org.openrdf.query.algebra
Class SingletonSet

java.lang.Object
  org.openrdf.query.algebra.QueryModelNodeBase
      org.openrdf.query.algebra.SingletonSet

All Implemented Interfaces:

Cloneable, QueryModelNode, TupleExpr

public class SingletonSet
extends QueryModelNodeBase
implements TupleExpr

A tuple expression that contains exactly one solution with zero bindings.

Constructor Summary

SingletonSet()

Method Summary

SingletonSet	clone() Returns a (deep) clone of this query model node.
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.QueryModelNodeBase

getParentNode, getSignature, replaceChildNode, replaceWith, setParentNode, toString, visitChildren

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, replaceChildNode, replaceWith, setParentNode, toString, visitChildren

Constructor Detail

SingletonSet

public SingletonSet()

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.

Specified by:

getBindingNames in interface TupleExpr

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.

Specified by:

visit in interface QueryModelNode

Throws:

X extends Exception

clone

public SingletonSet 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 QueryModelNodeBase

Returns:

A deep clone of this query model node.