001package ca.uhn.fhir.mdm.rules.similarity;
002
003/*-
004 * #%L
005 * HAPI FHIR - Master Data Management
006 * %%
007 * Copyright (C) 2014 - 2022 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 ca.uhn.fhir.context.FhirContext;
024import ca.uhn.fhir.mdm.rules.matcher.BaseHapiStringMetric;
025import info.debatty.java.stringsimilarity.interfaces.NormalizedStringSimilarity;
026import org.hl7.fhir.instance.model.api.IBase;
027import org.hl7.fhir.instance.model.api.IPrimitiveType;
028
029/**
030 * Similarity measure for two IBase fields whose similarity can be measured by their String representations.
031 */
032public class HapiStringSimilarity extends BaseHapiStringMetric implements IMdmFieldSimilarity {
033        private final NormalizedStringSimilarity myStringSimilarity;
034
035        public HapiStringSimilarity(NormalizedStringSimilarity theStringSimilarity) {
036                myStringSimilarity = theStringSimilarity;
037        }
038
039        @Override
040        public double similarity(FhirContext theFhirContext, IBase theLeftBase, IBase theRightBase, boolean theExact) {
041                if (theLeftBase instanceof IPrimitiveType && theRightBase instanceof IPrimitiveType) {
042                        String leftString = extractString((IPrimitiveType<?>) theLeftBase, theExact);
043                        String rightString = extractString((IPrimitiveType<?>) theRightBase, theExact);
044
045                        return myStringSimilarity.similarity(leftString, rightString);
046                }
047                return 0.0;
048        }
049}