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bzrlib/xml_serializer.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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# "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 ElementTree bits
 
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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 util.cElementTree import ElementTree, SubElement, Element
 
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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 util.elementtree.ElementTree import ElementTree, SubElement, Element
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def pack_xml(o, f):
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    """Write object o to file f as XML.
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    o must provide a to_element method.
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    """
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    ElementTree(o.to_element()).write(f, 'utf-8')
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    f.write('\n')
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def unpack_xml(cls, f):
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    return cls.from_element(ElementTree().parse(f))
 
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    mutter('WARNING: using slower ElementTree; consider installing cElementTree'
 
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           " and make sure it's on your PYTHONPATH")
 
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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.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)) + '\n'
 
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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)) + '\n'
 
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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)