+ /// \return True if the attribute is valid. It checks whether the selection
+ /// is acceptable for operation.
+ /// \param[in] theAttribute an attribute to check.
+ /// \param[in] theArguments a filter parameters.
+ /// \param[out] theError error message.
+ virtual bool isValid(const AttributePtr& theAttribute,
+ const std::list<std::string>& theArguments,
+ Events_InfoMessage& theError) const;
+};
+
+/// \class FeaturesPlugin_ValidatorRemoveSubShapesResult
+/// \ingroup Validators
+/// \brief Validator for the Remove Sub-Shapes feature.
+class FeaturesPlugin_ValidatorRemoveSubShapesResult: public ModelAPI_FeatureValidator
+{
+ public:
+ //! \return true if result is valid shape.
+ //! \param theFeature the checked feature
+ //! \param theArguments arguments of the feature (not used)
+ //! \param theError error message
+ virtual bool isValid(const std::shared_ptr<ModelAPI_Feature>& theFeature,
+ const std::list<std::string>& theArguments,
+ Events_InfoMessage& theError) const;
+
+ /// \return true if the attribute in feature is not obligatory for the feature execution
+ virtual bool isNotObligatory(std::string theFeature, std::string theAttribute);
+};
+
+/// \class FeaturesPlugin_ValidatorUnionSelection
+/// \ingroup Validators
+/// \brief Validates selection for "Union" feature.
+class FeaturesPlugin_ValidatorUnionSelection: public ModelAPI_AttributeValidator
+{
+public:
+ /// \return True if the attribute is valid. It checks whether the selection
+ /// is acceptable for operation.
+ /// \param[in] theAttribute an attribute to check.
+ /// \param[in] theArguments a filter parameters.
+ /// \param[out] theError error message.
+ virtual bool isValid(const AttributePtr& theAttribute,
+ const std::list<std::string>& theArguments,
+ Events_InfoMessage& theError) const;
+};
+
+/// \class FeaturesPlugin_ValidatorUnionArguments
+/// \ingroup Validators
+/// \brief Validator for the "Union" feature.
+class FeaturesPlugin_ValidatorUnionArguments: public ModelAPI_FeatureValidator
+{
+ public:
+ //! \return true if result is valid shape.
+ //! \param theFeature the checked feature
+ //! \param theArguments arguments of the feature (not used)
+ //! \param theError error message
+ virtual bool isValid(const std::shared_ptr<ModelAPI_Feature>& theFeature,
+ const std::list<std::string>& theArguments,
+ Events_InfoMessage& theError) const;
+
+ /// \return true if the attribute in feature is not obligatory for the feature execution
+ virtual bool isNotObligatory(std::string theFeature, std::string theAttribute);
+};
+
+/// \class FeaturesPlugin_ValidatorConcealedResult
+/// \ingroup Validators
+/// \brief Validator for the "Recover" feature.
+class FeaturesPlugin_ValidatorConcealedResult: public ModelAPI_AttributeValidator
+{
+ public:
+ //! \return True if the attribute is valid.