001/*-
002 * #%L
003 * HAPI FHIR JPA Model
004 * %%
005 * Copyright (C) 2014 - 2025 Smile CDR, Inc.
006 * %%
007 * Licensed under the Apache License, Version 2.0 (the "License");
008 * you may not use this file except in compliance with the License.
009 * You may obtain a copy of the License at
010 *
011 *      http://www.apache.org/licenses/LICENSE-2.0
012 *
013 * Unless required by applicable law or agreed to in writing, software
014 * distributed under the License is distributed on an "AS IS" BASIS,
015 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
016 * See the License for the specific language governing permissions and
017 * limitations under the License.
018 * #L%
019 */
020package ca.uhn.fhir.jpa.model.util;
021
022import ca.uhn.fhir.jpa.model.entity.ResourceLink;
023
024import static org.apache.commons.lang3.StringUtils.isBlank;
025
026public class ResourceLinkUtils {
027
028        /**
029         * UNKNOWN resource type, used for flagging
030         * canonical urls in ResourceLinks.
031         */
032        public static final String UNKNOWN = "(unknown)";
033
034        /**
035         * Returns true if the target of the resourcelink is a canonical url;
036         * returns false otherwise.
037         */
038        public static boolean isTargetCanonicalUrl(ResourceLink theLink) {
039                return isBlank(theLink.getTargetResourceId())
040                                && theLink.getTargetResourceType().equals(UNKNOWN);
041        }
042}