Refactored the converter backend system

2011-07-13 22:53:33 -04:00
parent 082c3e699c
commit 415f0c8daa
16 changed files with 317 additions and 238 deletions
@@ -0,0 +1,43 @@
+class ConverterBase(object):
+    """
+    Base class that all backend classes must inherit
+    """
+
+    def identify_file(self, input_filepath, *args, **kwargs):
+        raise NotImplementedError("Your %s class has not defined a identify_file() method, which is required." % self.__class__.__name__)
+
+    def identify_document(self, document, *args, **kwargs):
+        raise NotImplementedError("Your %s class has not defined a identify_document() method, which is required." % self.__class__.__name__)
+    
+    def convert_file(self, input_filepath, *args, **kwargs):
+        raise NotImplementedError("Your %s class has not defined a convert_file() method, which is required." % self.__class__.__name__)
+
+    def convert_document(self, document, *args, **kwargs):
+        raise NotImplementedError("Your %s class has not defined a convert_document() method, which is required." % self.__class__.__name__)
+
+    def get_format_list(self):
+        raise NotImplementedError("Your %s class has not defined a get_format_list() method, which is required." % self.__class__.__name__)
+
+    def get_available_transformations(self):
+        raise NotImplementedError("Your %s class has not defined a get_available_transformations() method, which is required." % self.__class__.__name__)
+
+    def get_available_transformations_labels(self):
+        return ([(name, data['label']) for name, data in self.get_available_transformations().items()])
+
+    def get_transformation_string(self, transformation_list):
+        transformations = []
+        warnings = []
+        transformation_choices = self.get_available_transformations()
+        for transformation in transformation_list:
+            try:
+                if transformation['transformation'] in transformation_choices:
+                    transformations.append(
+                        transformation_choices[transformation['transformation']]['command_line'] % eval(
+                            transformation['arguments']
+                        )
+                    )
+            except Exception, e:
+                warnings.append(e)
+
+        return u' '.join(transformations), warnings        
+