org.openrdf.sesame.sail.query
Class Exists

java.lang.Object
  org.openrdf.sesame.sail.query.Exists

All Implemented Interfaces:

BooleanExpr

public class Exists

extends Object

implements BooleanExpr

Checks whether the wrapped Query produces any results.

Constructor Summary

Exists(Query qc)

Method Summary

Query	getArg()
void	getVariables(Collection variables) Gets all variables that are used in this BooleanExpr.
boolean	isTrue(RdfSource rdfSource) Evaluates the boolean expression on the supplied RdfSource object.
String	toString()

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, wait, wait, wait

Constructor Detail

Exists

public Exists(Query qc)

Method Detail

getArg

public Query getArg()

getVariables

public void getVariables(Collection variables)

Description copied from interface: BooleanExpr

Gets all variables that are used in this BooleanExpr.

Specified by:

getVariables in interface BooleanExpr

Parameters:

variables - A Collection to add the Var objects to.

isTrue

public boolean isTrue(RdfSource rdfSource)
               throws SailQueryException

Description copied from interface: BooleanExpr

Evaluates the boolean expression on the supplied RdfSource object.

Specified by:

isTrue in interface BooleanExpr

Parameters:

rdfSource - The RdfSource to evaluate the boolean expression against.

Returns:

the result of the evaluation.

Throws:

SailQueryException

toString

public String toString()