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
Nested ClassesModifier and TypeClassDescriptionstatic enumIndicates the scope of the statement pattern. -
Constructor Summary
ConstructorsConstructorDescriptionStatementPattern(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.booleanReturns 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.inthashCode()voidreplaceChildNode(QueryModelNode current, QueryModelNode replacement) Replaces one of the child nodes with a new node.voidsetIndexName(String indexName) voidprotected 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, toStringMethods inherited from class java.lang.Object
finalize, getClass, notify, notifyAll, wait, wait, waitMethods 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
Creates a statement pattern that matches a subject-, predicate- and object variable against statements from all contexts. -
StatementPattern
Creates a statement pattern that matches a subject-, predicate- and object variable against statements from the specified context scope. -
StatementPattern
Creates a statement pattern that matches a subject-, predicate-, object- and context variable against statements from all contexts. -
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:TupleExprGets the names of the bindings that are, or can be, returned by this tuple expression when it is evaluated.- Specified by:
getBindingNamesin interfaceTupleExpr- Returns:
- A set of binding names.
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getAssuredBindingNames
Description copied from interface:TupleExprGets the names of the bindings that are guaranteed to be present in the results produced by this tuple expression.- Specified by:
getAssuredBindingNamesin 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:QueryModelNodeVisits this node. The node reports itself to the visitor with the proper runtime type.- Specified by:
visitin interfaceQueryModelNode- Throws:
X extends Exception
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visitChildren
Description copied from interface:QueryModelNodeVisits the children of this node. The node callsQueryModelNode.visit(QueryModelVisitor)on all of its child nodes.- Specified by:
visitChildrenin interfaceQueryModelNode- Throws:
X extends Exception
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replaceChildNode
Description copied from interface:QueryModelNodeReplaces one of the child nodes with a new node.- Specified by:
replaceChildNodein interfaceQueryModelNode- Parameters:
current- The current child node.replacement- The new child node.
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getSignature
Description copied from class:AbstractQueryModelNodeDefault implementation ofQueryModelNode.getSignature()that prints the name of the node's class.- Specified by:
getSignaturein interfaceQueryModelNode- Overrides:
getSignaturein classAbstractQueryModelNode- Returns:
- The node's signature, e.g. SLICE (offset=10, limit=10).
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equals
Description copied from interface:QueryModelNodeReturns true if this query model node and its children are recursively equal to o and its children.- Specified by:
equalsin interfaceQueryModelNode- Overrides:
equalsin classObject
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hashCode
public int hashCode() -
clone
Description copied from interface:QueryModelNodeReturns a (deep) clone of this query model node. This method recursively clones the entire node tree, starting from this nodes.- Specified by:
clonein interfaceQueryModelNode- Specified by:
clonein interfaceTupleExpr- Overrides:
clonein classAbstractQueryModelNode- Returns:
- A deep clone of this query model node.
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getSupportedOrders
- Specified by:
getSupportedOrdersin interfaceTupleExpr
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setOrder
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shouldCacheCardinality
protected boolean shouldCacheCardinality()- Overrides:
shouldCacheCardinalityin 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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