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 {Iver T.I.}   {Task}

 */

package org.gvsig.fmap.geom.aggregate;

import org.gvsig.fmap.geom.Geometry;

import org.gvsig.fmap.geom.primitive.Primitive;

/**

 * <p>

 * This interface is equivalent to the GM_Aggregate specified in 

 * <a href="http://www.iso.org/iso/iso_catalogue/catalogue_tc/catalogue_detail.htm?csnumber=26012">ISO 19107</a>.

 * The aggregates gather geometric objects. Since they will often use orientation 

 * modification, the curve reference and surface references do not go directly to 

 * the {@link Curve} and {@link Surface}, but are directed to {@link OrientableCurve} 

 * and {@link OrientableSurface}.

 * </p>

 * <p>

 * Most geometric objects are contained in features, and cannot be held in 

 * collections that are strong aggregations. For this reason, the collections 

 * described on this package are all weak aggregations, and shall use 

 * references to include geometric objects. 

 * </p> 

 * @see <a href="http://www.iso.org/iso/iso_catalogue/catalogue_tc/catalogue_detail.htm?csnumber=26012">ISO 19107</a>

 * @author <a href="mailto:jpiera@gvsig.org">Jorge Piera</a>

 */

public interface Aggregate extends Geometry{        

        /**

         * Returns the number of {@link Primitive}'s that composes

         * this multi geometry.

         * @return the number of {@link Primitive}'s that composes

         * this multi geometry.

         */

        public int getPrimitivesNumber();

        /**

         * Returns one of the {@link Primitive}'s that is in

         * a concrete position.

         * @param i

         * Geometry position.

         * @return

         * A simple geometry.

         */

        public Primitive getPrimitiveAt(int i);

}