/*
 *    GeoTools - The Open Source Java GIS Toolkit
 *    http://geotools.org
 *
 *    (C) 2011, Open Source Geospatial Foundation (OSGeo)
 *    (C) 2003-2005, Open Geospatial Consortium Inc.
 *    
 *    All Rights Reserved. http://www.opengis.org/legal/
 */
package org.opengis.geometry.complex;

import java.util.Collection;
import org.opengis.geometry.primitive.Primitive;
import org.opengis.annotation.Association;
import org.opengis.annotation.UML;

import static org.opengis.annotation.Obligation.*;
import static org.opengis.annotation.Specification.*;


/**
 * A geometric complex with an underlying core geometry that is isomorphic to a primitive. Thus,
 * a composite curve is a collection of curves whose geometry interface could be satisfied by a
 * single curve (albeit a much more complex one). Composites are intended for use as attribute
 * values in datasets in which the underlying geometry has been decomposed, usually to expose its
 * topological nature.
 *
 *
 * @source $URL: http://svn.osgeo.org/geotools/trunk/modules/library/opengis/src/main/java/org/opengis/geometry/complex/Composite.java $
 * @version <A HREF="http://www.opengeospatial.org/standards/as">ISO 19107</A>
 * @author Martin Desruisseaux (IRD)
 * @since GeoAPI 1.0
 */
@UML(identifier="GM_Composite", specification=ISO_19107)
public interface Composite extends Complex {
    /**
     * Returns a homogeneous collection of {@linkplain Primitive primitives} whose union would be
     * the core geometry of the composite. The complex would include all primitives in the generator
     * and all primitives on the boundary of these primitives, and so forth until
     * {@linkplain org.opengis.geometry.primitive.Point points} are included. Thus the
     * {@code generators} on {@code Composite} is a subset of the
     * {@linkplain Complex#getElements elements} on {@linkplain Complex complex}.
     *
     * @return The list of primitives in this composite.
     *
     * @see CompositePoint#getGenerators
     * @see CompositeCurve#getGenerators
     * @see CompositeSurface#getGenerators
     * @see CompositeSolid#getGenerators
     */
    @Association("Composition")
    @UML(identifier="generator", obligation=MANDATORY, specification=ISO_19107)
    Collection<? extends Primitive> getGenerators();
}