85 lines
3.1 KiB
Python
85 lines
3.1 KiB
Python
# Copyright 2012 Matt Chaput. 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 met:
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#
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# 1. Redistributions of source code must retain the above copyright notice,
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# this list of conditions and the following disclaimer.
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#
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# 2. 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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#
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# THIS SOFTWARE IS PROVIDED BY MATT CHAPUT ``AS IS'' AND ANY EXPRESS OR
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# IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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# MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
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# EVENT SHALL MATT CHAPUT OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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# INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA,
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# OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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# LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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# NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
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# EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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#
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# The views and conclusions contained in the software and documentation are
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# those of the authors and should not be interpreted as representing official
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# policies, either expressed or implied, of Matt Chaput.
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import pickle
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class RenamingUnpickler(pickle.Unpickler):
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"""Subclasses ``pickle.Unpickler`` to allow remapping of class names before
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loading them.
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"""
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def __init__(self, f, objmap, shortcuts=None):
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pickle.Unpickler.__init__(self, f)
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if shortcuts:
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objmap = dict((k % shortcuts, v % shortcuts)
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for k, v in objmap.items())
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self._objmap = objmap
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def find_class(self, modulename, objname):
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fqname = "%s.%s" % (modulename, objname)
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if fqname in self._objmap:
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fqname = self._objmap[fqname]
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try:
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obj = find_object(fqname)
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except ImportError:
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raise ImportError("Couldn't find %r" % fqname)
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return obj
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def find_object(name, blacklist=None, whitelist=None):
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"""Imports and returns an object given a fully qualified name.
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>>> find_object("whoosh.analysis.StopFilter")
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<class 'whoosh.analysis.StopFilter'>
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"""
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if blacklist:
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for pre in blacklist:
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if name.startswith(pre):
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raise TypeError("%r: can't instantiate names starting with %r"
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% (name, pre))
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if whitelist:
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passes = False
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for pre in whitelist:
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if name.startswith(pre):
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passes = True
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break
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if not passes:
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raise TypeError("Can't instantiate %r" % name)
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lastdot = name.rfind(".")
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assert lastdot > -1, "Name %r must be fully qualified" % name
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modname = name[:lastdot]
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clsname = name[lastdot + 1:]
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mod = __import__(modname, fromlist=[clsname])
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cls = getattr(mod, clsname)
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return cls
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