@Override
  public void process(JCas jCas) throws AnalysisEngineProcessException {
    try {
      String apfUri = jCas.getView(Ace2005Constants.ACE_2005_APF_URI_VIEW).getSofaDataURI();
      JCas initialView = jCas.getView(CAS.NAME_DEFAULT_SOFA);
      String documentText = initialView.getDocumentText();
      SAXBuilder builder = new SAXBuilder();
      builder.setDTDHandler(null);
      URI sofaDataURI = new URI(apfUri);
      Document doc = builder.build(new File(sofaDataURI));

      Element apfSource = doc.getRootElement();
      Element apfDocument = apfSource.getChild("document");
      for (Element apfEntity : apfDocument.getChildren("entity")) {
        NamedEntity namedEntity = new NamedEntity(initialView);
        namedEntity.setEntityType(apfEntity.getAttributeValue("TYPE"));
        namedEntity.setEntitySubtype(apfEntity.getAttributeValue("SUBTYPE"));
        namedEntity.setEntityClass(apfEntity.getAttributeValue("CLASS"));
        namedEntity.setEntityId(apfEntity.getAttributeValue("ID"));
        namedEntity.addToIndexes();

        List<NamedEntityMention> mentions = new ArrayList<NamedEntityMention>();

        for (Element entityMention : apfEntity.getChildren("entity_mention")) {
          int start =
              Integer.parseInt(
                  entityMention.getChild("extent").getChild("charseq").getAttributeValue("START"));
          int end =
              Integer.parseInt(
                  entityMention.getChild("extent").getChild("charseq").getAttributeValue("END"));
          String givenText = entityMention.getChild("extent").getChild("charseq").getText();
          String parsedText = documentText.substring(start, end + 1);
          Matcher ampMatcher = ampPattern.matcher(parsedText);
          parsedText = ampMatcher.replaceAll("&");

          NamedEntityMention mention = new NamedEntityMention(initialView, start, end + 1);
          mention.setMentionId(entityMention.getAttributeValue("ID"));
          mention.setMentionType(entityMention.getAttributeValue("TYPE"));
          mention.setMentionedEntity(namedEntity);

          Chunk chunk = new Chunk(initialView, start, end + 1);
          mention.setAnnotation(chunk);

          int headStart =
              Integer.parseInt(
                  entityMention.getChild("head").getChild("charseq").getAttributeValue("START"));
          int headEnd =
              Integer.parseInt(
                  entityMention.getChild("head").getChild("charseq").getAttributeValue("END"));
          Chunk head = new Chunk(initialView, headStart, headEnd + 1);
          mention.setHead(head);

          mention.addToIndexes();
          mentions.add(mention);

          givenText = givenText.replaceAll("\\s+", " ");
          parsedText = givenText.replaceAll("\\s+", " ");

          // if(!givenText.equals(parsedText))
          // {
          //
          // System.out.println("given text and parsed text differ.");
          // System.out.println(givenText);
          // System.out.println(parsedText);
          // System.out.println(apfDocument.getAttributeValue("DOCID"));
          // System.out.println(apfEntity.getAttributeValue("ID"));
          // System.out.println(documentText);
          // }
        }
        namedEntity.setMentions(new FSArray(jCas, mentions.size()));
        FSCollectionFactory.fillArrayFS(namedEntity.getMentions(), mentions);
      }

    } catch (CASException ce) {
      throw new AnalysisEngineProcessException(ce);
    } catch (IOException ioe) {
      throw new AnalysisEngineProcessException(ioe);
    } catch (JDOMException je) {
      throw new AnalysisEngineProcessException(je);
    } catch (URISyntaxException use) {
      throw new AnalysisEngineProcessException(use);
    }
  }
  @Override
  public void process(JCas jCas) throws AnalysisEngineProcessException {
    Annotation document = this.processor.process(jCas.getDocumentText());

    String lastNETag = "O";
    int lastNEBegin = -1;
    int lastNEEnd = -1;
    for (CoreMap tokenAnn : document.get(TokensAnnotation.class)) {

      // create the token annotation
      int begin = tokenAnn.get(CharacterOffsetBeginAnnotation.class);
      int end = tokenAnn.get(CharacterOffsetEndAnnotation.class);
      String pos = tokenAnn.get(PartOfSpeechAnnotation.class);
      String lemma = tokenAnn.get(LemmaAnnotation.class);
      Token token = new Token(jCas, begin, end);
      token.setPos(pos);
      token.setLemma(lemma);
      token.addToIndexes();

      // hackery to convert token-level named entity tag into phrase-level tag
      String neTag = tokenAnn.get(NamedEntityTagAnnotation.class);
      if (neTag.equals("O") && !lastNETag.equals("O")) {
        NamedEntityMention ne = new NamedEntityMention(jCas, lastNEBegin, lastNEEnd);
        ne.setMentionType(lastNETag);
        ne.addToIndexes();
      } else {
        if (lastNETag.equals("O")) {
          lastNEBegin = begin;
        } else if (lastNETag.equals(neTag)) {
          // do nothing - begin was already set
        } else {
          NamedEntityMention ne = new NamedEntityMention(jCas, lastNEBegin, lastNEEnd);
          ne.setMentionType(lastNETag);
          ne.addToIndexes();
          lastNEBegin = begin;
        }
        lastNEEnd = end;
      }
      lastNETag = neTag;
    }
    if (!lastNETag.equals("O")) {
      NamedEntityMention ne = new NamedEntityMention(jCas, lastNEBegin, lastNEEnd);
      ne.setMentionType(lastNETag);
      ne.addToIndexes();
    }

    // add sentences and trees
    for (CoreMap sentenceAnn : document.get(SentencesAnnotation.class)) {

      // add the sentence annotation
      int sentBegin = sentenceAnn.get(CharacterOffsetBeginAnnotation.class);
      int sentEnd = sentenceAnn.get(CharacterOffsetEndAnnotation.class);
      Sentence sentence = new Sentence(jCas, sentBegin, sentEnd);
      sentence.addToIndexes();

      // add the syntactic tree annotation
      List<CoreLabel> tokenAnns = sentenceAnn.get(TokensAnnotation.class);
      Tree tree = sentenceAnn.get(TreeAnnotation.class);
      if (tree.children().length != 1) {
        throw new RuntimeException("Expected single root node, found " + tree);
      }
      tree = tree.firstChild();
      tree.indexSpans(0);
      TopTreebankNode root = new TopTreebankNode(jCas);
      root.setTreebankParse(tree.toString());
      // TODO: root.setTerminals(v)
      this.addTreebankNodeToIndexes(root, jCas, tree, tokenAnns);

      // get the dependencies
      SemanticGraph dependencies =
          sentenceAnn.get(CollapsedCCProcessedDependenciesAnnotation.class);

      // convert Stanford nodes to UIMA annotations
      List<Token> tokens = JCasUtil.selectCovered(jCas, Token.class, sentence);
      Map<IndexedWord, DependencyNode> stanfordToUima = new HashMap<IndexedWord, DependencyNode>();
      for (IndexedWord stanfordNode : dependencies.vertexSet()) {
        int indexBegin = stanfordNode.get(BeginIndexAnnotation.class);
        int indexEnd = stanfordNode.get(EndIndexAnnotation.class);
        int tokenBegin = tokens.get(indexBegin).getBegin();
        int tokenEnd = tokens.get(indexEnd - 1).getEnd();
        DependencyNode node;
        if (dependencies.getRoots().contains(stanfordNode)) {
          node = new TopDependencyNode(jCas, tokenBegin, tokenEnd);
        } else {
          node = new DependencyNode(jCas, tokenBegin, tokenEnd);
        }
        stanfordToUima.put(stanfordNode, node);
      }

      // create relation annotations for each Stanford dependency
      ArrayListMultimap<DependencyNode, DependencyRelation> headRelations =
          ArrayListMultimap.create();
      ArrayListMultimap<DependencyNode, DependencyRelation> childRelations =
          ArrayListMultimap.create();
      for (SemanticGraphEdge stanfordEdge : dependencies.edgeIterable()) {
        DependencyRelation relation = new DependencyRelation(jCas);
        DependencyNode head = stanfordToUima.get(stanfordEdge.getGovernor());
        DependencyNode child = stanfordToUima.get(stanfordEdge.getDependent());
        String relationType = stanfordEdge.getRelation().toString();
        if (head == null || child == null || relationType == null) {
          throw new RuntimeException(
              String.format(
                  "null elements not allowed in relation:\nrelation=%s\nchild=%s\nhead=%s\n",
                  relation, child, head));
        }
        relation.setHead(head);
        relation.setChild(child);
        relation.setRelation(relationType);
        relation.addToIndexes();
        headRelations.put(child, relation);
        childRelations.put(head, relation);
      }

      // set the relations for each node annotation
      for (DependencyNode node : stanfordToUima.values()) {
        List<DependencyRelation> heads = headRelations.get(node);
        node.setHeadRelations(new FSArray(jCas, heads == null ? 0 : heads.size()));
        if (heads != null) {
          FSCollectionFactory.fillArrayFS(node.getHeadRelations(), heads);
        }
        List<DependencyRelation> children = childRelations.get(node);
        node.setChildRelations(new FSArray(jCas, children == null ? 0 : children.size()));
        if (children != null) {
          FSCollectionFactory.fillArrayFS(node.getChildRelations(), children);
        }
        node.addToIndexes();
      }
    }

    // map from spans to named entity mentions
    Map<Span, NamedEntityMention> spanMentionMap = new HashMap<Span, NamedEntityMention>();
    for (NamedEntityMention mention : JCasUtil.select(jCas, NamedEntityMention.class)) {
      spanMentionMap.put(new Span(mention.getBegin(), mention.getEnd()), mention);
    }

    // add mentions for all entities identified by the coreference system
    List<NamedEntity> entities = new ArrayList<NamedEntity>();
    List<List<Token>> sentenceTokens = new ArrayList<List<Token>>();
    for (Sentence sentence : JCasUtil.select(jCas, Sentence.class)) {
      sentenceTokens.add(JCasUtil.selectCovered(jCas, Token.class, sentence));
    }
    Map<Integer, CorefChain> corefChains = document.get(CorefChainAnnotation.class);
    for (CorefChain chain : corefChains.values()) {
      List<NamedEntityMention> mentions = new ArrayList<NamedEntityMention>();
      for (CorefMention corefMention : chain.getMentionsInTextualOrder()) {

        // figure out the character span of the token
        List<Token> tokens = sentenceTokens.get(corefMention.sentNum - 1);
        int begin = tokens.get(corefMention.startIndex - 1).getBegin();
        int end = tokens.get(corefMention.endIndex - 2).getEnd();

        // use an existing named entity mention when possible; otherwise create a new one
        NamedEntityMention mention = spanMentionMap.get(new Span(begin, end));
        if (mention == null) {
          mention = new NamedEntityMention(jCas, begin, end);
          mention.addToIndexes();
        }
        mentions.add(mention);
      }

      // create an entity for the mentions
      Collections.sort(
          mentions,
          new Comparator<NamedEntityMention>() {
            @Override
            public int compare(NamedEntityMention m1, NamedEntityMention m2) {
              return m1.getBegin() - m2.getBegin();
            }
          });

      // create mentions and add them to entity
      NamedEntity entity = new NamedEntity(jCas);
      entity.setMentions(new FSArray(jCas, mentions.size()));
      int index = 0;
      for (NamedEntityMention mention : mentions) {
        mention.setMentionedEntity(entity);
        entity.setMentions(index, mention);
        index += 1;
      }
      entities.add(entity);
    }

    // add singleton entities for any named entities not picked up by coreference system
    for (NamedEntityMention mention : JCasUtil.select(jCas, NamedEntityMention.class)) {
      if (mention.getMentionedEntity() == null) {
        NamedEntity entity = new NamedEntity(jCas);
        entity.setMentions(new FSArray(jCas, 1));
        entity.setMentions(0, mention);
        mention.setMentionedEntity(entity);
        entity.getMentions();
        entities.add(entity);
      }
    }

    // sort entities by document order
    Collections.sort(
        entities,
        new Comparator<NamedEntity>() {
          @Override
          public int compare(NamedEntity o1, NamedEntity o2) {
            return getFirstBegin(o1) - getFirstBegin(o2);
          }

          private int getFirstBegin(NamedEntity entity) {
            int min = Integer.MAX_VALUE;
            for (NamedEntityMention mention :
                JCasUtil.select(entity.getMentions(), NamedEntityMention.class)) {
              if (mention.getBegin() < min) {
                min = mention.getBegin();
              }
            }
            return min;
          }
        });

    // add entities to document
    for (NamedEntity entity : entities) {
      entity.addToIndexes();
    }
  }