001package ca.uhn.fhir.rest.server;
002
003/*
004 * #%L
005 * HAPI FHIR - Server Framework
006 * %%
007 * Copyright (C) 2014 - 2019 University Health Network
008 * %%
009 * Licensed under the Apache License, Version 2.0 (the "License");
010 * you may not use this file except in compliance with the License.
011 * You may obtain a copy of the License at
012 * 
013 *      http://www.apache.org/licenses/LICENSE-2.0
014 * 
015 * Unless required by applicable law or agreed to in writing, software
016 * distributed under the License is distributed on an "AS IS" BASIS,
017 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
018 * See the License for the specific language governing permissions and
019 * limitations under the License.
020 * #L%
021 */
022
023import java.util.Collections;
024import java.util.List;
025
026import org.hl7.fhir.instance.model.api.IBaseResource;
027
028import ca.uhn.fhir.model.primitive.InstantDt;
029import ca.uhn.fhir.rest.api.server.IBundleProvider;
030import ca.uhn.fhir.util.CoverageIgnore;
031
032/**
033 * Utility methods for working with {@link IBundleProvider}
034 */
035public class BundleProviders {
036
037        /** Non instantiable */
038        @CoverageIgnore
039        private BundleProviders() {
040                //nothing
041        }
042
043        /**
044         * Create a new unmodifiable empty resource list with the current time as the publish date.
045         */
046        public static IBundleProvider newEmptyList() {
047                final InstantDt published = InstantDt.withCurrentTime();
048                return new IBundleProvider() {
049                        @Override
050                        public List<IBaseResource> getResources(int theFromIndex, int theToIndex) {
051                                return Collections.emptyList();
052                        }
053
054                        @Override
055                        public Integer size() {
056                                return 0;
057                        }
058
059                        @Override
060                        public InstantDt getPublished() {
061                                return published;
062                        }
063
064                        @Override
065                        public Integer preferredPageSize() {
066                                return null;
067                        }
068
069                        @Override
070                        public String getUuid() {
071                                return null;
072                        }
073                };
074        }
075
076        public static IBundleProvider newList(IBaseResource theResource) {
077                return new SimpleBundleProvider(theResource);
078        }
079
080        public static IBundleProvider newList(List<IBaseResource> theResources) {
081                return new SimpleBundleProvider(theResources);
082        }
083}