001package org.hl7.fhir.r5.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
032
033
034import org.hl7.fhir.exceptions.FHIRException;
035import org.hl7.fhir.r5.context.SimpleWorkerContext;
036import org.hl7.fhir.r5.model.Coding;
037import org.hl7.fhir.r5.model.ConceptMap;
038import org.hl7.fhir.r5.model.ConceptMap.ConceptMapGroupComponent;
039import org.hl7.fhir.r5.model.ConceptMap.SourceElementComponent;
040import org.hl7.fhir.r5.model.ConceptMap.TargetElementComponent;
041import org.hl7.fhir.r5.model.Enumerations.ConceptMapRelationship;
042import org.hl7.fhir.utilities.CanonicalPair;
043import org.hl7.fhir.utilities.MarkedToMoveToAdjunctPackage;
044
045@MarkedToMoveToAdjunctPackage
046public class ConceptMapEngine {
047
048  private SimpleWorkerContext context;
049
050  public ConceptMapEngine(SimpleWorkerContext context) {
051    this.context = context;
052  }
053
054  public Coding translate(Coding source, String url) throws FHIRException {
055    ConceptMap cm = context.fetchResource(ConceptMap.class, url);
056    if (cm == null)
057      throw new FHIRException("Unable to find ConceptMap '"+url+"'");
058    if (source.hasSystem()) 
059      return translateBySystem(cm, source.getSystem(), source.getCode());
060    else
061      return translateByJustCode(cm, source.getCode());
062  }
063
064  private Coding translateByJustCode(ConceptMap cm, String code) throws FHIRException {
065    SourceElementComponent ct = null;
066    ConceptMapGroupComponent cg = null;
067    for (ConceptMapGroupComponent g : cm.getGroup()) {
068      for (SourceElementComponent e : g.getElement()) {
069        if (code.equals(e.getCode())) {
070          if (e != null)
071            throw new FHIRException("Unable to process translate "+code+" because multiple candidate matches were found in concept map "+cm.getUrl());
072          ct = e;
073          cg = g;
074        }
075      }
076    }
077    if (ct == null)
078      return null;
079    TargetElementComponent tt = null;
080    for (TargetElementComponent t : ct.getTarget()) {
081      if (!t.hasDependsOn() && !t.hasProduct() && isOkRelationship(t.getRelationship())) {
082        if (tt != null)
083          throw new FHIRException("Unable to process translate "+code+" because multiple targets were found in concept map "+cm.getUrl());
084        tt = t;       
085      }
086    }
087    if (tt == null)
088      return null;
089    CanonicalPair cp = new CanonicalPair(cg.getTarget());
090    return new Coding().setSystem(cp.getUrl()).setVersion(cp.getVersion()).setCode(tt.getCode()).setDisplay(tt.getDisplay());      
091  }
092
093  private boolean isOkRelationship(ConceptMapRelationship relationship) {
094    return relationship != null && relationship != ConceptMapRelationship.NOTRELATEDTO;
095  }
096
097  private Coding translateBySystem(ConceptMap cm, String system, String code) {
098    throw new Error("Not done yet");
099  }
100
101}