org.openrdf.sesame.sail.query
Class Union

java.lang.Object
  org.openrdf.sesame.sail.query.SetOperator
      org.openrdf.sesame.sail.query.Union

All Implemented Interfaces:

Query

public class Union

extends SetOperator

Determines the union of two sets of values that are produced by queries.

Author:

Jeen Broekstra

Constructor Summary

Union(Query leftArg, Query rightArg, boolean all)
Creates a new Union object that reports the union of the query answers that are reported by both the left- and right argument.

Method Summary

void	evaluate(RdfSource rdfSource, QueryAnswerListener listener) Evaluates the query on the data contained in the supplied RdfSource and reports the results to the supplied QueryAnswerListener.
String	toString()

Methods inherited from class org.openrdf.sesame.sail.query.SetOperator

getColumnHeaders, getLeftArg, getRightArg, getVariables

Methods inherited from class java.lang.Object

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

Constructor Detail

Union

public Union(Query leftArg,
             Query rightArg,
             boolean all)

Creates a new Union object that reports the union of the query answers that are reported by both the left- and right argument.

Method Detail

evaluate

public void evaluate(RdfSource rdfSource,
                     QueryAnswerListener listener)
              throws SailQueryException

Description copied from interface: Query

Evaluates the query on the data contained in the supplied RdfSource and reports the results to the supplied QueryAnswerListener.

Parameters:

rdfSource - An RdfSource containing the data to evaluate the query on.

listener - A QueryAnswerListener that will receive any query results.

Throws:

SailQueryException - An exception indicating that the query evaluation was stopped abnormally.

toString

public String toString()