Package org.eclipse.rdf4j.query.algebra
Class StatementPattern
java.lang.Object
org.eclipse.rdf4j.query.algebra.AbstractQueryModelNode
org.eclipse.rdf4j.query.algebra.StatementPattern
- All Implemented Interfaces:
Serializable
,Cloneable
,QueryModelNode
,TupleExpr
,VariableScopeChange
- Direct Known Subclasses:
EmptyStatementPattern
,FedXStatementPattern
,TrueStatementPattern
A tuple expression that matches a statement pattern against an RDF graph. Statement patterns can be targeted at one
of three context scopes: all contexts, null context only, or named contexts only.
- See Also:
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Nested Class Summary
Modifier and TypeClassDescriptionstatic enum
Indicates the scope of the statement pattern. -
Constructor Summary
ConstructorDescriptionStatementPattern
(StatementPattern.Scope scope, Var subject, Var predicate, Var object) Creates a statement pattern that matches a subject-, predicate- and object variable against statements from the specified context scope.StatementPattern
(StatementPattern.Scope scope, Var subjVar, Var predVar, Var objVar, Var conVar) Creates a statement pattern that matches a subject-, predicate-, object- and context variable against statements from the specified context scope.StatementPattern
(Var subject, Var predicate, Var object) Creates a statement pattern that matches a subject-, predicate- and object variable against statements from all contexts.StatementPattern
(Var subject, Var predicate, Var object, Var context) Creates a statement pattern that matches a subject-, predicate-, object- and context variable against statements from all contexts. -
Method Summary
Modifier and TypeMethodDescriptionclone()
Returns a (deep) clone of this query model node.boolean
Returns true if this query model node and its children are recursively equal to o and its children.Gets the names of the bindings that are guaranteed to be present in the results produced by this tuple expression.Gets the names of the bindings that are, or can be, returned by this tuple expression when it is evaluated.Returns the context variable, if available.getOrder()
getScope()
Gets the context scope for the statement pattern.Default implementation ofQueryModelNode.getSignature()
that prints the name of the node's class.getSupportedOrders
(AvailableStatementOrder tripleSource) <L extends Collection<Var>>
LgetVars
(L varCollection) Adds the variables of this statement pattern to the supplied collection.int
hashCode()
void
replaceChildNode
(QueryModelNode current, QueryModelNode replacement) Replaces one of the child nodes with a new node.void
setIndexName
(String indexName) void
protected boolean
<X extends Exception>
voidvisit
(QueryModelVisitor<X> visitor) Visits this node.<X extends Exception>
voidvisitChildren
(QueryModelVisitor<X> visitor) Visits the children of this node.Methods inherited from class org.eclipse.rdf4j.query.algebra.AbstractQueryModelNode
getCardinality, getCostEstimate, getParentNode, getResultSizeActual, getResultSizeEstimate, getTotalTimeNanosActual, isCardinalitySet, isVariableScopeChange, nullEquals, replaceNodeInList, replaceWith, resetCardinality, setCardinality, setCostEstimate, setParentNode, setResultSizeActual, setResultSizeEstimate, setTotalTimeNanosActual, setVariableScopeChange, toString
Methods inherited from class java.lang.Object
finalize, getClass, notify, notifyAll, wait, wait, wait
Methods inherited from interface org.eclipse.rdf4j.query.algebra.QueryModelNode
getCostEstimate, getParentNode, getResultSizeActual, getResultSizeEstimate, getTotalTimeNanosActual, replaceWith, setCostEstimate, setParentNode, setResultSizeActual, setResultSizeEstimate, setTotalTimeNanosActual, toString
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Constructor Details
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StatementPattern
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StatementPattern
Creates a statement pattern that matches a subject-, predicate- and object variable against statements from the specified context scope. -
StatementPattern
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StatementPattern
public StatementPattern(StatementPattern.Scope scope, Var subjVar, Var predVar, Var objVar, Var conVar) Creates a statement pattern that matches a subject-, predicate-, object- and context variable against statements from the specified context scope.
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Method Details
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getScope
Gets the context scope for the statement pattern. -
getSubjectVar
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getPredicateVar
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getObjectVar
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getContextVar
Returns the context variable, if available. -
getBindingNames
Description copied from interface:TupleExpr
Gets the names of the bindings that are, or can be, returned by this tuple expression when it is evaluated.- Specified by:
getBindingNames
in interfaceTupleExpr
- Returns:
- A set of binding names.
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getAssuredBindingNames
Description copied from interface:TupleExpr
Gets the names of the bindings that are guaranteed to be present in the results produced by this tuple expression.- Specified by:
getAssuredBindingNames
in interfaceTupleExpr
- Returns:
- A set of binding names.
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getVarList
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getVars
Adds the variables of this statement pattern to the supplied collection. -
visit
Description copied from interface:QueryModelNode
Visits this node. The node reports itself to the visitor with the proper runtime type.- Specified by:
visit
in interfaceQueryModelNode
- Throws:
X
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visitChildren
Description copied from interface:QueryModelNode
Visits the children of this node. The node callsQueryModelNode.visit(QueryModelVisitor)
on all of its child nodes.- Specified by:
visitChildren
in interfaceQueryModelNode
- Throws:
X
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replaceChildNode
Description copied from interface:QueryModelNode
Replaces one of the child nodes with a new node.- Specified by:
replaceChildNode
in interfaceQueryModelNode
- Parameters:
current
- The current child node.replacement
- The new child node.
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getSignature
Description copied from class:AbstractQueryModelNode
Default implementation ofQueryModelNode.getSignature()
that prints the name of the node's class.- Specified by:
getSignature
in interfaceQueryModelNode
- Overrides:
getSignature
in classAbstractQueryModelNode
- Returns:
- The node's signature, e.g. SLICE (offset=10, limit=10).
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equals
Description copied from interface:QueryModelNode
Returns true if this query model node and its children are recursively equal to o and its children.- Specified by:
equals
in interfaceQueryModelNode
- Overrides:
equals
in classObject
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hashCode
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clone
Description copied from interface:QueryModelNode
Returns a (deep) clone of this query model node. This method recursively clones the entire node tree, starting from this nodes.- Specified by:
clone
in interfaceQueryModelNode
- Specified by:
clone
in interfaceTupleExpr
- Overrides:
clone
in classAbstractQueryModelNode
- Returns:
- A deep clone of this query model node.
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getSupportedOrders
- Specified by:
getSupportedOrders
in interfaceTupleExpr
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setOrder
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shouldCacheCardinality
protected boolean shouldCacheCardinality()- Overrides:
shouldCacheCardinality
in classAbstractQueryModelNode
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getStatementOrder
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getOrder
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getIndexName
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setIndexName
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