/** Annotation remove event */
  public void annotationRemoved(AnnotationSetEvent ase) {
    if (!disableListener && ase.getSourceDocument() == this) {
      AnnotationSet as = (AnnotationSet) ase.getSource();
      Annotation annot = ase.getAnnotation();
      FeatureMap features = Factory.newFeatureMap();
      features.putAll(annot.getFeatures());

      boolean defaultAS = as.getName() == null;
      for (String docID : combinedDocumentIds) {
        Document aDoc = compoundDocument.getDocument(docID);

        // find out the details which refer to the deleted annotation
        OffsetDetails od = getOffsetDetails(docID, as.getName(), annot);
        if (od == null) continue;

        if (defaultAS) {
          aDoc.getAnnotations().remove(od.getOriginalAnnotation());
        } else {
          aDoc.getAnnotations(as.getName()).remove(od.getOriginalAnnotation());
        }
        removeOffsetDetails(docID, od);
        break;
      }
    }
  }
  /** Annotation added event */
  public void annotationAdded(AnnotationSetEvent ase) {

    if (!disableListener && ase.getSourceDocument() == this) {
      AnnotationSet as = (AnnotationSet) ase.getSource();
      Annotation annot = ase.getAnnotation();
      annot.addAnnotationListener(this);

      FeatureMap features = Factory.newFeatureMap();
      features.putAll(annot.getFeatures());

      boolean defaultAS = as.getName() == null;
      for (String docID : combinedDocumentIds) {
        Document aDoc = compoundDocument.getDocument(docID);
        long stOffset = getOffsetInSrcDocument(docID, annot.getStartNode().getOffset().longValue());
        if (stOffset == -1) continue;
        long enOffset = getOffsetInSrcDocument(docID, annot.getEndNode().getOffset().longValue());
        if (enOffset == -1) continue;
        Annotation originalAnnot = null;
        try {
          Integer id = annot.getId();
          if (defaultAS) {

            aDoc.getAnnotations()
                .add(id, new Long(stOffset), new Long(enOffset), annot.getType(), features);
            originalAnnot = aDoc.getAnnotations().get(id);
          } else {
            aDoc.getAnnotations(as.getName())
                .add(id, new Long(stOffset), new Long(enOffset), annot.getType(), features);
            originalAnnot = aDoc.getAnnotations(as.getName()).get(id);
          }
        } catch (InvalidOffsetException ioe) {
          System.out.println(aDoc.getName() + "=" + stOffset + "=" + enOffset);
          throw new GateRuntimeException(ioe);
        }

        OffsetDetails od = new OffsetDetails();
        od.setOldStartOffset(stOffset);
        od.setOldEndOffset(enOffset);
        od.setNewStartOffset(annot.getStartNode().getOffset().longValue());
        od.setNewEndOffset(annot.getEndNode().getOffset().longValue());
        od.setOriginalAnnotation(originalAnnot);
        od.setNewAnnotation(annot);
        addNewOffsetDetails(docID, od);
        break;
      }
    }
  }