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cur_file = (self.get_file_text(file_id),)
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yield identifier, cur_file
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"""Get the target for a given file_id.
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It is assumed that the caller already knows that file_id is referencing
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:param file_id: Handle for the symlink entry.
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:return: The path the symlink points to.
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raise NotImplementedError(self.get_symlink_target)
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"""Return the file_id for the root of this tree."""
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raise NotImplementedError(self.get_root_id)