Package org.eclipse.rdf4j.query.algebra

Class Exists

java.lang.Object

org.eclipse.rdf4j.query.algebra.AbstractQueryModelNode

org.eclipse.rdf4j.query.algebra.SubQueryValueOperator

org.eclipse.rdf4j.query.algebra.Exists

All Implemented Interfaces:

Serializable, Cloneable, GraphPatternGroupable, QueryModelNode, ValueExpr, VariableScopeChange

public class Exists
extends SubQueryValueOperator

Checks whether the wrapped Query produces any results.

See Also:

• Serialized Form

Field Summary

Fields inherited from class org.eclipse.rdf4j.query.algebra.SubQueryValueOperator

subQuery

Constructor Summary

Constructors

Constructor	Description
Exists()
Exists(TupleExpr subQuery)

Method Summary

Modifier and Type	Method	Description
Exists	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.
int	hashCode()
<X extends Exception> void	visit(QueryModelVisitor<X> visitor)	Visits this node.

Methods inherited from class org.eclipse.rdf4j.query.algebra.SubQueryValueOperator

getSubQuery, replaceChildNode, setSubQuery, visitChildren

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

Methods inherited from class java.lang.Object

finalize, getClass, notify, notifyAll, wait, wait, wait

Methods inherited from interface org.eclipse.rdf4j.query.algebra.QueryModelNode

getCostEstimate, getParentNode, getResultSizeActual, getResultSizeEstimate, getSignature, getTotalTimeNanosActual, replaceWith, setCostEstimate, setParentNode, setResultSizeActual, setResultSizeEstimate, setTotalTimeNanosActual, toString

Constructor Details

Exists

public Exists()

Exists

public Exists(TupleExpr subQuery)

Method Details

visit

public <X extends Exception> void visit(QueryModelVisitor<X> visitor)
                                 throws X

Description copied from interface: QueryModelNode

Visits this node. The node reports itself to the visitor with the proper runtime type.

Throws:

X

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 interface QueryModelNode

Overrides:

equals in class SubQueryValueOperator

hashCode

public int hashCode()

Overrides:

hashCode in class SubQueryValueOperator

clone

public Exists 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 interface QueryModelNode

Specified by:

clone in interface ValueExpr

Overrides:

clone in class SubQueryValueOperator

Returns:

A deep clone of this query model node.