[TASK] Make ProjectManager work properly.

service/Citavi.py

@@ -13,14 +13,13 @@ class Project():
         self._is_open = False
         self._is_error = False
         self._sa = {} # Object namespace for sqlalchemy related objects
-        
+
     def __del__(self):
         """ Destructor to close the citavi file. """
         self.close()
 
     def is_valid(self):
         """ This method returns False in case the given sqlite file is not a valid Citavi project. """
-        self.open()
         return self._is_open and not self._is_error
 
     def get_persons(self):
@@ -32,7 +31,19 @@ class Project():
         except:
             self._is_error = True
             # TODO: better error handling!
-            print "An error occured within a get_person call!"
+            print "An error occured within a get_persons call!"
+            return False
+
+    def get_person_by_uuid(self, uuid):
+        """ Returns a person from the Citavi project by their uuid. """
+        try:
+            person_class = self._sa_sqlite_autobase.classes.Person
+            citavi_person = self._sa_sqlite_session.query(person_class).filter('ID=\'' + str(uuid) + '\'').all()
+            return citavi_person[0]
+        except:
+            self._is_error = True
+            # TODO: better error handling!
+            print "An error occured within a get_person_by_uuid call!"
             return False
 
     def open(self):
@@ -73,24 +84,35 @@ class Project():
             self._is_open = True
 
 
+class ProjectManager():
+    """ A backend to provide fast access to Citavi identity data. """
 
-    pass
-
-
-class Mapper():
-    """ A class encapsulating the django models for mapping against Citavi projects. """
     def __init__(self):
-        pass
-    
+        """ Constructor initializing dictionary for instances of Project. """
+        self._projects = {}
+
     def __del__(self):
-        pass
-    
-    
+        """ Destructor making sure all Project instances are properly deconstructed. """
+        self._projects.clear()
 
+    def get_path_for_project_id(self, project_id):
+        return 'media/citavi/project_' + str(project_id) + '.ctt4'
 
+    def _add_project(self, project_id):
+        """ Internal method to add a Project instance if not existing. """
+        if project_id not in self._projects:
+            self._projects[project_id] = Project(self.get_path_for_project_id(project_id))
+            self._projects[project_id].open()
+
+    def get_person_by_uuid(self, project_id, uuid):
+        self._add_project(project_id)
+        return self._projects[project_id].get_person_by_uuid(uuid)
+
+    def get_persons_from_project(self, project_id):
+        self._add_project(project_id)
+        return self._projects[project_id].get_persons()
 
 """
-
 def import_sqlite(project_id, sqlite_file):
     print "This is import_sqlite speaking!"
     print project_id