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Viewing changes to bzrlib/btree_index.py

  • Committer: Andrew Bennetts
  • Date: 2008-10-27 06:14:45 UTC
  • mfrom: (3793 +trunk)
  • mto: This revision was merged to the branch mainline in revision 3795.
  • Revision ID: andrew.bennetts@canonical.com-20081027061445-eqt9lz6uw1mbvq4g
Merge from bzr.dev.

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bzrlib/btree_index.py
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from bisect import bisect_right
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from copy import deepcopy
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import math
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import sha
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import struct
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import tempfile
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import zlib
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        self._nodes = {}
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        # Indicate it hasn't been built yet
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        self._nodes_by_key = None
 
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        self._optimize_for_size = False
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    def add_node(self, key, value, references=()):
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        """Add a node to the index.
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                    length = _PAGE_SIZE
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                    if internal_row.nodes == 0:
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                        length -= _RESERVED_HEADER_BYTES # padded
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                    internal_row.writer = chunk_writer.ChunkWriter(length, 0)
 
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                    internal_row.writer = chunk_writer.ChunkWriter(length, 0,
 
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                        optimize_for_size=self._optimize_for_size)
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                    internal_row.writer.write(_INTERNAL_FLAG)
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                    internal_row.writer.write(_INTERNAL_OFFSET +
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                        str(rows[pos + 1].nodes) + "\n")
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            length = _PAGE_SIZE
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            if rows[-1].nodes == 0:
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                length -= _RESERVED_HEADER_BYTES # padded
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            rows[-1].writer = chunk_writer.ChunkWriter(length)
 
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            rows[-1].writer = chunk_writer.ChunkWriter(length,
 
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                optimize_for_size=self._optimize_for_size)
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            rows[-1].writer.write(_LEAF_FLAG)
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        if rows[-1].writer.write(line):
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            # this key did not fit in the node:
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                # This will be padded, hence the -100
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                new_row.writer = chunk_writer.ChunkWriter(
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                    _PAGE_SIZE - _RESERVED_HEADER_BYTES,
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                    reserved_bytes)
 
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                    reserved_bytes,
 
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                    optimize_for_size=self._optimize_for_size)
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                new_row.writer.write(_INTERNAL_FLAG)
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                new_row.writer.write(_INTERNAL_OFFSET +
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                    str(rows[1].nodes - 1) + "\n")