Package org.eclipse.rdf4j.query.algebra

Class Union

java.lang.Object

org.eclipse.rdf4j.query.algebra.AbstractQueryModelNode

org.eclipse.rdf4j.query.algebra.BinaryTupleOperator

org.eclipse.rdf4j.query.algebra.Union

All Implemented Interfaces:

Serializable, Cloneable, QueryModelNode, TupleExpr, VariableScopeChange

public class Union
extends BinaryTupleOperator

The UNION set operator, which return the union of the result sets of two tuple expressions.

See Also:

• Serialized Form

Field Summary

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

leftArg, rightArg

Constructor Summary

Constructors

Constructor	Description
Union()
Union(TupleExpr leftArg, TupleExpr rightArg)	Creates a new union operator that operates on the two specified arguments.

Method Summary

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

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

getAlgorithmName, getLeftArg, getOrder, getRightArg, getSupportedOrders, replaceChildNode, setAlgorithm, setAlgorithm, setLeftArg, setOrder, setRightArg, visitChildren

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

getCardinality, getCostEstimate, getParentNode, getResultSizeActual, getResultSizeEstimate, getSignature, getTotalTimeNanosActual, isCardinalitySet, isVariableScopeChange, nullEquals, replaceNodeInList, replaceWith, resetCardinality, setCardinality, setCostEstimate, 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

Union

public Union()

Union

public Union(TupleExpr leftArg,
 TupleExpr rightArg)

Creates a new union operator that operates on the two specified arguments.

Parameters:

leftArg - The left argument of the union operator.

rightArg - The right argument of the union operator.

Method Details

getBindingNames

public Set<String> getBindingNames()

Description copied from interface: TupleExpr

Gets 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.

getAssuredBindingNames

public Set<String> getAssuredBindingNames()

Description copied from interface: TupleExpr

Gets 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.

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 BinaryTupleOperator

hashCode

public int hashCode()

Overrides:

hashCode in class BinaryTupleOperator

clone

public Union 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 TupleExpr

Overrides:

clone in class BinaryTupleOperator

Returns:

A deep clone of this query model node.