org.openrdf.query.algebra
Class Union

java.lang.Object
  org.openrdf.query.algebra.QueryModelNodeBase
      org.openrdf.query.algebra.BinaryTupleOperator
          org.openrdf.query.algebra.Union

All Implemented Interfaces:

Cloneable, QueryModelNode, TupleExpr

public class Union
extends BinaryTupleOperator

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

Field Summary

Fields inherited from class org.openrdf.query.algebra.BinaryTupleOperator

leftArg, rightArg

Constructor Summary

Union()

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

Method Summary

Union	clone() Returns a (deep) clone of this query model node.
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.
<X extends Exception> void	visit(QueryModelVisitor<X> visitor) Visits this node.

Methods inherited from class org.openrdf.query.algebra.BinaryTupleOperator

getLeftArg, getRightArg, replaceChildNode, setLeftArg, setRightArg, visitChildren

Methods inherited from class org.openrdf.query.algebra.QueryModelNodeBase

getParentNode, getSignature, replaceWith, setParentNode, toString

Methods inherited from class java.lang.Object

equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Methods inherited from interface org.openrdf.query.algebra.QueryModelNode

getParentNode, getSignature, replaceWith, setParentNode, toString

Constructor Detail

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 Detail

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 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

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.