/*
* Lokomo OneCMDB - An Open Source Software for Configuration
* Management of Datacenter Resources
*
* Copyright (C) 2006 Lokomo Systems AB
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or (at
* your option) any later version.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
* 02110-1301 USA.
*
* Lokomo Systems AB can be contacted via e-mail: info@lokomo.com or via
* paper mail: Lokomo Systems AB, Sv�rdv�gen 27, SE-182 33
* Danderyd, Sweden.
*
*/
package org.onecmdb.core.utils.transform;
import java.io.IOException;
/**
* Interface <code>IAttributeSelector</code> selects an attribute from a IInstance object.<br/>
* The IInstance object is a <em>row</em> of instance data.<br/>
* the IAttributeSelector convert one or many <em>columns</em> to an IAttributeValue.<br/>
* <br/>
* The natural key specifies of this attribute is to be used as a natural key for the instance<br>
* Each IInstance can contain zero natural key's, the each IInstance row is regarded as<br/>
* a new instance. The combination of natural keys for a IInstance must be unique for the dataset.</br>
*/
public interface IAttributeSelector {
public String getName();
public boolean isNaturalKey();
public IAttributeValue getAttribute(IInstance row) throws IOException;
}