001/*-
002 * #%L
003 * HAPI FHIR JPA Server
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.search;
021
022import ca.uhn.fhir.jpa.api.config.JpaStorageSettings;
023import ca.uhn.fhir.jpa.dao.IFulltextSearchSvc;
024import ca.uhn.fhir.jpa.searchparam.SearchParameterMap;
025import ca.uhn.fhir.rest.api.server.IBundleProvider;
026import ca.uhn.fhir.rest.api.server.RequestDetails;
027import ca.uhn.fhir.rest.server.SimpleBundleProvider;
028import jakarta.annotation.Nullable;
029import org.hl7.fhir.instance.model.api.IBaseResource;
030
031import java.util.Collections;
032import java.util.List;
033import java.util.function.Supplier;
034
035/**
036 * Figure out how we're going to run the query up front, and build a branchless strategy object.
037 */
038public class SearchStrategyFactory {
039        private final JpaStorageSettings myStorageSettings;
040
041        @Nullable
042        private final IFulltextSearchSvc myFulltextSearchSvc;
043
044        public interface ISearchStrategy extends Supplier<IBundleProvider> {}
045
046        // someday
047        //      public class DirectHSearch implements  ISearchStrategy {};
048        //      public class JPAOffsetSearch implements  ISearchStrategy {};
049        //      public class JPASavedSearch implements  ISearchStrategy {};
050        //      public class JPAHybridHSearchSavedSearch implements  ISearchStrategy {};
051        //      public class SavedSearchAdaptorStrategy implements  ISearchStrategy {};
052
053        public SearchStrategyFactory(
054                        JpaStorageSettings theStorageSettings, @Nullable IFulltextSearchSvc theFulltextSearchSvc) {
055                myStorageSettings = theStorageSettings;
056                myFulltextSearchSvc = theFulltextSearchSvc;
057        }
058
059        public boolean isSupportsHSearchDirect(
060                        String theResourceType, SearchParameterMap theParams, RequestDetails theRequestDetails) {
061                return myFulltextSearchSvc != null
062                                && myStorageSettings.isStoreResourceInHSearchIndex()
063                                && myStorageSettings.isAdvancedHSearchIndexing()
064                                && myFulltextSearchSvc.supportsAllOf(theParams)
065                                && theParams.getSummaryMode() == null
066                                && theParams.getSearchTotalMode() == null;
067        }
068
069        public ISearchStrategy makeDirectStrategy(
070                        String theSearchUUID,
071                        String theResourceType,
072                        SearchParameterMap theParams,
073                        RequestDetails theRequestDetails) {
074                return () -> {
075                        if (myFulltextSearchSvc == null) {
076                                return new SimpleBundleProvider(Collections.emptyList(), theSearchUUID);
077                        }
078
079                        List<IBaseResource> resources =
080                                        myFulltextSearchSvc.searchForResources(theResourceType, theParams, theRequestDetails);
081                        SimpleBundleProvider result = new SimpleBundleProvider(resources, theSearchUUID);
082                        result.setSize(resources.size());
083                        return result;
084                };
085        }
086}