refactor: introduce AbstractResource base class for resource interface

- Create AbstractResource class defining common resource interface
- Update Resource class to inherit from AbstractResource
- Refactor ImportedResource to implement AbstractResource interface
- Remove __getattr__ delegation in favor of explicit method implementations
- Improve code architecture and type safety for resource management

Author: phantomii

genesis_core/elements/dm/models.py

@@ -14,6 +14,7 @@
 #    License for the specific language governing permissions and limitations
 #    under the License.
 
+import abc
 from functools import partial
 import logging
 import enum
@@ -506,7 +507,62 @@ class Requirement(
     )
 
 
+class AbstractResource(metaclass=abc.ABCMeta):
+
+    @abc.abstractmethod
+    def get_uri(self):
+        raise NotImplementedError("Not implemented")
+
+    @abc.abstractmethod
+    def to_str(self, field: str) -> str:
+        raise NotImplementedError("Not implemented")
+
+    @abc.abstractmethod
+    def get_parameter_value(self, parameter):
+        raise NotImplementedError("Not implemented")
+
+    @abc.abstractmethod
+    def get_actual_state_safe(self):
+        raise NotImplementedError("Not implemented")
+
+    @abc.abstractmethod
+    def render_target_state(self, engine=None):
+        raise NotImplementedError("Not implemented")
+
+    @property
+    @abc.abstractmethod
+    def link(self):
+        raise NotImplementedError("Not implemented")
+
+    @abc.abstractmethod
+    def get_provider_element(self):
+        raise NotImplementedError("Not implemented")
+
+    @property
+    @abc.abstractmethod
+    def kind(self):
+        raise NotImplementedError("Not implemented")
+
+    @abc.abstractmethod
+    def calculate_full_hash(self):
+        raise NotImplementedError("Not implemented")
+
+    @abc.abstractmethod
+    def actualize(self):
+        raise NotImplementedError("Not implemented")
+
+    @abc.abstractmethod
+    def delete(self, session=None):
+        raise NotImplementedError("Not implemented")
+
+    @property
+    @abc.abstractmethod
+    def original(self):
+        raise NotImplementedError("Not implemented")
+
+
 class Resource(
+    AbstractResource,
     models.ModelWithUUID,
     models.ModelWithTimestamp,
     models.CustomPropertiesMixin,
@@ -891,16 +947,14 @@ def link(self):
         return f"{self.element.link}.imports.${self.name}"
 
 
-class ImportedResource:
+class ImportedResource(AbstractResource):
+
     def __init__(self, element, resource, name):
         super().__init__()
         self._element = element
         self._resource = resource
         self._name = name
 
-    def __getattr__(self, name):
-        return getattr(self._resource, name)
-
     def get_parameter_value(self, parameter):
         return type(self._resource).get_parameter_value(self, parameter)
 
@@ -916,6 +970,38 @@ def name(self):
     def link(self):
         return f"{self.element.link}.imports.${self.name}"
 
+    def get_uri(self):
+        return self._resource.get_uri()
+
+    def to_str(self, field: str) -> str:
+        return self._resource.to_str(field)
+
+    def get_actual_state_safe(self):
+        return self._resource.get_actual_state_safe()
+
+    def render_target_state(self, engine=None):
+        return self._resource.render_target_state(engine)
+
+    def get_provider_element(self):
+        return self._resource.get_provider_element()
+
+    @property
+    def kind(self):
+        return self._resource.kind
+
+    def calculate_full_hash(self):
+        return self._resource.calculate_full_hash()
+
+    def actualize(self):
+        return self._resource.actualize()
+
+    def delete(self, session=None):
+        return self._resource.delete(session)
+
+    @property
+    def original(self):
+        return self._resource
+
 
 class OutdatedResources(models.ModelWithUUID, orm.SQLStorableMixin):
     __tablename__ = "em_outdated_resources_view"