bb5fc7cb7c
This does patch updates Gramps to the 3.2 syntax, it does not yet mean Gramps works with python 3.2 Expect next day commits to fix further issues, but this is the main 2to3 tool created patch changed where needed to have python 2.7 work. Specific issues might be: 1. next has been changed, must be checked 2. new division as on the wiki page listed is to do 3. ... svn: r20634
126 lines
3.8 KiB
Python
126 lines
3.8 KiB
Python
#
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# Gramps - a GTK+/GNOME based genealogy program
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#
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# Copyright (C) 2000-2006 Donald N. Allingham
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# Copyright (C) 2011 Tim G L Lyons
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 2 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write to the Free Software
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# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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#
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# $Id$
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#
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"""
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Provide the database state class
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"""
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from .db import DbBsddbRead
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from .proxy.proxybase import ProxyDbBase
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from .utils.callback import Callback
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from .config import config
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class DbState(Callback):
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"""
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Provide a class to encapsulate the state of the database.
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"""
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__signals__ = {
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'database-changed' : ((DbBsddbRead, ProxyDbBase), ),
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'no-database' : None,
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}
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def __init__(self):
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"""
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Initalize the state with an empty (and useless) DbBsddbRead. This is
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just a place holder until a real DB is assigned.
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"""
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Callback.__init__(self)
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self.db = DbBsddbRead()
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self.open = False
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self.stack = []
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def change_database(self, database):
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"""
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Closes the existing db, and opens a new one.
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Retained for backward compatibility.
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"""
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self.emit('no-database', ())
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self.db.close()
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self.change_database_noclose(database)
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def change_database_noclose(self, database):
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"""
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Change the current database. and resets the configuration prefixes.
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"""
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self.db = database
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self.db.set_prefixes(
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config.get('preferences.iprefix'),
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config.get('preferences.oprefix'),
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config.get('preferences.fprefix'),
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config.get('preferences.sprefix'),
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config.get('preferences.cprefix'),
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config.get('preferences.pprefix'),
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config.get('preferences.eprefix'),
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config.get('preferences.rprefix'),
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config.get('preferences.nprefix') )
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self.open = True
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self.signal_change()
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def signal_change(self):
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"""
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Emits the database-changed signal with the new database
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"""
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self.emit('database-changed', (self.db, ))
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def no_database(self):
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"""
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Closes the database without a new database
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"""
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self.emit('no-database', ())
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self.db.close()
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self.db = DbBsddbRead()
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self.db.db_is_open = False
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self.open = False
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self.emit('database-changed', (self.db, ))
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def get_database(self):
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"""
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Get a reference to the current database.
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"""
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return self.db
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def apply_proxy(self, proxy, *args, **kwargs):
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"""
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Add a proxy to the current database. Use pop_proxy() to
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revert to previous db.
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>>> dbstate.apply_proxy(gen.proxy.LivingProxyDb, 1)
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>>> dbstate.apply_proxy(gen.proxy.PrivateProxyDb)
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"""
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self.stack.append(self.db)
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self.db = proxy(self.db, *args, **kwargs)
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self.emit('database-changed', (self.db, ))
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def pop_proxy(self):
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"""
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Remove the previously applied proxy.
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>>> dbstate.apply_proxy(gen.proxy.LivingProxyDb, 1)
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>>> dbstate.pop_proxy()
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>>> dbstate.apply_proxy(gen.proxy.PrivateProxyDb)
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>>> dbstate.pop_proxy()
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"""
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self.db = self.stack.pop()
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self.emit('database-changed', (self.db, ))
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