#!/usr/bin/python2.5

#

# Copyright 2008 the Melange authors.

#

# Licensed under the Apache License, Version 2.0 (the "License");

# you may not use this file except in compliance with the License.

# You may obtain a copy of the License at

#

#   http://www.apache.org/licenses/LICENSE-2.0

#

# Unless required by applicable law or agreed to in writing, software

# distributed under the License is distributed on an "AS IS" BASIS,

# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

# See the License for the specific language governing permissions and

# limitations under the License.

"""Document (Model) query functions.

"""

__authors__ = [

  '"Sverre Rabbelier" <sverre@rabbelier.nl>',

  ]

from soc.cache import sidebar

from soc.cache import home

from soc.logic.models import work

from soc.logic.models import linkable as linkable_logic

import soc.models.document

import soc.models.work

class Logic(work.Logic):

  """Logic methods for the Document model

  """

  def __init__(self, model=soc.models.document.Document,

               base_model=soc.models.work.Work, scope_logic=linkable_logic):

    """Defines the name, key_name and model for this entity.

    """

    super(Logic, self).__init__(model=model, base_model=base_model,

                                scope_logic=scope_logic)

  def getKeyValuesFromEntity(self, entity):

    """See base.Logic.getKeyNameValues.

    """

    return [entity.prefix, entity.scope_path, entity.link_id]

  def getKeyValuesFromFields(self, fields):

    """See base.Logic.getKeyValuesFromFields.

    """

    return [fields['prefix'], fields['scope_path'], fields['link_id']]

  def getKeyFieldNames(self):

    """See base.Logic.getKeyFieldNames.

    """

    return ['prefix', 'scope_path', 'link_id']

  def isDeletable(self, entity):

    """See base.Logic.isDeletable.

    """

    return not entity.home_for

  def _updateField(self, entity, entity_properties, name):

    """Special logic for Document.

    - Flush the sidebar when a document is featured.

    - Remove the document from the homepage cache when the home_for is updated

    """

    value = entity_properties[name]

    if (name == 'is_featured') and (entity.is_featured != value):

      sidebar.flush()

    home_for = entity.home_for

    if (name != 'home_for') and home_for:

      home.flush(home_for)

    return True

logic = Logic()