Package org.eclipse.rdf4j.query.algebra
Class LeftJoin
- java.lang.Object
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- org.eclipse.rdf4j.query.algebra.AbstractQueryModelNode
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- org.eclipse.rdf4j.query.algebra.BinaryTupleOperator
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- org.eclipse.rdf4j.query.algebra.LeftJoin
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- All Implemented Interfaces:
Serializable,Cloneable,GraphPatternGroupable,QueryModelNode,TupleExpr,VariableScopeChange
- Direct Known Subclasses:
FedXLeftJoin
public class LeftJoin extends BinaryTupleOperator
The LeftJoin operator, as defined in SPARQL Query Language for RDF.- Author:
- Arjohn Kampman
- See Also:
- Serialized Form
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Field Summary
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Fields inherited from class org.eclipse.rdf4j.query.algebra.BinaryTupleOperator
leftArg, rightArg
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description LeftJoinclone()Returns a (deep) clone of this query model node.booleanequals(Object other)Returns true if this query model node and its children are recursively equal to o and its children.Set<String>getAssuredBindingNames()Gets the names of the bindings that are guaranteed to be present in the results produced by this tuple expression.Set<String>getBindingNames()Gets the names of the bindings that are, or can be, returned by this tuple expression when it is evaluated.ValueExprgetCondition()booleanhasCondition()inthashCode()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, setRightArg
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Methods 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, toString
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Methods inherited from class java.lang.Object
finalize, getClass, notify, notifyAll, wait, wait, wait
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Methods 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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Method Detail
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getCondition
public ValueExpr getCondition()
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setCondition
public void setCondition(ValueExpr condition)
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hasCondition
public boolean hasCondition()
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getBindingNames
public Set<String> 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
public Set<String> 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
public <X extends Exception> void visit(QueryModelVisitor<X> visitor) throws X extends Exception
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
public <X extends Exception> void visitChildren(QueryModelVisitor<X> visitor) throws X extends Exception
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
public void replaceChildNode(QueryModelNode current, QueryModelNode replacement)
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
public boolean equals(Object other)
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
public LeftJoin 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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