photofloat/TreeWalker.py

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import os
import os.path
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from datetime import datetime
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from PhotoAlbum import Photo, Album, json_cache, set_cache_path_base
class TreeWalker:
def __init__(self, album_path, cache_path):
self.album_path = album_path
self.cache_path = cache_path
set_cache_path_base(self.album_path)
self.all_albums = list()
self.all_photos = list()
self.walk(album_path)
self.remove_stale()
def walk(self, path):
cache = os.path.join(self.cache_path, json_cache(path))
cached = False
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cached_album = None
if os.path.exists(cache):
cached_album = Album.from_cache(cache)
if os.path.getmtime(path) <= os.path.getmtime(cache):
cached = True
album = cached_album
if not cached:
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album = Album(path)
for entry in os.listdir(path):
entry = os.path.join(path, entry)
if os.path.isdir(entry):
album.add_album(self.walk(entry))
elif not cached and os.path.isfile(entry):
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cache_hit = False
if cached_album:
cached_photo = cached_album.photo_from_path(entry)
if cached_photo and datetime.fromtimestamp(os.path.getmtime(entry)) <= cached_photo.attributes["DateTimeFile"]:
cache_hit = True
photo = cached_photo
if not cache_hit:
photo = Photo(entry, self.cache_path)
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if photo.is_valid:
self.all_photos.append(photo)
album.add_photo(photo)
album.cache(self.cache_path)
self.all_albums.append(album)
return album
def remove_stale(self):
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pass #TODO: remove left over caches