001package ca.uhn.fhir.rest.server;
002
003/*
004 * #%L
005 * HAPI FHIR - Core Library
006 * %%
007 * Copyright (C) 2014 - 2017 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.util.CoverageIgnore;
030
031/**
032 * Utility methods for working with {@link IBundleProvider}
033 */
034public class BundleProviders {
035
036        /** Non instantiable */
037        @CoverageIgnore
038        private BundleProviders() {
039                //nothing
040        }
041
042        /**
043         * Create a new unmodifiable empty resource list with the current time as the publish date.
044         */
045        public static IBundleProvider newEmptyList() {
046                final InstantDt published = InstantDt.withCurrentTime();
047                return new IBundleProvider() {
048                        @Override
049                        public List<IBaseResource> getResources(int theFromIndex, int theToIndex) {
050                                return Collections.emptyList();
051                        }
052
053                        @Override
054                        public Integer size() {
055                                return 0;
056                        }
057
058                        @Override
059                        public InstantDt getPublished() {
060                                return published;
061                        }
062
063                        @Override
064                        public Integer preferredPageSize() {
065                                return null;
066                        }
067
068                        @Override
069                        public String getUuid() {
070                                return null;
071                        }
072                };
073        }
074
075        public static IBundleProvider newList(IBaseResource theResource) {
076                return new SimpleBundleProvider(theResource);
077        }
078
079        public static IBundleProvider newList(List<IBaseResource> theResources) {
080                return new SimpleBundleProvider(theResources);
081        }
082}