org.openrdf.query.algebra
Class Join

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

All Implemented Interfaces:

Cloneable, QueryModelNode, TupleExpr

public class Join
extends BinaryTupleOperator

A natural join between two tuple expressions.

Field Summary

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

leftArg, rightArg

Constructor Summary

Join()

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

Method Summary

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()
<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, nullEquals, replaceNodeInList, replaceWith, setParentNode, toString

Methods inherited from class java.lang.Object

finalize, getClass, notify, notifyAll, wait, wait, wait

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

getParentNode, getSignature, replaceWith, setParentNode, toString

Constructor Detail

Join

public Join()

Join

public Join(TupleExpr leftArg,
            TupleExpr rightArg)

Creates a new natural join 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

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.