#!/usr/bin/python

#

# CDDL HEADER START

#

# The contents of this file are subject to the terms of the

# Common Development and Distribution License (the "License").

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

#

# You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE

# or http://www.opensolaris.org/os/licensing.

# See the License for the specific language governing permissions

# and limitations under the License.

#

# When distributing Covered Code, include this CDDL HEADER in each

# file and include the License file at usr/src/OPENSOLARIS.LICENSE.

# If applicable, add the following below this CDDL HEADER, with the

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# Copyright 2009 Sun Microsystems, Inc.  All rights reserved.

# Use is subject to license terms.

class DebugValues(dict):

        """Singleton dict that returns None if unknown value

        is referenced"""

        __metaclass__ = Singleton

        def __getitem__(self, item):

                """ returns None if not set """

                return self.get(item, None)

        def get_value(self, key):

                return self[key]

        def set_value(self, key, value):

                self[key] = value

DebugValues=DebugValues()