Package org.eclipse.rdf4j.federated.evaluation

Interface TripleSource

All Known Implementing Classes:

SailTripleSource, SparqlTripleSource, TripleSourceBase

public interface TripleSource

Interface for implementations of triple sources. Particular implementations define how to evaluate the expression on the endpoint. Different implementations might be necessary depending on the underlying repository.

Author:

Andreas Schwarte

See Also:

• SparqlTripleSource
• SailTripleSource

Method Summary

Modifier and Type	Method	Description
CloseableIteration<BindingSet>	getStatements(String preparedQuery, BindingSet bindings, FilterValueExpr filterExpr, QueryInfo queryInfo)	Evaluate the prepared query (SPARQL query as String) on the provided endpoint.
CloseableIteration<BindingSet>	getStatements(String preparedQuery, BindingSet queryBindings, QueryType queryType, QueryInfo queryInfo)	Evaluate a given SPARQL query of the provided query type at the given source.
CloseableIteration<Statement>	getStatements(Resource subj, IRI pred, Value obj, QueryInfo queryInfo, Resource... contexts)	Return the statements matching the given pattern as a Statement iteration.
CloseableIteration<BindingSet>	getStatements(StatementPattern stmt, BindingSet bindings, FilterValueExpr filterExpr, QueryInfo queryInfo)	Evaluate the query expression on the provided endpoint.
CloseableIteration<BindingSet>	getStatements(TupleExpr preparedQuery, BindingSet bindings, FilterValueExpr filterExpr, QueryInfo queryInfo)	Evaluate the prepared query in its internal representation on the provided endpoint.
boolean	hasStatements(ExclusiveTupleExpr expr, BindingSet bindings)	Check if the repository can return results for the given ExclusiveTupleExpr, e.g.
boolean	hasStatements(Resource subj, IRI pred, Value obj, QueryInfo queryInfo, Resource... contexts)	Check if the repository can return results for the given triple pattern represented by subj, pred and obj
boolean	hasStatements(StatementPattern stmt, BindingSet bindings, QueryInfo queryInfo, Dataset dataset)	Check if the provided statement can return results.
boolean	usePreparedQuery(StatementPattern stmt, QueryInfo queryInfo)

Method Details

getStatements

CloseableIteration<BindingSet> getStatements(TupleExpr preparedQuery,
 BindingSet bindings,
 FilterValueExpr filterExpr,
 QueryInfo queryInfo)
                                      throws RepositoryException,
MalformedQueryException,
QueryEvaluationException

Evaluate the prepared query in its internal representation on the provided endpoint.

Parameters:

preparedQuery - a prepared query to evaluate

bindings - the bindings to use

filterExpr - the filter expression to apply or null if there is no filter or if it is evaluated already

Returns:

the resulting iteration

Throws:

RepositoryException

MalformedQueryException

QueryEvaluationException

getStatements

CloseableIteration<BindingSet> getStatements(String preparedQuery,
 BindingSet bindings,
 FilterValueExpr filterExpr,
 QueryInfo queryInfo)
                                      throws RepositoryException,
MalformedQueryException,
QueryEvaluationException

Evaluate the prepared query (SPARQL query as String) on the provided endpoint.

Parameters:

preparedQuery - a prepared query to evaluate (SPARQL query as String)

bindings - the bindings to use

filterExpr - the filter expression to apply or null if there is no filter or if it is evaluated already

Returns:

the resulting iteration

Throws:

RepositoryException

MalformedQueryException

QueryEvaluationException

getStatements

CloseableIteration<BindingSet> getStatements(String preparedQuery,
 BindingSet queryBindings,
 QueryType queryType,
 QueryInfo queryInfo)
                                      throws RepositoryException,
MalformedQueryException,
QueryEvaluationException

Evaluate a given SPARQL query of the provided query type at the given source.

Parameters:

preparedQuery -

queryBindings - optional query bindings, use EmptyBindingSet if there are none

queryType -

queryInfo -

Returns:

the statements

Throws:

RepositoryException

MalformedQueryException

QueryEvaluationException

getStatements

CloseableIteration<BindingSet> getStatements(StatementPattern stmt,
 BindingSet bindings,
 FilterValueExpr filterExpr,
 QueryInfo queryInfo)
                                      throws RepositoryException,
MalformedQueryException,
QueryEvaluationException

Evaluate the query expression on the provided endpoint.

Parameters:

stmt - the stmt expression to evaluate

bindings - the bindings to use

filterExpr - the filter expression to apply or null if there is no filter or if it is evaluated already

Returns:

the resulting iteration

Throws:

RepositoryException

MalformedQueryException

QueryEvaluationException

getStatements

CloseableIteration<Statement> getStatements(Resource subj,
 IRI pred,
 Value obj,
 QueryInfo queryInfo,
 Resource... contexts)
                                     throws RepositoryException,
MalformedQueryException,
QueryEvaluationException

Return the statements matching the given pattern as a Statement iteration.

Parameters:

subj -

pred -

obj -

contexts -

Returns:

the resulting iteration

Throws:

RepositoryException

MalformedQueryException

QueryEvaluationException

hasStatements

boolean hasStatements(StatementPattern stmt,
 BindingSet bindings,
 QueryInfo queryInfo,
 Dataset dataset)
               throws RepositoryException,
MalformedQueryException,
QueryEvaluationException

Check if the provided statement can return results.

Parameters:

stmt -

bindings - a binding set. in case no bindings are present, an EmptyBindingSet can be used (i.e. never null)

queryInfo -

dataset -

Returns:

whether the source can return results

Throws:

RepositoryException

MalformedQueryException

QueryEvaluationException

hasStatements

boolean hasStatements(Resource subj,
 IRI pred,
 Value obj,
 QueryInfo queryInfo,
 Resource... contexts)
               throws RepositoryException

Check if the repository can return results for the given triple pattern represented by subj, pred and obj

Parameters:

subj -

pred -

obj -

queryInfo -

contexts -

Returns:

whether the source can provide results

Throws:

RepositoryException

hasStatements

boolean hasStatements(ExclusiveTupleExpr expr,
 BindingSet bindings)
               throws RepositoryException,
MalformedQueryException,
QueryEvaluationException

Check if the repository can return results for the given ExclusiveTupleExpr, e.g. for an ExclusiveGroup with a list of Statements.

Parameters:

bindings -

group -

Returns:

whether the repository can return results

Throws:

RepositoryException

MalformedQueryException

QueryEvaluationException

usePreparedQuery

boolean usePreparedQuery(StatementPattern stmt,
 QueryInfo queryInfo)

Parameters:

stmt -

queryInfo -

Returns:

true if a prepared query is to be used preferably, false otherwise