001package ca.uhn.fhir.mdm.rules.matcher;
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.util.CanonicalIdentifier;
025import ca.uhn.fhir.mdm.util.IdentifierUtil;
026import ca.uhn.fhir.model.primitive.StringDt;
027import org.hl7.fhir.instance.model.api.IBase;
028
029public class IdentifierMatcher implements IMdmFieldMatcher {
030        /**
031         * @return true if the two fhir identifiers are the same.  If @param theIdentifierSystem is not null, then the
032         * matcher only returns true if the identifier systems also match this system.
033         * @throws UnsupportedOperationException if either Base is not an Identifier instance
034         */
035        @Override
036        public boolean matches(FhirContext theFhirContext, IBase theLeftBase, IBase theRightBase, boolean theExact, String theIdentifierSystem) {
037                CanonicalIdentifier left = IdentifierUtil.identifierDtFromIdentifier(theLeftBase);
038                if (theIdentifierSystem != null) {
039                        if (!theIdentifierSystem.equals(left.getSystemElement().getValueAsString())) {
040                                return false;
041                        }
042                }
043                CanonicalIdentifier right = IdentifierUtil.identifierDtFromIdentifier(theRightBase);
044                if (isEmpty(left.getValueElement()) || isEmpty(right.getValueElement())) {
045                        return false;
046                }
047                return left.equals(right);
048        }
049
050        private boolean isEmpty(StringDt theValue) {
051                if (theValue == null) {
052                        return true;
053                }
054                return theValue.isEmpty();
055        }
056}