Class GraphPattern
java.lang.Object
org.eclipse.rdf4j.query.parser.sparql.GraphPattern
A graph pattern consisting of (required and optional) tuple expressions, binding assignments and boolean constraints.
- Author:
- Arjohn Kampman
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Constructor Summary
ConstructorDescriptionCreates a new graph pattern.GraphPattern
(GraphPattern parent) Creates a new graph pattern that inherits the context and scope from a parent graph pattern. -
Method Summary
Modifier and TypeMethodDescriptionvoid
addConstraint
(ValueExpr constraint) void
addConstraints
(Collection<ValueExpr> constraints) void
addOptionalTE
(TupleExpr te, List<ValueExpr> constraints) add the supplied tuple expression as an optional expression, with a list of constraints that hold as conditions.void
addRequiredSP
(Var subjVar, Var predVar, Var objVar) void
buildOptionalTE
(TupleExpr result) Build optionals to the supplied TEBuilds a combined tuple expression from the tuple expressions and constraints in this graph pattern.void
clear()
Removes all tuple expressions and constraints.Retrieves the optional tuple expressions as a list of tuples with the tuple expression as the key and the list of value expressions as the value.void
setContextVar
(Var contextVar) void
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Constructor Details
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GraphPattern
public GraphPattern()Creates a new graph pattern. -
GraphPattern
Creates a new graph pattern that inherits the context and scope from a parent graph pattern.
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Method Details
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setContextVar
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getContextVar
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setStatementPatternScope
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getStatementPatternScope
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addRequiredTE
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addRequiredSP
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getRequiredTEs
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addOptionalTE
add the supplied tuple expression as an optional expression, with a list of constraints that hold as conditions.- Parameters:
te
- a tuple expressionconstraints
- a list of constraints that form a condition for the LeftJoin to be formed from the optional TE.
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getOptionalTEs
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addConstraint
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addConstraints
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getConstraints
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removeAllConstraints
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clear
public void clear()Removes all tuple expressions and constraints. -
buildTupleExpr
Builds a combined tuple expression from the tuple expressions and constraints in this graph pattern.- Returns:
- A tuple expression for this graph pattern.
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buildOptionalTE
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