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  • Committer: Robert Collins
  • Date: 2005-10-02 21:51:29 UTC
  • mfrom: (1396)
  • mto: This revision was merged to the branch mainline in revision 1397.
  • Revision ID: robertc@robertcollins.net-20051002215128-5686c7d24bf9bdb9
merge from martins newformat branch - brings in transport abstraction

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bzrlib/xml.py
 
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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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"""XML externalization support."""
 
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# "XML is like violence: if it doesn't solve your problem, you aren't
 
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# using enough of it." -- various
 
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# importing this module is fairly slow because it has to load several
 
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# ElementTree bits
 
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from bzrlib.trace import mutter, warning
 
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try:
 
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    from cElementTree import (ElementTree, SubElement, Element,
 
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                              XMLTreeBuilder, fromstring, tostring)
 
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except ImportError:
 
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    ## from warnings import warn
 
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    ## warn('using slower ElementTree; consider installing cElementTree')
 
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    from util.elementtree.ElementTree import (ElementTree, SubElement,
 
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                                              Element, XMLTreeBuilder,
 
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                                              fromstring, tostring)
 
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from bzrlib.inventory import ROOT_ID, Inventory, InventoryEntry
 
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from bzrlib.errors import BzrError
 
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class Serializer(object):
 
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    """Abstract object serialize/deserialize"""
 
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    def write_inventory(self, inv, f):
 
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        """Write inventory to a file"""
 
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        elt = self._pack_inventory(inv)
 
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        self._write_element(elt, f)
 
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    def write_inventory_to_string(self, inv):
 
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        return tostring(self._pack_inventory(inv))
 
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    def read_inventory_from_string(self, xml_string):
 
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        return self._unpack_inventory(fromstring(xml_string))
 
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    def read_inventory(self, f):
 
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        return self._unpack_inventory(self._read_element(f))
 
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    def write_revision(self, rev, f):
 
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        self._write_element(self._pack_revision(rev), f)
 
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    def write_revision_to_string(self, rev):
 
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        return tostring(self._pack_revision(rev), f)
 
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    def read_revision(self, f):
 
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        return self._unpack_revision(self._read_element(f))
 
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    def read_revision_from_string(self, xml_string):
 
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        return self._unpack_revision(fromstring(xml_string))
 
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    def _write_element(self, elt, f):
 
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        ElementTree(elt).write(f, 'utf-8')
 
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        f.write('\n')
 
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    def _read_element(self, f):
 
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        return ElementTree().parse(f)