code: private void addObjectIdentity(final Object object) {
  
          if (object == null) {
              _buffer.append("null");
          } else {
              _buffer.append(object.getClass().getName());
              _buffer.append("@");
              _buffer
                      .append(Integer
                              .toHexString(System.identityHashCode(object)));
          }
  
      }
docs: Adds a string identifying the given object to the buffer.
  
  @param object
  the object to add