcessQuery(SparqlQuery query, GraphCallback rdfCallback, SparqlResultsCallback resultsCallback, object state)
Parameters
Type Name Description
SparqlQuery query

SPARQL QUery.
GraphCallback rdfCallback

Callback for queries that return a Graph.
SparqlResultsCallback resultsCallback

Callback for queries that return a Result Set.
object state

State to pass to the callback.
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ProcessQueryAsync(IRdfHandler, ISparqlResultsHandler, SparqlQuery)

Process a SPARQL query asynchronously, passing the results to teh relevant handler.

Declaration
Task ProcessQueryAsync(IRdfHandler rdfHandler, ISparqlResultsHandler resultsHandler, SparqlQuery query)
Parameters
Type Name Description
IRdfHandler rdfHandler

RDF handler invoked for queries that return RDF graphs.
ISparqlResultsHandler resultsHandler

Results handler invoked for queries that return SPARQL results sets.
SparqlQuery query

SPARQL query.
Returns
Type Description
Task
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ProcessQueryAsync(SparqlQuery)

Process a SPARQL query asynchronously returning either a SparqlResultSet or a IGraph depending on the type of the query.

Declaration
Task<object> ProcessQueryAsync(SparqlQuery query)
Parameters
Type Name Description
SparqlQuery query

SPARQL query.
Returns
Type Description
Task<object>

Either an <see cref="IGraph">IGraph</see> instance of a <see cref="SparqlResultSet">SparqlResultSet</see> depending on the type of the query.

Extension Methods