root/cpsskins/branches/paris-sprint-2006/clientstorage.py

##############################################################################
#
# Copyright (c) 2005-2006 Nuxeo and Contributors.
# All Rights Reserved.
#
# This software is subject to the provisions of the Zope Public License,
# Version 2.1 (ZPL).  A copy of the ZPL should accompany this distribution.
# THIS SOFTWARE IS PROVIDED "AS IS" AND ANY AND ALL EXPRESS OR IMPLIED
# WARRANTIES ARE DISCLAIMED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
# WARRANTIES OF TITLE, MERCHANTABILITY, AGAINST INFRINGEMENT, AND FITNESS
# FOR A PARTICULAR PURPOSE.
#
##############################################################################
"""

$Id$
"""
__docformat__ = "reStructuredText"

from urllib import quote, unquote

from cpsskins import minjson as json

class ClientStorage(object):
    """A client-side storage (the information is stored in cookies)
    """
    def __init__(self, id, request):
        self.storage_id = u'cpsskins_local_storage_%s' % id
        self.request = request
        if self.data is None:
            self.data = {}

    def getData(self):
        """Get data from a local storage.
        """
        value = self.request.cookies.get(self.storage_id)
        if value is not None:
            return json.read(unquote(value))
        return None

    def setData(self, data):
        """Set data in the local storage.
        """
        value = quote(json.write(data))
        self.request.response.setCookie(self.storage_id, value, path='/')

    def __setitem__(self, k, v):
        data = self.data
        data[k] = v
        self.data = data

    def __getitem__(self, k):
        data = self.data
        if data is None:
            return None
        return data.get(k)

    def keys(self):
        data = self.data
        if data is None:
            return []
        return data.keys()

    data = property(getData, setData)