code: public int getSolverLength() {
      // Attribute name alias, creation date, Id length,
      int length = 4 + 8 + 4;
  
      // Id,
      if (this.identifier != null) {
        try {
          length += this.identifier.getBytes("UTF-16BE").length;
        } catch (UnsupportedEncodingException e) {
          throw new RuntimeException("Unable to encode UTF16 strings.", e);
        }
      }
  
      // Data length
      length += 4;
      // Data
      if (this.data != null) {
        length += this.data.length;
      }
  
      return length;
    }
docs: Returns the length of this attribute, in bytes, as encoded according to the
  Solver-World Model protocol.
  
  @return the length of the encoded form of this attribute object