public BlobKey getBlobKey(AppEngineFile file) {
if (null == file) {
throw new NullPointerException("file is null");
}
if (file.getFileSystem() != AppEngineFile.FileSystem.BLOBSTORE) {
throw new IllegalArgumentException("file is not of type BLOBSTORE");
}
BlobKey cached = getCachedBlobKey(file);
if (null != cached) {
return cached;
}
String creationHandle = getCreationHandle(file);
if (creationHandle == null) {
return new BlobKey(file.getNamePart());
}
Entity blobInfoEntity = getBlobInfoEntity(creationHandle);
if (blobInfoEntity == null) {
return null;
}
BlobInfo blobInfo = new BlobInfoFactory().createBlobInfo(blobInfoEntity);
return blobInfo.getBlobKey();
}
public AppEngineFile createNewBlobFile(String mimeType, String uploadedFileName)
throws IOException {
if (mimeType == null || mimeType.trim().isEmpty()) {
mimeType = DEFAULT_MIME_TYPE;
}
Map<String, String> params = new TreeMap<String, String>();
params.put(PARAMETER_MIME_TYPE, mimeType);
if (uploadedFileName != null && !uploadedFileName.isEmpty()) {
params.put(PARAMETER_BLOB_INFO_UPLOADED_FILE_NAME, uploadedFileName);
}
String filePath =
createFilePath(
FILESYSTEM_BLOBSTORE, null, FileServicePb.FileContentType.ContentType.RAW, params);
AppEngineFile file = new AppEngineFile(filePath);
if (!file.getNamePart().startsWith(CREATION_HANDLE_PREFIX)) {
throw new RuntimeException("Expected creation handle: " + file.getFullPath());
}
return file;
}
private String getCreationHandle(AppEngineFile file) {
String namePart = file.getNamePart();
return (namePart.startsWith(CREATION_HANDLE_PREFIX) ? namePart : null);
}
public FileReadChannel openReadChannel(AppEngineFile file, boolean lock)
throws FileNotFoundException, LockException, IOException {
GridFilesystem gfs = getGridFilesystem();
return new JBossFileReadChannel(gfs.getInput(file.getFullPath())); // TODO lock?
}