org.openrdf.sesame.sail.query
Class SetOperator

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

All Implemented Interfaces:

Query

Direct Known Subclasses:

Intersect, Minus, Union

public abstract class SetOperator

extends Object

implements Query

Generic set operator. Concrete set operations are union, intersection, and minus.

Author:

Jeen Broekstra

Constructor Summary

SetOperator(Query leftArg, Query rightArg, boolean all)

Method Summary

String[]	getColumnHeaders() Gets the headers for the results table that is produced by this query.
Query	getLeftArg()
Query	getRightArg()
void	getVariables(Collection variables) Gets all variables that are used in this query.

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.openrdf.sesame.sail.query.Query

evaluate

Constructor Detail

SetOperator

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

Method Detail

getLeftArg

public Query getLeftArg()

getRightArg

public Query getRightArg()

getVariables

public void getVariables(Collection variables)

Description copied from interface: Query

Gets all variables that are used in this query.

Specified by:

getVariables in interface Query

Parameters:

variables - A Collection to add the Var objects to.

getColumnHeaders

public String[] getColumnHeaders()

Description copied from interface: Query

Gets the headers for the results table that is produced by this query.

Specified by:

getColumnHeaders in interface Query

Returns:

An array containing as much strings as there are values in each query result.