001/*
002 *    GeoAPI - Java interfaces for OGC/ISO standards
003 *    Copyright © 2014-2023 Open Geospatial Consortium, Inc.
004 *    http://www.geoapi.org
005 *
006 *    Licensed under the Apache License, Version 2.0 (the "License");
007 *    you may not use this file except in compliance with the License.
008 *    You may obtain a copy of the License at
009 *
010 *        http://www.apache.org/licenses/LICENSE-2.0
011 *
012 *    Unless required by applicable law or agreed to in writing, software
013 *    distributed under the License is distributed on an "AS IS" BASIS,
014 *    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
015 *    See the License for the specific language governing permissions and
016 *    limitations under the License.
017 */
018package org.opengis.metadata.content;
019
020import java.util.Collection;
021import java.util.Collections;
022import org.opengis.annotation.UML;
023
024import static org.opengis.annotation.Obligation.*;
025import static org.opengis.annotation.Specification.ISO_19115;
026
027
028/**
029 * Information about content type for groups of attributes for a specific {@link RangeDimension}.
030 *
031 * @author  Rémi Maréchal (Geomatys)
032 * @version 3.1
033 * @since   3.1
034 *
035 * @see CoverageDescription#getAttributeGroups()
036 */
037@UML(identifier="MD_AttributeGroup", specification=ISO_19115)
038public interface AttributeGroup {
039    /**
040     * Types of information represented by the value(s).
041     *
042     * @return types of information represented by the value(s).
043     */
044    @UML(identifier="contentType", obligation=MANDATORY, specification=ISO_19115)
045    Collection<CoverageContentType> getContentTypes();
046
047    /**
048     * Information on an attribute of the resource.
049     * Returns an empty collection if none.
050     *
051     * @return information on an attribute of the resource.
052     */
053    @UML(identifier="attribute", obligation=OPTIONAL, specification=ISO_19115)
054    default Collection<? extends RangeDimension> getAttributes() {
055        return Collections.emptyList();
056    }
057}