Checker: Add abstract checker class.

src/Checker/Checker.py

+# -*- coding: utf-8 -*-
+
+from enum import Enum
+
+from Model.Except import NotImplementedMethodeError
+
+class STATUS(Enum):
+    UNKNOWN = -1
+    OK = 0
+    WARNING = 1
+    ERROR = 2
+
+class AbstractModelChecker(object):
+    def __init__(self):
+        self._name = ""
+        self._description = ""
+
+        self._status = STATUS.UNKNOWN
+        self._summary = "Unknown"
+
+    @property
+    def name(self):
+        return self._name
+
+    @property
+    def description(self):
+        return self._description
+
+    # Checker status
+
+    def is_unknown(self):
+        return self._status == STATUS.UNKNOWN
+
+    def is_ok(self):
+        return self._status == STATUS.OK
+
+    def is_warning(self):
+        return self._status == STATUS.WARNING
+
+    def is_error(self):
+        return self._status == STATUS.ERROR
+
+    # Abstract function
+
+    def run(self, study):
+        """Run checker function
+
+        Args:
+            study: The study to check
+
+        Returns:
+            Return true if study is valid for this checker, false
+            otherelse
+        """
+        raise NotImplementedMethodeError(self, self.run)
+
+    def summary(self):
+        """Return summary message
+
+        Returns:
+            Return summary string
+        """
+        raise NotImplementedMethodeError(self, self.summary)