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:
    Serialized Form

- - ### Field Summary

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

      `leftArg, rightArg`

  - ### Constructor Summary

    Constructors
    Constructor and Description
    `Join()`
    `Join(TupleExpr leftArg, TupleExpr rightArg)` Creates a new natural join operator.

  - ### Method Summary

    All Methods Instance Methods Concrete Methods Deprecated Methods
    Modifier and Type | Method and Description
    --- | ---
    `Join` | `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()`
    `boolean` | `hasSubSelectInRightArg()` Deprecated. since 2.0. Use `TupleExprs.containsProjection(TupleExpr)` instead.
    `<X extends Exception> void` | `visit(QueryModelVisitor<X> visitor)` Visits this node.

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

      `getAlgorithmName, getLeftArg, getRightArg, replaceChildNode, setAlgorithm, setLeftArg, setRightArg, visitChildren`

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

      `getCostEstimate, getParentNode, getResultSizeActual, getResultSizeEstimate, getSignature, getTotalTimeNanosActual, isGraphPatternGroup, isVariableScopeChange, nullEquals, replaceNodeInList, replaceWith, setCostEstimate, setGraphPatternGroup, setParentNode, setResultSizeActual, setResultSizeEstimate, setTotalTimeNanosActual, setVariableScopeChange, 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 Detail

    - #### Join

          public Join()

    - #### Join

          public Join(TupleExpr leftArg,
                      TupleExpr rightArg)

      Creates a new natural join operator.

  - ### Method Detail

    - #### hasSubSelectInRightArg

          @Deprecated
          public boolean hasSubSelectInRightArg()

      Deprecated. since 2.0. 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 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`

    - #### 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.

Copyright © 2015-2022 Eclipse Foundation. All Rights Reserved.