public AppEngineFile getBlobFile(BlobKey blobKey) throws FileNotFoundException {
if (blobKey == null) {
throw new NullPointerException("blobKey is null");
}
Entity entity = getEntity(blobKey);
String creationHandle = (String) entity.getProperty(BLOB_INFO_CREATION_HANDLE_PROPERTY);
String namePart = (creationHandle == null ? blobKey.getKeyString() : creationHandle);
AppEngineFile file = new AppEngineFile(AppEngineFile.FileSystem.BLOBSTORE, namePart);
setCachedBlobKey(file, blobKey);
return file;
}
private String getBlobKey(Entity blobFileIndexEntity) {
return (String) blobFileIndexEntity.getProperty(BLOB_KEY_PROPERTY_NAME);
}