code: public void setEngineName(String name) {
          if (HTTL_DEFAULT.equals(name)) {
              name = "";
          } else {
              if (name.startsWith(HTTL_PREFIX)) {
                  name = name.substring(HTTL_PREFIX.length());
              }
              if (name.endsWith(PROPERTIES_SUFFIX)) {
                  name = name.substring(0, name.length() - PROPERTIES_SUFFIX.length());
              }
          }
          this.engineName = name;
      }
docs: httl.properties: engine.name=httl.properties