/usr/share/pyshared/larch/idpath.py is in python-larch 1.20131130-1.
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 | # Copyright 2011 Lars Wirzenius
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
import os
class IdPath(object):
'''Convert a numeric id to a pathname.
The ids are stored in a directory hierarchy, the depth of which
can be adjusted by a parameter to the class. The ids are assumed
to be non-negative integers.
'''
def __init__(self, dirname, depth, bits_per_level, skip_bits):
self.dirname = dirname
self.depth = depth
self.bits_per_level = bits_per_level
self.skip_bits = skip_bits
def convert(self, identifier):
def level_bits(level):
level_mask = 2**self.bits_per_level - 1
n = self.skip_bits + level * self.bits_per_level
return (identifier >> n) & level_mask
subdirs = ['%d' % level_bits(i) for i in range(self.depth)]
parts = [self.dirname] + subdirs + ['%x' % identifier]
return os.path.join(*parts)
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