org.openrdf.query.algebra.evaluation.impl

Class TupleFunctionEvaluationStrategy

java.lang.Object

org.openrdf.query.algebra.evaluation.impl.TupleFunctionEvaluationStrategy

All Implemented Interfaces:

EvaluationStrategy, FederatedServiceResolver, UUIDable

public class TupleFunctionEvaluationStrategy
extends Object
implements EvaluationStrategy, UUIDable

An EvaluationStrategy that adds support for TupleFunctions to an existing EvaluationStrategy.

Constructor Summary

Constructors

Constructor and Description
TupleFunctionEvaluationStrategy(EvaluationStrategy delegate, ValueFactory valueFactory)
TupleFunctionEvaluationStrategy(EvaluationStrategy delegate, ValueFactory valueFactory, TupleFunctionRegistry tupleFuncRegistry)

Method Summary

Modifier and Type	Method and Description
CloseableIteration<BindingSet,QueryEvaluationException>	evaluate(Service expr, String serviceUri, CloseableIteration<BindingSet,QueryEvaluationException> bindings) Evaluates the tuple expression against the supplied triple source with the specified set of variable bindings as input.
CloseableIteration<BindingSet,QueryEvaluationException>	evaluate(TupleExpr expr, BindingSet bindings) Evaluates the tuple expression against the supplied triple source with the specified set of variable bindings as input.
CloseableIteration<BindingSet,QueryEvaluationException>	evaluate(TupleFunctionCall expr, BindingSet bindings)
static CloseableIteration<BindingSet,QueryEvaluationException>	evaluate(TupleFunction func, List<Var> resultVars, BindingSet bindings, ValueFactory valueFactory, Value... argValues)
Value	evaluate(ValueExpr expr, BindingSet bindings) Gets the value of this expression.
FederatedService	getService(String serviceUrl) Retrieve the FederatedService registered for serviceUrl.
UUID	getUUID()
boolean	isTrue(ValueExpr expr, BindingSet bindings) Evaluates the boolean expression on the supplied TripleSource object.

Methods inherited from class java.lang.Object

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

Constructor Detail

TupleFunctionEvaluationStrategy

public TupleFunctionEvaluationStrategy(EvaluationStrategy delegate,
                                       ValueFactory valueFactory)

TupleFunctionEvaluationStrategy

public TupleFunctionEvaluationStrategy(EvaluationStrategy delegate,
                                       ValueFactory valueFactory,
                                       TupleFunctionRegistry tupleFuncRegistry)

Method Detail

getUUID

public UUID getUUID()

Specified by:

getUUID in interface UUIDable

getService

public FederatedService getService(String serviceUrl)
                            throws QueryEvaluationException

Description copied from interface: EvaluationStrategy

Retrieve the FederatedService registered for serviceUrl. If there is no service registered for serviceUrl, a new SPARQLFederatedService is created and registered.

Specified by:

getService in interface EvaluationStrategy

Specified by:

getService in interface FederatedServiceResolver

Parameters:

serviceUrl - URL of the service.

Returns:

the FederatedService registered for the serviceUrl.

Throws:

QueryEvaluationException

See Also:

FederatedServiceResolver.getService(java.lang.String)

evaluate

public CloseableIteration<BindingSet,QueryEvaluationException> evaluate(Service expr,
                                                                        String serviceUri,
                                                                        CloseableIteration<BindingSet,QueryEvaluationException> bindings)
                                                                 throws QueryEvaluationException

Description copied from interface: EvaluationStrategy

Evaluates the tuple expression against the supplied triple source with the specified set of variable bindings as input.

Specified by:

evaluate in interface EvaluationStrategy

Parameters:

expr - The Service Expression to evaluate

serviceUri - TODO

bindings - The variables bindings iterator to use for evaluating the expression, if applicable.

Returns:

A closeable iterator over all of variable binding sets that match the tuple expression.

Throws:

QueryEvaluationException

evaluate

public CloseableIteration<BindingSet,QueryEvaluationException> evaluate(TupleExpr expr,
                                                                        BindingSet bindings)
                                                                 throws QueryEvaluationException

Description copied from interface: EvaluationStrategy

Evaluates the tuple expression against the supplied triple source with the specified set of variable bindings as input.

Specified by:

evaluate in interface EvaluationStrategy

Parameters:

expr - The Tuple Expression to evaluate

bindings - The variables bindings to use for evaluating the expression, if applicable.

Returns:

A closeable iterator over the variable binding sets that match the tuple expression.

Throws:

QueryEvaluationException

evaluate

public CloseableIteration<BindingSet,QueryEvaluationException> evaluate(TupleFunctionCall expr,
                                                                        BindingSet bindings)
                                                                 throws QueryEvaluationException

Throws:

QueryEvaluationException

evaluate

public Value evaluate(ValueExpr expr,
                      BindingSet bindings)
               throws QueryEvaluationException

Description copied from interface: EvaluationStrategy

Gets the value of this expression.

Specified by:

evaluate in interface EvaluationStrategy

bindings - The variables bindings to use for evaluating the expression, if applicable.

Returns:

The Value that this expression evaluates to, or null if the expression could not be evaluated.

Throws:

QueryEvaluationException

isTrue

public boolean isTrue(ValueExpr expr,
                      BindingSet bindings)
               throws QueryEvaluationException

Description copied from interface: EvaluationStrategy

Evaluates the boolean expression on the supplied TripleSource object.

Specified by:

isTrue in interface EvaluationStrategy

bindings - The variables bindings to use for evaluating the expression, if applicable.

Returns:

The result of the evaluation.

Throws:

ValueExprEvaluationException - If the value expression could not be evaluated, for example when comparing two incompatible operands. When thrown, the result of the boolean expression is neither true nor false , but unknown.

QueryEvaluationException

evaluate

public static CloseableIteration<BindingSet,QueryEvaluationException> evaluate(TupleFunction func,
                                                                               List<Var> resultVars,
                                                                               BindingSet bindings,
                                                                               ValueFactory valueFactory,
                                                                               Value... argValues)
                                                                        throws QueryEvaluationException

Throws:

QueryEvaluationException