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:

  • 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.