org.openrdf.sesame.query.rql.model
Class Union

java.lang.Object
  org.openrdf.sesame.query.rql.model.Union

All Implemented Interfaces:

Query, ResourceQuery, SetQuery

public class Union

extends Object

implements SetQuery

Union represents a set query where the result is the union of the result sets of the two arguments. The arguments must be select-from-where queries which have the same number of items in their select clause. Query syntax: ( select .... from .... [where ....]? ) union ( select .... from .... [where ....]? )

Version:

$Revision: 1.7.2.2 $

Author:

Jeen Broekstra

Constructor Summary

Union(SfwQuery query1, SfwQuery query2)

Method Summary

void	evaluate(RdfSchemaSource rss, TableQueryResultListener listener)
SfwQuery	getArg1()
SfwQuery	getArg2()
String	getQuery()
ValueIterator	getResources(RdfSchemaSource rss)
boolean	returnsSet()
String	toString()

Methods inherited from class java.lang.Object

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

Constructor Detail

Union

public Union(SfwQuery query1,
             SfwQuery query2)

Method Detail

evaluate

public void evaluate(RdfSchemaSource rss,
                     TableQueryResultListener listener)
              throws QueryEvaluationException

Specified by:

evaluate in interface ResourceQuery

Throws:

QueryEvaluationException

getResources

public ValueIterator getResources(RdfSchemaSource rss)

Specified by:

getResources in interface ResourceQuery

returnsSet

public boolean returnsSet()

Specified by:

returnsSet in interface ResourceQuery

getArg1

public SfwQuery getArg1()

Specified by:

getArg1 in interface SetQuery

getArg2

public SfwQuery getArg2()

Specified by:

getArg2 in interface SetQuery

getQuery

public String getQuery()

Specified by:

getQuery in interface Query

toString

public String toString()