001package ca.uhn.fhir.util;
002
003/*-
004 * #%L
005 * HAPI FHIR - Core Library
006 * %%
007 * Copyright (C) 2014 - 2021 Smile CDR, Inc.
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 org.hl7.fhir.instance.model.api.IPrimitiveType;
024
025import java.lang.reflect.Field;
026import java.util.function.BiPredicate;
027
028/**
029 * Boolean-value function for comparing two FHIR primitives via <code>.equals()</code> method on the instance
030 * internal values.
031 */
032public class PrimitiveTypeEqualsPredicate implements BiPredicate {
033
034        /**
035         * Returns true if both bases are of the same type and hold the same values.
036         */
037        @Override
038        public boolean test(Object theBase1, Object theBase2) {
039                if (theBase1 == null) {
040                        return theBase2 == null;
041                }
042                if (theBase2 == null) {
043                        return false;
044                }
045                if (!theBase1.getClass().equals(theBase2.getClass())) {
046                        return false;
047                }
048
049                for (Field f : theBase1.getClass().getDeclaredFields()) {
050                        Class<?> fieldClass = f.getType();
051
052                        if (!IPrimitiveType.class.isAssignableFrom(fieldClass)) {
053                                continue;
054                        }
055
056                        IPrimitiveType<?> val1, val2;
057
058                        f.setAccessible(true);
059                        try {
060                                val1 = (IPrimitiveType<?>) f.get(theBase1);
061                                val2 = (IPrimitiveType<?>) f.get(theBase2);
062                        } catch (Exception e) {
063                                // swallow
064                                continue;
065                        }
066
067                        if (val1 == null && val2 == null) {
068                                continue;
069                        }
070
071                        if (val1 == null || val2 == null) {
072                                return false;
073                        }
074
075                        Object actualVal1 = val1.getValue();
076                        Object actualVal2 = val2.getValue();
077
078                        if (actualVal1 == null && actualVal2 == null) {
079                                continue;
080                        }
081                        if (actualVal1 == null) {
082                                return false;
083                        }
084                        if (!actualVal1.equals(actualVal2)) {
085                                return false;
086                        }
087                }
088
089                return true;
090        }
091}