org.openrdf.query.algebra
Class Exists

java.lang.Object
  org.openrdf.query.algebra.QueryModelNodeBase
      org.openrdf.query.algebra.SubQueryValueOperator
          org.openrdf.query.algebra.Exists

All Implemented Interfaces:

Cloneable, QueryModelNode, ValueExpr

public class Exists
extends SubQueryValueOperator

Checks whether the wrapped Query produces any results.

Field Summary

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

subQuery

Constructor Summary

Exists()

Exists(TupleExpr subQuery)

Method Summary

Exists	clone() Returns a (deep) clone of this query model node.
<X extends Exception> void	visit(QueryModelVisitor<X> visitor) Visits this node.

Methods inherited from class org.openrdf.query.algebra.SubQueryValueOperator

getSubQuery, replaceChildNode, setSubQuery, visitChildren

Methods inherited from class org.openrdf.query.algebra.QueryModelNodeBase

getParentNode, getSignature, replaceWith, setParentNode, toString

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, replaceWith, setParentNode, toString

Constructor Detail

Exists

public Exists()

Exists

public Exists(TupleExpr subQuery)

Method Detail

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

clone

public Exists 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 ValueExpr

Overrides:

clone in class SubQueryValueOperator

Returns:

A deep clone of this query model node.