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bzrlib/pack.py
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class ContainerWriter(object):
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    """A class for writing containers."""
 
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    """A class for writing containers.
 
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    :attribute records_written: The number of user records added to the
 
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        container. This does not count the prelude or suffix of the container
 
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        introduced by the begin() and end() methods.
 
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    """
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    def __init__(self, write_func):
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        """Constructor.
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        """
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        self._write_func = write_func
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        self.current_offset = 0
 
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        self.records_written = 0
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    def begin(self):
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        """Begin writing a container."""
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        self.write_func("\n")
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        # Finally, the contents.
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        self.write_func(bytes)
 
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        self.records_written += 1
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        # return a memo of where we wrote data to allow random access.
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        return current_offset, self.current_offset - current_offset
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