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

import org.opengis.annotation.Association;
import org.opengis.annotation.UML;
import org.opengis.geometry.coordinate.GenericSurface;

/**
 * Defines a homogeneous portion of a {@linkplain Surface surface}. Each {@code SurfacePatch} shall
 * be in at most one {@linkplain Surface surface}.
 *
 * @version ISO 19107
 * @author Martin Desruisseaux (IRD)
 * @since GeoAPI 1.0
 */
@UML(identifier = "GM_SurfacePatch", specification = ISO_19107)
public interface SurfacePatch extends GenericSurface {
    /**
     * Returns the patch which own this surface patch. This method is optional since the
     * association in ISO 19107 is navigable only from {@code Surface} to {@code SurfacePatch}, not
     * the other way.
     *
     * 
     *
     *  NOTE: In the specification, surface patches do not appear
     * except in the context of a surface, and therefore this method should never returns {@code
     * null} which would preclude the use of surface patches except in this manner. While this would
     * not affect the specification, allowing {@code null} owner allows other standards based on ISO
     * 19107 one to use surface patches in a more open-ended manner. 
     *
     * 
     *
     * @return The owner of this surface patch, or {@code null} if the association is not available
     *     or not implemented that way.
     * @see Surface#getPatches
     * @see CurveSegment#getCurve
     * @issue http://jira.codehaus.org/browse/GEO-63
     */
    @Association("Segmentation")
    @UML(identifier = "surface", obligation = OPTIONAL, specification = ISO_19107)
    Surface getSurface();

    /**
     * Determines the surface interpolation mechanism used for this {@code SurfacePatch}. This
     * mechanism uses the control points and control parameters defined in the various subclasses to
     * determine the position of this {@code SurfacePatch}.
     *
     * @return The interpolation mechanism.
     */
    @UML(identifier = "interpolation", obligation = MANDATORY, specification = ISO_19107)
    SurfaceInterpolation getInterpolation();

    /**
     * Specifies the type of continuity between this surface patch and its immediate neighbors with
     * which it shares a boundary curve. The sequence of values corresponds to the {@linkplain Ring
     * rings} in the {@linkplain SurfaceBoundary surface boundary} returned by {@link #getBoundary}
     * for this patch. The default value of "0" means simple continuity, which is a mandatory
     * minimum level of continuity. This level is referred to as "C⁰" in mathematical
     * texts. A value of 1 means that the functions are continuous and differentiable at the
     * appropriate end point: "C¹" continuity. A value of "n" for any integer means
     * n-times differentiable: "Cⁿ" continuity.
     *
     * @return The type of continuity between this surface patch and its immediate neighbors.
     */
    @UML(identifier = "numDerivativesOnBoundary", obligation = MANDATORY, specification = ISO_19107)
    int getNumDerivativesOnBoundary();

    /**
     * Returns the boundary of this {@code SurfacePatch} represented as a collection of {@linkplain
     * OrientableCurve orientable curves} organized into {@linkplain Ring rings} by a {@linkplain
     * SurfaceBoundary surface boundary}. The semantics of this operation is the same as that of
     * {@link Surface#getBoundary()}, except that the curves used here may be not be persistent
     * {@linkplain OrientableCurve orientable curve} instances. Transient data type values of
     * {@linkplain Curve curve} are also valid. In the normal case, {@code SurfacePatch}es will
     * share parts of their boundary with the aggregate {@linkplain Surface surface}, and other
     * parts with {@code SurfacePatch}es (not necessarily distinct).
     *
     * @return The boundary of this {@code SurfacePatch}
     */
    @UML(identifier = "boundary", obligation = MANDATORY, specification = ISO_19107)
    SurfaceBoundary getBoundary();
}