org.eclipse.rdf4j.federated.algebra

Interface ExclusiveTupleExprRenderer

All Superinterfaces:

Cloneable, ExclusiveTupleExpr, FedXTupleExpr, QueryModelNode, QueryRef, Serializable, TupleExpr, VariableExpr

All Known Implementing Classes:

ExclusiveArbitraryLengthPath

public interface ExclusiveTupleExprRenderer
extends ExclusiveTupleExpr

A specialization of ExclusiveTupleExpr which provides definitions how the expressions can be rendered to a sub-query.

This is required for the evaluation of sub queries.

Author:

Andreas Schwarte

Method Summary

Modifier and Type	Method and Description
TupleExpr	toQueryAlgebra(Set<String> varNames, BindingSet bindings) Returns a SPARQL algebra representation of this expression that can be inserted into a SELECT TupleExpr
String	toQueryString(Set<String> varNames, BindingSet bindings) Returns a SPARQL string representation of this expression that can be inserted into a SELECT query.

Methods inherited from interface org.eclipse.rdf4j.federated.algebra.ExclusiveTupleExpr

getOwner

Methods inherited from interface org.eclipse.rdf4j.federated.algebra.FedXTupleExpr

getFreeVarCount

Methods inherited from interface org.eclipse.rdf4j.query.algebra.TupleExpr

clone, getAssuredBindingNames, getBindingNames

Methods inherited from interface org.eclipse.rdf4j.query.algebra.QueryModelNode

equals, getParentNode, getSignature, replaceChildNode, replaceWith, setParentNode, toString, visit, visitChildren

Methods inherited from interface org.eclipse.rdf4j.federated.algebra.VariableExpr

getFreeVars

Methods inherited from interface org.eclipse.rdf4j.federated.algebra.QueryRef

getQueryInfo

Method Detail

toQueryString

String toQueryString(Set<String> varNames,
                     BindingSet bindings)

Returns a SPARQL string representation of this expression that can be inserted into a SELECT query.

Implementations are required to create a valid query string for this expression where the given bindings are inserted.

Parameters:

varNames - the set of resulting (unbound) variables from this expression

bindings - the optional input bindings

Returns:

the query string part

toQueryAlgebra

TupleExpr toQueryAlgebra(Set<String> varNames,
                         BindingSet bindings)

Returns a SPARQL algebra representation of this expression that can be inserted into a SELECT TupleExpr

Implementations are required to create a new equivalent expression or clone, where any provided input bindings are inserted. The free variable names after insertion need to be added to the provided set.

Parameters:

varNames - the set of resulting (unbound) variables from this expression

bindings - the input bindings that need to be inserted

Returns:

the algebra expression