001package org.hl7.fhir.r4.terminologies;
002
003/*
004  Copyright (c) 2011+, HL7, Inc.
005  All rights reserved.
006  
007  Redistribution and use in source and binary forms, with or without modification, 
008  are permitted provided that the following conditions are met:
009    
010   * Redistributions of source code must retain the above copyright notice, this 
011     list of conditions and the following disclaimer.
012   * Redistributions in binary form must reproduce the above copyright notice, 
013     this list of conditions and the following disclaimer in the documentation 
014     and/or other materials provided with the distribution.
015   * Neither the name of HL7 nor the names of its contributors may be used to 
016     endorse or promote products derived from this software without specific 
017     prior written permission.
018  
019  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND 
020  ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 
021  WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 
022  IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, 
023  INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 
024  NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR 
025  PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 
026  WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 
027  ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 
028  POSSIBILITY OF SUCH DAMAGE.
029  
030 */
031
032import org.hl7.fhir.exceptions.FHIRException;
033import org.hl7.fhir.r4.context.SimpleWorkerContext;
034import org.hl7.fhir.r4.model.Coding;
035import org.hl7.fhir.r4.model.ConceptMap;
036import org.hl7.fhir.r4.model.ConceptMap.ConceptMapGroupComponent;
037import org.hl7.fhir.r4.model.ConceptMap.SourceElementComponent;
038import org.hl7.fhir.r4.model.ConceptMap.TargetElementComponent;
039import org.hl7.fhir.r4.model.Enumerations.ConceptMapEquivalence;
040
041public class ConceptMapEngine {
042
043  private SimpleWorkerContext context;
044
045  public ConceptMapEngine(SimpleWorkerContext context) {
046    this.context = context;
047  }
048
049  public Coding translate(Coding source, String url) throws FHIRException {
050    ConceptMap cm = context.fetchResource(ConceptMap.class, url);
051    if (cm == null)
052      throw new FHIRException("Unable to find ConceptMap '" + url + "'");
053    if (source.hasSystem())
054      return translateBySystem(cm, source.getSystem(), source.getCode());
055    else
056      return translateByJustCode(cm, source.getCode());
057  }
058
059  private Coding translateByJustCode(ConceptMap cm, String code) throws FHIRException {
060    SourceElementComponent ct = null;
061    ConceptMapGroupComponent cg = null;
062    for (ConceptMapGroupComponent g : cm.getGroup()) {
063      for (SourceElementComponent e : g.getElement()) {
064        if (code.equals(e.getCode())) {
065          if (ct != null)
066            throw new FHIRException("Unable to process translate " + code
067                + " because multiple candidate matches were found in concept map " + cm.getUrl());
068          ct = e;
069          cg = g;
070        }
071      }
072    }
073    if (ct == null)
074      return null;
075    TargetElementComponent tt = null;
076    for (TargetElementComponent t : ct.getTarget()) {
077      if (!t.hasDependsOn() && !t.hasProduct() && isOkEquivalence(t.getEquivalence())) {
078        if (tt != null)
079          throw new FHIRException("Unable to process translate " + code
080              + " because multiple targets were found in concept map " + cm.getUrl());
081        tt = t;
082      }
083    }
084    if (tt == null)
085      return null;
086    return new Coding().setSystem(cg.getTarget()).setVersion(cg.getTargetVersion()).setCode(tt.getCode())
087        .setDisplay(tt.getDisplay());
088  }
089
090  private boolean isOkEquivalence(ConceptMapEquivalence equivalence) {
091    return equivalence != null && equivalence != ConceptMapEquivalence.DISJOINT
092        && equivalence != ConceptMapEquivalence.UNMATCHED;
093  }
094
095  private Coding translateBySystem(ConceptMap cm, String system, String code) {
096    throw new Error("Not done yet");
097  }
098
099}