001/*-
002 * #%L
003 * HAPI FHIR - Core Library
004 * %%
005 * Copyright (C) 2014 - 2024 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.util.adapters;
021
022import java.util.Optional;
023
024public class AdapterUtils {
025
026        /**
027         * Main entry point for adapter calls.
028         * Implements three conversions: cast to the target type, use IAdaptable if present, or lastly try the AdapterManager.INSTANCE.
029         * @param theObject the object to be adapted
030         * @param theTargetType the type of the adapter requested
031         */
032        static <T> Optional<T> adapt(Object theObject, Class<T> theTargetType) {
033                if (theTargetType.isInstance(theObject)) {
034                        //noinspection unchecked
035                        return Optional.of((T) theObject);
036                }
037
038                if (theObject instanceof IAdaptable) {
039                        IAdaptable adaptable = (IAdaptable) theObject;
040                        var adapted = adaptable.getAdapter(theTargetType);
041                        if (adapted.isPresent()) {
042                                return adapted;
043                        }
044                }
045
046                return AdapterManager.INSTANCE.getAdapter(theObject, theTargetType);
047        }
048}