code: @Override
      public WritableBlobContainerContract createBlobWriter(LocatorInfo locator) {
          if (locator.getLocatorType() != LocatorType.SAS) {
              throw new IllegalArgumentException("Can only write to SAS locators");
          }
  
          LocatorParser p = new LocatorParser(locator);
  
          return new MediaBlobContainerWriter(createUploaderClient(),
                  p.getAccountName(), p.getStorageUri(), p.getContainer(),
                  p.getSASToken());
      }
docs: /*
  (non-Javadoc)
  
  @see
  com.microsoft.windowsazure.services.media.MediaContract#createBlobWriter
  (com.microsoft.windowsazure.services.media.models.LocatorInfo)