Application: gvSIG desktop

/* gvSIG. Geographic Information System of the Valencian Government

*

* Copyright (C) 2007-2008 Infrastructures and Transports Department

* of the Valencian Government (CIT)

* 

* 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.

* 

*/

/*

* AUTHORS (In addition to CIT):

* 2009 Software Colaborativo (www.scolab.es)   development

*/

package org.gvsig.graph.core;

import com.hardcode.gdbms.engine.values.Value;

import com.iver.cit.gvsig.fmap.core.IFeature;

import com.iver.cit.gvsig.fmap.core.IGeometry;

/**

 * @author Francisco Jos? Pe?arrubia (fjp@scolab.es)

 *

 * Useful to deal with layers without fast random access (for example, PostGIS).

 * DefaultFeatureExtractor may use a Layer and va.getFeature().

 * CacheFeatureExtractor may use a cache.

 * This way, the algorithms will be more isolated from refactoring, and porting will be easier.

 */

public interface IFeatureExtractor {

        IFeature getFeature(long i);

        IGeometry getGeometry(long i);

        Value getFieldValue(long idRec, int idField);

        int getNumFeatures();

}