Package org.eclipse.rdf4j.query.algebra

Class Join

java.lang.Object
org.eclipse.rdf4j.query.algebra.AbstractQueryModelNode
org.eclipse.rdf4j.query.algebra.BinaryTupleOperator
org.eclipse.rdf4j.query.algebra.Join
All Implemented Interfaces:
Serializable, Cloneable, GraphPatternGroupable, QueryModelNode, TupleExpr, VariableScopeChange
public class Join extends BinaryTupleOperator
A natural join between two tuple expressions.
See Also:

  • Constructor Details

    • Join

      public Join()

    • Join

      public Join(TupleExpr leftArg, TupleExpr rightArg)
      Creates a new natural join operator.

  • Method Details

    • hasSubSelectInRightArg

      @Deprecated(since="2.0") public boolean hasSubSelectInRightArg()
      Deprecated.
      Use TupleExprs.containsProjection(TupleExpr) instead.
      Returns:
      true if the right argument of this Join contains a projection, false otherwise.

    • 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 Join 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.