initial commit

python_apps/media-monitor2/media/monitor/events.py

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+import os
+import mutagen
+import abc
+
+# Note: this isn't really good design...
+# Anyone who expects a BaseEvent object should be able to handle any instances
+# of its subclasses by the substitution principle. CLearly not the case with
+# the DeleteFile subclass.
+
+# It would be good if we could parameterize this class by the attribute
+# that would contain the path to obtain the meta data. But it would be too much
+# work for little reward
+class HasMetaData(object):
+    __metaclass__ = abc.ABCMeta
+    def __init__(self, *args, **kwargs):
+        self.__metadata = None
+        self.__loaded = False
+    @property
+    def metadata(self):
+        if self.__loaded: return self.__metadata
+        else:
+            f  = mutagen.File(self.path, easy=True)
+            self.__metadata = f
+            self.__loaded = True
+            return self.metadata
+
+class BaseEvent(object):
+    __metaclass__ = abc.ABCMeta
+    def __init__(self, raw_event):
+        self.__raw_event = raw_event
+        self.path = os.path.normpath(raw_event.pathname)
+        super(BaseEvent, self).__init__()
+    def exists(self): return os.path.exists(self.path)
+    def __str__(self):
+        return "Event. Path: %s" % self.__raw_event.pathname
+
+class OrganizeFile(BaseEvent, HasMetaData): pass
+class NewFile(BaseEvent, HasMetaData): pass
+class DeleteFile(BaseEvent): pass
+