/**
  * Enrich all meta data records with the (blob) content from repository.
  *
  * @param cr ContentRelation
  * @throws WebserverSystemException Thrown if access to repository (Feodra) failed.
  */
 private static void enrichWithMetadataContent(final ContentRelationCreate cr) {
   final List<MdRecordCreate> mdRecords = cr.getMetadataRecords();
   if (mdRecords != null) {
     for (final MdRecordCreate mdRecord : mdRecords) {
       if (mdRecord.getContent() == null) {
         final Datastream ds =
             new Datastream(
                 mdRecord.getName(),
                 cr.getObjid(),
                 cr.getProperties().getVersionDate(),
                 mdRecord.getMimeType(),
                 mdRecord.getDatastreamLocation(),
                 mdRecord.getControlGroup());
         mdRecord.setContent(new String(ds.getStream(), Charset.forName("UTF-8")));
       }
     }
   }
 }
  /**
   * Retrieve the properties of the last version (RELS-EXT) and inject values into
   * ContentRelationCreate object.
   *
   * @param cr ContentRelation object
   * @throws SystemException Thrown in case of internal failure.
   * @throws ContentRelationNotFoundException Thrown if resource with provided id could not be found
   *     in Fedora repository.
   */
  private static void setRelsExtValues(final ContentRelationCreate cr)
      throws SystemException, ContentRelationNotFoundException {

    // retrieve resource with id from Fedora
    final Datastream relsExt;
    try {
      relsExt = new Datastream(Datastream.RELS_EXT_DATASTREAM, cr.getObjid(), null);
    } catch (final StreamNotFoundException e) {
      throw new ContentRelationNotFoundException(
          "Content Relation with id '" + cr.getObjid() + "' could not be found.", e);
    }

    final StaxParser sp = new StaxParser();

    final RelsExtReadHandler eve = new RelsExtReadHandler(sp);
    eve.cleanIdentifier(true);
    sp.addHandler(eve);
    try {
      sp.parse(relsExt.getStream());
    } catch (final Exception e) {
      throw new WebserverSystemException(e);
    }

    final List<Triple> triples = eve.getElementValues().getTriples();

    // write triple values into ContentRelation object

    for (final Triple triple : triples) {
      if (triple.getPredicate().equals(TripleStoreUtility.PROP_FRAMEWORK_BUILD)) {
        cr.setBuildNumber(triple.getObject());
      }
      // creator --------------
      else if (triple.getPredicate().equals(TripleStoreUtility.PROP_CREATED_BY_ID)) {
        cr.getProperties().setCreatedById(triple.getObject());
      } else if (triple.getPredicate().equals(TripleStoreUtility.PROP_CREATED_BY_TITLE)) {
        cr.getProperties().setCreatedByName(triple.getObject());
      }
      // modifier --------------
      else if (triple.getPredicate().equals(TripleStoreUtility.PROP_MODIFIED_BY_ID)) {
        cr.getProperties().setModifiedById(triple.getObject());
      } else if (triple.getPredicate().equals(TripleStoreUtility.PROP_MODIFIED_BY_TITLE)) {
        cr.getProperties().setModifiedByName(triple.getObject());
      }
      // public-status --------------
      else if (triple.getPredicate().equals(TripleStoreUtility.PROP_PUBLIC_STATUS)) {

        final StatusType st;
        try {
          st = StatusType.getStatusType(triple.getObject());
        } catch (final InvalidStatusException e) {
          // shouldn't happen
          throw new SystemException(e);
        }
        cr.getProperties().setStatus(st);
      } else if (triple.getPredicate().equals(TripleStoreUtility.PROP_PUBLIC_STATUS_COMMENT)) {
        cr.getProperties().setStatusComment(triple.getObject());
      } else if (triple.getPredicate().equals(TripleStoreUtility.PROP_OBJECT_TYPE)) {
        // this is not the ContentRelation type, this is the type of
        // resource
        if (!(Constants.CONTENT_RELATION2_OBJECT_TYPE.equals(triple.getObject())
            || (Constants.RDF_NAMESPACE_URI + "Statement").equals(triple.getObject()))) {
          throw new WebserverSystemException("Resource is not from type ContentRelation.");
        }
      } else if (triple.getPredicate().equals(TripleStoreUtility.PROP_CONTENT_RELATION_SUBJECT)) {
        cr.setSubject(triple.getObject());
      } else if (triple.getPredicate().equals(TripleStoreUtility.PROP_CONTENT_RELATION_OBJECT)) {
        cr.setObject(triple.getObject());
      } else if (triple
          .getPredicate()
          .equals(TripleStoreUtility.PROP_CONTENT_RELATION_DESCRIPTION)) {
        cr.getProperties().setDescription(triple.getObject());
      } else if (triple.getPredicate().equals(TripleStoreUtility.PROP_CONTENT_RELATION_TYPE)) {
        try {
          cr.setType(new URI(triple.getObject()));
        } catch (final URISyntaxException e) {
          // shouldn't happen
          throw new SystemException("Stored value for URI in invalid.", e);
        }
      } else if (triple
          .getPredicate()
          .equals(TripleStoreUtility.PROP_CONTENT_RELATION_OBJECT_VERSION)) {
        cr.setObjectVersion(triple.getObject());
      } else {
        // add values for mapping
        LOGGER.warn("Predicate not mapped " + triple.getPredicate() + " = " + triple.getObject());
      }
    }
  }