@Override
    public EOperation define(EcoreEnvironment env) {
      EOperation eOperation = EcoreFactory.eINSTANCE.createEOperation();
      eOperation.setName(fName);
      int pos = 0;
      for (EClassifier cls : fParamTypes) {
        EParameter eParam = EcoreFactory.eINSTANCE.createEParameter();
        String paramName = cls.getName();
        if (fParamNames != null) {
          paramName = fParamNames[pos++];
        }

        eParam.setName(paramName);
        eParam.setEType(cls);
        eOperation.getEParameters().add(eParam);
      }

      eOperation.setEType(fReturnType);

      assert fContextType instanceof EClass;
      ((EClass) fContextType).getEOperations().add(eOperation);

      CallHandlerAdapter.attach(eOperation, fDispatcher);
      return eOperation;
    }