##############################################################################
#
# Copyright (c) 2001 Zope Corporation and Contributors. All Rights Reserved.
#
# This software is subject to the provisions of the Zope Public License,
# Version 2.0 (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
#
##############################################################################
"""
Mounted database support

A MountedTemporaryFolder is an object that is a mount point.  It mounts a
TemporaryStorage-backed database and masquerades as its root object.
When you traverse one of these things, the __of__ method of the mount
point object is called, and that returns a Folder object that actually
lives in another ZODB.

To understand this fully, you'll need to read the source of
ZODB.Mount.MountPoint.

$Id: TemporaryFolder.py,v 1.8.2.4 2003/08/17 21:00:17 chrism Exp $
"""
__version__='$Revision: 1.8.2.4 $'[11:-2]

import os, os.path

import Globals
from Globals import HTMLFile
from ZODB.Mount import MountPoint
from OFS.Folder import Folder
from OFS.SimpleItem import Item

from ZODB.DB import DB
from tempstorage.TemporaryStorage import TemporaryStorage
from LowConflictConnection import LowConflictConnection

ADD_TEMPORARY_FOLDER_PERM="Add Temporary Folder"


def constructTemporaryFolder(self, id, title=None, REQUEST=None):
    """ """
    ms = MountedTemporaryFolder(id, title)
    self._setObject(id, ms)
    if REQUEST is not None:
        return self.manage_main(self, REQUEST, update_menu=1)


constructTemporaryFolderForm=HTMLFile('dtml/addTemporaryFolder', globals())

class SimpleTemporaryContainer(Folder):
    # dbtab-style container class
    meta_type = 'Temporary Folder'
    icon = 'misc_/TemporaryFolder/tempfolder.gif'

class MountedTemporaryFolder(MountPoint, Item):
    """
    A mounted RAM database with a basic interface for displaying the
    reason the database did not connect.

    XXX this is only here for backwards compatibility purposes:
    DBTab uses the SimpleTemporaryContainer class instead.
    """
    icon = 'p_/broken'
    manage_options = ({'label':'Traceback', 'action':'manage_traceback'},)
    meta_type = 'Broken Temporary Folder'

    def __init__(self, id, title='', params=None):
        self.id = str(id)
        self.title = title
        MountPoint.__init__(self, path='/') # Eep

    manage_traceback = Globals.DTMLFile('dtml/mountfail', globals())

    def _createDB(self, db=None): # huh?  db=db was original
        """ Create a mounted RAM database """
        db = DB(TemporaryStorage())
        # the connection in 2.5.X - 2.6.1 was a "low conflict connection",
        # but this caused synchronization problems.  For 2.6.2, we want
        # to reenable read conflict errors, so we use a default connection
        # type.
        #db.klass = LowConflictConnection
        return db

    def _getMountRoot(self, root):
        sdc = root.get('folder', None)
        if sdc is None:
            sdc = root['folder'] = Folder()
            self._populate(sdc, root)

        return sdc

    def mount_error_(self):
        return self._v_connect_error

    def _populate(self, folder, root):
        # Set up our folder object
        folder.id = self.id                     # be a chameleon
        folder.title = self.title
        folder.icon = "misc_/TemporaryFolder/tempfolder.gif"
        s=folder.manage_options[1:]
        folder.manage_options = (
            {'label':'Contents', 'action':'manage_main',
             'help':('TemporaryFolder','TemporaryFolder.stx')},
            )+s
