code: @Override
      public String getUri() {
          String escapedEntityId;
          try {
              escapedEntityId = URLEncoder.encode(primaryEntityId, "UTF-8");
          } catch (UnsupportedEncodingException e) {
              throw new InvalidParameterException(
                      "UTF-8 encoding is not supported.");
          }
          return String.format("%s('%s')/$links/%s", primaryEntitySet,
                  escapedEntityId, secondaryEntitySet);
      }
docs: /*
  (non-Javadoc)
  
  @see
  com.microsoft.windowsazure.services.media.entities.EntityDeleteOperation
  #getUri()