Source code for zope.size

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#
# Copyright (c) 2002 Zope Foundation and Contributors.
# All Rights Reserved.
#
# This software is subject to the provisions of the Zope Public License,
# Version 2.1 (ZPL).  A copy of the ZPL should accompany this distribution.
# THIS SOFTWARE IS PROVIDED "AS IS" AND ANY AND ALL EXPRESS OR IMPLIED
# WARRANTIES ARE DISCLAIMED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
# WARRANTIES OF TITLE, MERCHANTABILITY, AGAINST INFRINGEMENT, AND FITNESS
# FOR A PARTICULAR PURPOSE.
#
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"""Adapters that give the size of an object.
"""
from zope.interface import implementer
from zope.size.interfaces import ISized
from zope.i18nmessageid import MessageFactory
_ = MessageFactory('zope')

[docs]@implementer(ISized) class DefaultSized(object): """ A default :class:`zope.size.interfaces.ISized` adapter producing bytes for any object that has a ``getSize`` method and (None, None) for all other objects. """ def __init__(self, obj): try: size = int(obj.getSize()) except (AttributeError, ValueError, TypeError): self._sortingSize = None, None else: self._sortingSize = 'byte', size
[docs] def sizeForSorting(self): """See ISized""" return self._sortingSize
[docs] def sizeForDisplay(self): """See ISized""" units, size = self._sortingSize if units == 'byte': return byteDisplay(size) return _('not-available', 'n/a')
[docs]def byteDisplay(size): """ Returns a size with the correct unit (KB, MB), given the size in bytes. The output should be given to zope.i18n.translate() """ if size == 0: return _('0 KB') if size <= 1024: return _('1 KB') if size > 1048576: return _('${size} MB', mapping={'size': '%0.02f' % (size / 1048576.0)}) return _('${size} KB', mapping={'size': '%d' % (size / 1024.0)})