60 lines
2.5 KiB
Python
60 lines
2.5 KiB
Python
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# Copyright (c) 2004-2006 The Regents of The University of Michigan
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# All rights reserved.
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#
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# Redistribution and use in source and binary forms, with or without
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# modification, are permitted provided that the following conditions are
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# met: redistributions of source code must retain the above copyright
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# notice, this list of conditions and the following disclaimer;
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# redistributions in binary form must reproduce the above copyright
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# notice, this list of conditions and the following disclaimer in the
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# documentation and/or other materials provided with the distribution;
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# neither the name of the copyright holders nor the names of its
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# contributors may be used to endorse or promote products derived from
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# this software without specific prior written permission.
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#
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# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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#
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# Authors: Steve Reinhardt
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# Nathan Binkert
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#############################
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#
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# Utility classes & methods
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#
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#############################
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class Singleton(type):
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def __call__(cls, *args, **kwargs):
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if hasattr(cls, '_instance'):
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return cls._instance
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cls._instance = super(Singleton, cls).__call__(*args, **kwargs)
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return cls._instance
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# Apply method to object.
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# applyMethod(obj, 'meth', <args>) is equivalent to obj.meth(<args>)
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def applyMethod(obj, meth, *args, **kwargs):
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return getattr(obj, meth)(*args, **kwargs)
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# If the first argument is an (non-sequence) object, apply the named
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# method with the given arguments. If the first argument is a
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# sequence, apply the method to each element of the sequence (a la
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# 'map').
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def applyOrMap(objOrSeq, meth, *args, **kwargs):
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if not isinstance(objOrSeq, (list, tuple)):
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return applyMethod(objOrSeq, meth, *args, **kwargs)
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else:
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return [applyMethod(o, meth, *args, **kwargs) for o in objOrSeq]
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