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