Package org.eclipse.rdf4j.query.algebra
Class GroupElem
- java.lang.Object
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- org.eclipse.rdf4j.query.algebra.AbstractQueryModelNode
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- org.eclipse.rdf4j.query.algebra.GroupElem
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- All Implemented Interfaces:
java.io.Serializable,java.lang.Cloneable,GraphPatternGroupable,QueryModelNode,VariableScopeChange
public class GroupElem extends AbstractQueryModelNode
A tuple operator that groups tuples that have a specific set of equivalent variable bindings, and that can apply aggregate functions on the grouped results.- See Also:
- Serialized Form
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Field Summary
Fields Modifier and Type Field Description private java.lang.Stringnameprivate AggregateOperatoroperator
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Constructor Summary
Constructors Constructor Description GroupElem(java.lang.String name, AggregateOperator operator)
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description GroupElemclone()Returns a (deep) clone of this query model node.booleanequals(java.lang.Object other)Returns true if this query model node and its children are recursively equal to o and its children.java.lang.StringgetName()AggregateOperatorgetOperator()java.lang.StringgetSignature()Default implementation ofQueryModelNode.getSignature()that prints the name of the node's class.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.voidsetName(java.lang.String name)voidsetOperator(AggregateOperator operator)<X extends java.lang.Exception>
voidvisit(QueryModelVisitor<X> visitor)Visits this node.<X extends java.lang.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.AbstractQueryModelNode
getCardinality, getCostEstimate, getParentNode, getResultSizeActual, getResultSizeEstimate, getTotalTimeNanosActual, isCardinalitySet, isGraphPatternGroup, isVariableScopeChange, nullEquals, replaceNodeInList, replaceWith, resetCardinality, setCardinality, setCostEstimate, setGraphPatternGroup, setParentNode, setResultSizeActual, setResultSizeEstimate, setTotalTimeNanosActual, setVariableScopeChange, shouldCacheCardinality, toHumanReadbleNumber, toString
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Field Detail
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name
private java.lang.String name
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operator
private AggregateOperator operator
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Constructor Detail
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GroupElem
public GroupElem(java.lang.String name, AggregateOperator operator)
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Method Detail
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getName
public java.lang.String getName()
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setName
public void setName(java.lang.String name)
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getOperator
public AggregateOperator getOperator()
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setOperator
public void setOperator(AggregateOperator operator)
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visit
public <X extends java.lang.Exception> void visit(QueryModelVisitor<X> visitor) throws X extends java.lang.Exception
Description copied from interface:QueryModelNodeVisits this node. The node reports itself to the visitor with the proper runtime type.- Throws:
X extends java.lang.Exception
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visitChildren
public <X extends java.lang.Exception> void visitChildren(QueryModelVisitor<X> visitor) throws X extends java.lang.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 classAbstractQueryModelNode- Throws:
X extends java.lang.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 classAbstractQueryModelNode- Parameters:
current- The current child node.replacement- The new child node.
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getSignature
public java.lang.String 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
public boolean equals(java.lang.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 classjava.lang.Object
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hashCode
public int hashCode()
- Overrides:
hashCodein classjava.lang.Object
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clone
public GroupElem 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- Overrides:
clonein classAbstractQueryModelNode- Returns:
- A deep clone of this query model node.
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