How to use

getUnique

method

in

eu.fbk.knowledgestore.data.Record

private Map<URI, Record> extractRelated(final Record record) throws Throwable {
  // TODO: this has to be done better using some Schema object
  final URI id = record.getID();
  final URI type = record.getSystemType();
  final Map<URI, Record> map = Maps.newHashMap();
  if (type.equals(KS.RESOURCE)) {
    for (final URI mentionID : record.get(KS.HAS_MENTION, URI.class)) {
      map.put(mentionID, Record.create(mentionID, KS.MENTION).add(KS.MENTION_OF, id));
    }
  } else if (type.equals(KS.MENTION)) {
    final URI resourceID = record.getUnique(KS.MENTION_OF, URI.class);
    if (resourceID != null) {
      map.put(resourceID, Record.create(resourceID, KS.RESOURCE).add(KS.HAS_MENTION, id));
    }
  } else {
    // TODO: handle entities, axioms and contexts
    throw new Error("Unexpected type: " + type);
  }
  return map;
}

final Record metadata = resource.getUnique(KS.STORED_AS, Record.class);
if (metadata == null) {
  return null;
final String fileName = metadata.getUnique(NFO.FILE_NAME, String.class);
check(fileName != null, null, resourceID, "No filename stored for resource (!)");
final String fileTypeString = metadata.getUnique(NIE.MIME_TYPE, String.class);
if (mimeTypes != null) {
  check(fileTypeString != null, Status.ERROR_NOT_ACCEPTABLE, resourceID,
      Data.mimeTypeToExtensions(transformToType), "bin");
  final String name = MoreObjects.firstNonNull(
      metadata.getUnique(NFO.FILE_NAME, String.class, null), "download")
      + "." + ext;
  stream = transform(fileTypeString, transformToType, stream);
  meta.set(NIE.MIME_TYPE, transformToType);
  meta.set(NFO.FILE_NAME, name);
  meta.set(NFO.FILE_LAST_MODIFIED, metadata.getUnique(NFO.FILE_LAST_MODIFIED));
  return representation;

final Record oldMetadata = resource.getUnique(KS.STORED_AS, Record.class);
  final Record metadata = representation.getMetadata();
  metadata.setID(Data.getValueFactory().createURI(resourceID + "_file"));
  fileName = metadata.getUnique(NFO.FILE_NAME, String.class);
  String fileType = metadata.getUnique(NIE.MIME_TYPE, String.class);
  if (fileType != null) {
    try {
  deleteFileQuietly(oldMetadata.getUnique(NFO.FILE_NAME, String.class));