001/*-
002 * #%L
003 * HAPI FHIR - Core Library
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.util;
021
022import org.hl7.fhir.instance.model.api.IPrimitiveType;
023
024import java.lang.reflect.Field;
025import java.util.function.BiPredicate;
026
027/**
028 * Boolean-value function for comparing two FHIR primitives via <code>.equals()</code> method on the instance
029 * internal values.
030 */
031public class PrimitiveTypeEqualsPredicate implements BiPredicate {
032
033        /**
034         * Returns true if both bases are of the same type and hold the same values.
035         */
036        @Override
037        public boolean test(Object theBase1, Object theBase2) {
038                if (theBase1 == null) {
039                        return theBase2 == null;
040                }
041                if (theBase2 == null) {
042                        return false;
043                }
044                if (!theBase1.getClass().equals(theBase2.getClass())) {
045                        return false;
046                }
047
048                for (Field f : theBase1.getClass().getDeclaredFields()) {
049                        Class<?> fieldClass = f.getType();
050
051                        if (!IPrimitiveType.class.isAssignableFrom(fieldClass)) {
052                                continue;
053                        }
054
055                        IPrimitiveType<?> val1, val2;
056
057                        f.setAccessible(true);
058                        try {
059                                val1 = (IPrimitiveType<?>) f.get(theBase1);
060                                val2 = (IPrimitiveType<?>) f.get(theBase2);
061                        } catch (Exception e) {
062                                // swallow
063                                continue;
064                        }
065
066                        if (val1 == null && val2 == null) {
067                                continue;
068                        }
069
070                        if (val1 == null || val2 == null) {
071                                return false;
072                        }
073
074                        Object actualVal1 = val1.getValue();
075                        Object actualVal2 = val2.getValue();
076
077                        if (actualVal1 == null && actualVal2 == null) {
078                                continue;
079                        }
080                        if (actualVal1 == null) {
081                                return false;
082                        }
083                        if (!actualVal1.equals(actualVal2)) {
084                                return false;
085                        }
086                }
087
088                return true;
089        }
090}