/*
 *    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.primitive;

import org.opengis.geometry.complex.CompositeCurve;
import org.opengis.annotation.Association;
import org.opengis.annotation.UML;

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


/**
 * A curve and an orientation inherited from {@link OrientablePrimitive}. If the orientation is
 * positive, then the {@code OrientableCurve} is a {@linkplain Curve curve}. If the orientation
 * is negative, then the {@code OrientableCurve} is related to another {@linkplain Curve curve}
 * with a parameterization that reverses the sense of the curve traversal.
 *
 *
 * @source $URL: http://svn.osgeo.org/geotools/trunk/modules/library/opengis/src/main/java/org/opengis/geometry/primitive/OrientableCurve.java $
 * @version <A HREF="http://www.opengeospatial.org/standards/as">ISO 19107</A>
 * @author Martin Desruisseaux (IRD)
 * @since GeoAPI 1.0
 */
@UML(identifier="GM_OrientableCurve", specification=ISO_19107)
public interface OrientableCurve extends OrientablePrimitive {
    /**
     * Returns an ordered pair of points, which are the start point and end point of the curve.
     * If the curve is closed, then the boundary shall be empty.
     *
     * @return The sets of positions on the boundary.
     */
    @UML(identifier="boundary", obligation=MANDATORY, specification=ISO_19107)
    CurveBoundary getBoundary();

    /**
     * Returns the primitive associated with this {@code OrientableCurve}.
     *
     * @return The primitive, or {@code null} if the association is
     *         not available or not implemented that way.
     *
     * @see Curve#getProxy
     * @issue http://jira.codehaus.org/browse/GEO-63
     */
    @Association("Oriented")
    @UML(identifier="primitive", obligation=OPTIONAL, specification=ISO_19107)
    Curve getPrimitive();

    /**
     * Returns the owner of this orientable curve. This method is <em>optional</em> since
     * the association in ISO 19107 is navigable only from {@code CompositeCurve} to
     * {@code OrientableCurve}, not the other way.
     *
     * @return The owner of this orientable curve, or {@code null} if the association is
     *         not available or not implemented that way.
     *
     * @see CompositeCurve#getGenerators
     * @issue http://jira.codehaus.org/browse/GEO-63
     */
    @Association("Composition")
    @UML(identifier="composite", obligation=OPTIONAL, specification=ISO_19107)
    CompositeCurve getComposite();
}