Package org.eclipse.rdf4j.query.algebra
Class QueryRoot
- java.lang.Object
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- org.eclipse.rdf4j.query.algebra.AbstractQueryModelNode
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- org.eclipse.rdf4j.query.algebra.UnaryTupleOperator
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- org.eclipse.rdf4j.query.algebra.QueryRoot
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- All Implemented Interfaces:
Serializable
,Cloneable
,GraphPatternGroupable
,QueryModelNode
,TupleExpr
,VariableScopeChange
- Direct Known Subclasses:
PrecompiledQueryNode
public class QueryRoot extends UnaryTupleOperator
A semantics-less query model node that is used as the root of query model trees. This is a placeholder that facilitates modifications to query model trees, including the replacement of the actual (semantically relevant) root node with another root node.- 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.UnaryTupleOperator
arg
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description QueryRoot
clone()
Returns a (deep) clone of this query model node.boolean
equals(Object other)
Returns true if this query model node and its children are recursively equal to o and its children.QueryModelNode
getParentNode()
Gets the node's parent.int
hashCode()
void
setParentNode(QueryModelNode parent)
Sets the node's parent.<X extends Exception>
voidvisit(QueryModelVisitor<X> visitor)
Visits this node.-
Methods inherited from class org.eclipse.rdf4j.query.algebra.UnaryTupleOperator
getArg, getAssuredBindingNames, getBindingNames, replaceChildNode, setArg, visitChildren
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Methods inherited from class org.eclipse.rdf4j.query.algebra.AbstractQueryModelNode
getCardinality, getCostEstimate, getResultSizeActual, getResultSizeEstimate, getSignature, getTotalTimeNanosActual, isCardinalitySet, isGraphPatternGroup, isVariableScopeChange, nullEquals, replaceNodeInList, replaceWith, resetCardinality, setCardinality, setCostEstimate, setGraphPatternGroup, 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, getResultSizeActual, getResultSizeEstimate, getSignature, getTotalTimeNanosActual, replaceWith, setCostEstimate, setResultSizeActual, setResultSizeEstimate, setTotalTimeNanosActual, toString
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Constructor Detail
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QueryRoot
public QueryRoot()
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QueryRoot
public QueryRoot(TupleExpr tupleExpr)
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Method Detail
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setParentNode
public void setParentNode(QueryModelNode parent)
Description copied from interface:QueryModelNode
Sets the node's parent.- Specified by:
setParentNode
in interfaceQueryModelNode
- Overrides:
setParentNode
in classAbstractQueryModelNode
- Parameters:
parent
- The parent node for this node.
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getParentNode
public QueryModelNode getParentNode()
Description copied from interface:QueryModelNode
Gets the node's parent.- Specified by:
getParentNode
in interfaceQueryModelNode
- Overrides:
getParentNode
in classAbstractQueryModelNode
- Returns:
- The parent node, if any.
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visit
public <X extends Exception> void visit(QueryModelVisitor<X> visitor) throws X extends Exception
Description copied from interface:QueryModelNode
Visits this node. The node reports itself to the visitor with the proper runtime type.- Throws:
X extends Exception
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equals
public boolean equals(Object other)
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 classUnaryTupleOperator
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hashCode
public int hashCode()
- Overrides:
hashCode
in classUnaryTupleOperator
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clone
public QueryRoot 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 classUnaryTupleOperator
- Returns:
- A deep clone of this query model node.
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