~bzr-pqm/bzr/bzr.dev

1 by mbp at sourcefrog
import from baz patch-364
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#! /usr/bin/env python
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# -*- coding: UTF-8 -*-
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 2 of the License, or
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# (at your option) any later version.
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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# GNU General Public License for more details.
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write to the Free Software
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# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
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from xml import XMLMixin
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from ElementTree import Element, ElementTree, SubElement
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class Revision(XMLMixin):
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    """Single revision on a branch.
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    Revisions may know their revision_hash, but only once they've been
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    written out.  This is not stored because you cannot write the hash
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    into the file it describes.
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    :todo: Perhaps make predecessor be a child element, not an attribute?
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    """
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    def __init__(self, **args):
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        self.inventory_id = None
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        self.revision_id = None
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        self.timestamp = None
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        self.message = None
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        self.__dict__.update(args)
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    def __repr__(self):
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        if self.revision_id:
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            return "<Revision id %s>" % self.revision_id
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    def to_element(self):
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        root = Element('changeset',
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                       committer = self.committer,
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                       timestamp = '%f' % self.timestamp,
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                       revision_id = self.revision_id,
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                       inventory_id = self.inventory_id)
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        if self.precursor:
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            root.set('precursor', self.precursor)
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        root.text = '\n'
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        msg = SubElement(root, 'message')
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        msg.text = self.message
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        msg.tail = '\n'
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        return root
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    def from_element(cls, root):
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        cs = cls(committer = root.get('committer'),
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                 timestamp = float(root.get('timestamp')),
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                 precursor = root.get('precursor'),
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                 revision_id = root.get('revision_id'),
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                 inventory_id = root.get('inventory_id'))
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        cs.message = root.findtext('message') # text of <message>
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        return cs
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    from_element = classmethod(from_element)
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