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Viewing changes to bzrlib/chk_serializer.py

  • Committer: Vincent Ladeuil
  • Date: 2012-03-13 17:25:29 UTC
  • mfrom: (6499 +trunk)
  • mto: This revision was merged to the branch mainline in revision 6501.
  • Revision ID: v.ladeuil+lp@free.fr-20120313172529-i0suyjnepsor25i7
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bzrlib/chk_serializer.py
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"""Serializer object for CHK based inventory storage."""
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from __future__ import absolute_import
 
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from cStringIO import StringIO
 
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from bzrlib import lazy_import
 
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lazy_import.lazy_import(globals(),
 
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"""
 
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from bzrlib import (
 
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    xml_serializer,
 
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    )
 
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""")
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from bzrlib import (
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    bencode,
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    cache_utf8,
 
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    errors,
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    revision as _mod_revision,
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    xml8,
 
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    serializer,
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    )
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        return self.read_revision_from_string(f.read())
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class CHKSerializer(xml8.Serializer_v8):
 
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class CHKSerializer(serializer.Serializer):
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    """A CHKInventory based serializer with 'plain' behaviour."""
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    format_num = '9'
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    revision_format_num = None
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    support_altered_by_hack = False
 
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    supported_kinds = set(['file', 'directory', 'symlink', 'tree-reference'])
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    def __init__(self, node_size, search_key_name):
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        self.maximum_size = node_size
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        self.search_key_name = search_key_name
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    def _unpack_inventory(self, elt, revision_id=None, entry_cache=None,
 
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                          return_from_cache=False):
 
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        """Construct from XML Element"""
 
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        inv = xml_serializer.unpack_inventory_flat(elt, self.format_num,
 
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            xml_serializer.unpack_inventory_entry, entry_cache,
 
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            return_from_cache)
 
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        return inv
 
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    def read_inventory_from_string(self, xml_string, revision_id=None,
 
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                                   entry_cache=None, return_from_cache=False):
 
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        """Read xml_string into an inventory object.
 
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        :param xml_string: The xml to read.
 
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        :param revision_id: If not-None, the expected revision id of the
 
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            inventory.
 
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        :param entry_cache: An optional cache of InventoryEntry objects. If
 
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            supplied we will look up entries via (file_id, revision_id) which
 
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            should map to a valid InventoryEntry (File/Directory/etc) object.
 
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        :param return_from_cache: Return entries directly from the cache,
 
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            rather than copying them first. This is only safe if the caller
 
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            promises not to mutate the returned inventory entries, but it can
 
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            make some operations significantly faster.
 
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        """
 
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        try:
 
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            return self._unpack_inventory(
 
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                xml_serializer.fromstring(xml_string), revision_id,
 
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                entry_cache=entry_cache,
 
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                return_from_cache=return_from_cache)
 
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        except xml_serializer.ParseError, e:
 
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            raise errors.UnexpectedInventoryFormat(e)
 
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    def read_inventory(self, f, revision_id=None):
 
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        """Read an inventory from a file-like object."""
 
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        try:
 
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            try:
 
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                return self._unpack_inventory(self._read_element(f),
 
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                    revision_id=None)
 
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            finally:
 
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                f.close()
 
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        except xml_serializer.ParseError, e:
 
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            raise errors.UnexpectedInventoryFormat(e)
 
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    def write_inventory_to_lines(self, inv):
 
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        """Return a list of lines with the encoded inventory."""
 
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        return self.write_inventory(inv, None)
 
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    def write_inventory_to_string(self, inv, working=False):
 
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        """Just call write_inventory with a StringIO and return the value.
 
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        :param working: If True skip history data - text_sha1, text_size,
 
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            reference_revision, symlink_target.
 
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        """
 
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        sio = StringIO()
 
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        self.write_inventory(inv, sio, working)
 
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        return sio.getvalue()
 
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    def write_inventory(self, inv, f, working=False):
 
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        """Write inventory to a file.
 
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        :param inv: the inventory to write.
 
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        :param f: the file to write. (May be None if the lines are the desired
 
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            output).
 
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        :param working: If True skip history data - text_sha1, text_size,
 
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            reference_revision, symlink_target.
 
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        :return: The inventory as a list of lines.
 
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        """
 
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        output = []
 
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        append = output.append
 
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        if inv.revision_id is not None:
 
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            revid1 = ' revision_id="'
 
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            revid2 = xml_serializer.encode_and_escape(inv.revision_id)
 
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        else:
 
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            revid1 = ""
 
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            revid2 = ""
 
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        append('<inventory format="%s"%s%s>\n' % (
 
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            self.format_num, revid1, revid2))
 
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        append('<directory file_id="%s name="%s revision="%s />\n' % (
 
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            xml_serializer.encode_and_escape(inv.root.file_id),
 
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            xml_serializer.encode_and_escape(inv.root.name),
 
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            xml_serializer.encode_and_escape(inv.root.revision)))
 
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        xml_serializer.serialize_inventory_flat(inv,
 
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            append,
 
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            root_id=None, supported_kinds=self.supported_kinds, 
 
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            working=working)
 
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        if f is not None:
 
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            f.writelines(output)
 
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        return output
 
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chk_serializer_255_bigpage = CHKSerializer(65536, 'hash-255-way')
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