001/*-
002 * #%L
003 * HAPI FHIR - Master Data Management
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.mdm.rules.similarity;
021
022import ca.uhn.fhir.context.FhirContext;
023import ca.uhn.fhir.mdm.rules.matcher.util.StringMatcherUtils;
024import info.debatty.java.stringsimilarity.interfaces.NormalizedStringSimilarity;
025import org.hl7.fhir.instance.model.api.IBase;
026import org.hl7.fhir.instance.model.api.IPrimitiveType;
027
028/**
029 * Similarity measure for two IBase fields whose similarity can be measured by their String representations.
030 */
031public class HapiStringSimilarity implements IMdmFieldSimilarity {
032        protected final NormalizedStringSimilarity myStringSimilarity;
033
034        public HapiStringSimilarity(NormalizedStringSimilarity theStringSimilarity) {
035                myStringSimilarity = theStringSimilarity;
036        }
037
038        @Override
039        public double similarity(FhirContext theFhirContext, IBase theLeftBase, IBase theRightBase, boolean theExact) {
040                if (theLeftBase instanceof IPrimitiveType && theRightBase instanceof IPrimitiveType) {
041                        String leftString = StringMatcherUtils.extractString((IPrimitiveType<?>) theLeftBase, theExact);
042                        String rightString = StringMatcherUtils.extractString((IPrimitiveType<?>) theRightBase, theExact);
043
044                        return myStringSimilarity.similarity(leftString, rightString);
045                }
046                return 0.0;
047        }
048}