Package org.eclipse.rdf4j.query.algebra
Class LeftJoin
java.lang.Object
org.eclipse.rdf4j.query.algebra.AbstractQueryModelNode
org.eclipse.rdf4j.query.algebra.BinaryTupleOperator
org.eclipse.rdf4j.query.algebra.LeftJoin
- All Implemented Interfaces:
Serializable,Cloneable,GraphPatternGroupable,QueryModelNode,TupleExpr,VariableScopeChange
- Direct Known Subclasses:
FedXLeftJoin
The LeftJoin operator, as defined in SPARQL Query
Language for RDF.
- Author:
- Arjohn Kampman
- See Also:
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Field Summary
Fields inherited from class org.eclipse.rdf4j.query.algebra.BinaryTupleOperator
leftArg, rightArg -
Constructor Summary
Constructors -
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.booleaninthashCode()voidreplaceChildNode(QueryModelNode current, QueryModelNode replacement) Default implementation ofQueryModelNode.replaceChildNode(QueryModelNode, QueryModelNode)that throws anIllegalArgumentExceptionindicating that current is not a child node of this node.voidsetCondition(ValueExpr condition) <X extends Exception>
voidvisit(QueryModelVisitor<X> visitor) Visits this node.<X extends Exception>
voidvisitChildren(QueryModelVisitor<X> visitor) Dummy implementation ofQueryModelNode.visitChildren(org.eclipse.rdf4j.query.algebra.QueryModelVisitor<X>)that does nothing.Methods inherited from class org.eclipse.rdf4j.query.algebra.BinaryTupleOperator
getAlgorithmName, getLeftArg, getRightArg, setAlgorithm, setAlgorithm, setLeftArg, setRightArgMethods inherited from class org.eclipse.rdf4j.query.algebra.AbstractQueryModelNode
getCardinality, getCostEstimate, getParentNode, getResultSizeActual, getResultSizeEstimate, getSignature, getTotalTimeNanosActual, isCardinalitySet, isGraphPatternGroup, isVariableScopeChange, nullEquals, replaceNodeInList, replaceWith, resetCardinality, setCardinality, setCostEstimate, setGraphPatternGroup, setParentNode, setResultSizeActual, setResultSizeEstimate, setTotalTimeNanosActual, setVariableScopeChange, shouldCacheCardinality, 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, getSignature, getTotalTimeNanosActual, replaceWith, setCostEstimate, setParentNode, setResultSizeActual, setResultSizeEstimate, setTotalTimeNanosActual, toString
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Constructor Details
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LeftJoin
public LeftJoin() -
LeftJoin
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LeftJoin
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Method Details
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getCondition
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setCondition
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hasCondition
public boolean hasCondition() -
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.- 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.- Returns:
- A set of binding names.
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visit
Description copied from interface:QueryModelNodeVisits this node. The node reports itself to the visitor with the proper runtime type.- Throws:
X extends Exception
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visitChildren
Description copied from class:AbstractQueryModelNodeDummy implementation ofQueryModelNode.visitChildren(org.eclipse.rdf4j.query.algebra.QueryModelVisitor<X>)that does nothing. Subclasses should override this method when they have child nodes.- Specified by:
visitChildrenin interfaceQueryModelNode- Overrides:
visitChildrenin classBinaryTupleOperator- Throws:
X extends Exception
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replaceChildNode
Description copied from class:AbstractQueryModelNodeDefault implementation ofQueryModelNode.replaceChildNode(QueryModelNode, QueryModelNode)that throws anIllegalArgumentExceptionindicating that current is not a child node of this node.- Specified by:
replaceChildNodein interfaceQueryModelNode- Overrides:
replaceChildNodein classBinaryTupleOperator- Parameters:
current- The current child node.replacement- The new child node.
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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 classBinaryTupleOperator
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hashCode
public int hashCode()- Overrides:
hashCodein classBinaryTupleOperator
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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 classBinaryTupleOperator- Returns:
- A deep clone of this query model node.
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