org.jrdf.query.relation.operation.mem.project
Class ProjectImpl

java.lang.Object
  org.jrdf.query.relation.operation.mem.project.ProjectImpl

All Implemented Interfaces:

Project

public class ProjectImpl
extends Object
implements Project

Implements restrict by going through the relation and removing the columns.

Version:

$Revision:$

Author:

Andrew Newman

Constructor Summary

ProjectImpl(TupleFactory tupleFactory, RelationFactory relationFactory)

Method Summary

Relation	exclude(Relation relation, Set<Attribute> attributes) The attributes to exclude in the project.
Relation	include(Relation relation, Set<Attribute> attributes) The attributes to include in the projection.

Methods inherited from class java.lang.Object

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

Constructor Detail

ProjectImpl

public ProjectImpl(TupleFactory tupleFactory,
                   RelationFactory relationFactory)

Method Detail

include

public Relation include(Relation relation,
                        Set<Attribute> attributes)

Description copied from interface: Project

The attributes to include in the projection. This is the usual idea of project found in SQL's SELECT for example. Will overwrite any existing inclusion or exclusion.

Specified by:

include in interface Project

attributes - the set of attributes to keep during projection.

exclude

public Relation exclude(Relation relation,
                        Set<Attribute> attributes)

Description copied from interface: Project

The attributes to exclude in the project. Will overwrite any existing inclusion or exclusion.

Specified by:

exclude in interface Project

attributes - the set of attributes to remove during projection.