/
picker.py
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/
picker.py
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# rndpic - an App Engine app to display random pictures from Picasa Web.
# Copyright (C) 2010 Patrick Moor <patrick@moor.ws>
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
import random
class RandomPicturePicker(object):
def __init__(self, album_repository):
self._album_repository = album_repository
def _PickWeighted(self, albums):
total_pictures = sum(album.GetCount() for album in albums)
if total_pictures > 0:
pick = random.randint(0, total_pictures - 1)
for album in albums:
pick -= album.GetCount()
if pick < 0:
return album
def _PickById(self, albums, album_id):
for album in albums:
if album.GetId() == album_id:
return album
def Pick(self, user_name, size, album_id=None):
albums = self._album_repository.GetAlbums(user_name)
if album_id:
album = self._PickById(albums, album_id)
else:
album = self._PickWeighted(albums)
if album:
pictures = self._album_repository.GetPictures(album, size)
if pictures:
return random.choice(pictures)