"""SCons.Sig

The Signature package for the scons software construction utility.

"""

#
# Copyright (c) 2001, 2002, 2003, 2004, 2005, 2006, 2007 The SCons Foundation
#
# Permission is hereby granted, free of charge, to any person obtaining
# a copy of this software and associated documentation files (the
# "Software"), to deal in the Software without restriction, including
# without limitation the rights to use, copy, modify, merge, publish,
# distribute, sublicense, and/or sell copies of the Software, and to
# permit persons to whom the Software is furnished to do so, subject to
# the following conditions:
#
# The above copyright notice and this permission notice shall be included
# in all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY
# KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE
# WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
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__revision__ = "/home/scons/scons/branch.0/baseline/src/engine/SCons/Sig/__init__.py 0.97.D001 2007/05/17 11:35:19 knight"

try:
    import MD5
    default_module = MD5
except ImportError:
    import TimeStamp
    default_module = TimeStamp

class Calculator:
    """
    Encapsulates signature calculations and .sconsign file generating
    for the build engine.
    """

    def __init__(self, module=default_module):
        """
        Initialize the calculator.

        module - the signature module to use for signature calculations
        """
        self.module = module

default_calc = Calculator()