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bzrlib/directory_service.py
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from bzrlib import errors, registry
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from bzrlib.branch import Branch
 
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from bzrlib import urlutils
 
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class DirectoryServiceRegistry(registry.Registry):
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    """This object maintains and uses a list of directory services.
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            'push': branch.get_push_location,
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            'this': lambda: branch.base
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        }
 
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        parts = url.split('/', 1)
 
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        if len(parts) == 2:
 
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            name, extra = parts
 
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        else:
 
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            (name,) = parts
 
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            extra = None
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        try:
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            method = lookups[url[1:]]
 
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            method = lookups[name[1:]]
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        except KeyError:
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            raise errors.InvalidLocationAlias(url)
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        else:
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            result = method()
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        if result is None:
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            raise errors.UnsetLocationAlias(url)
 
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        if extra is not None:
 
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            result = urlutils.join(result, extra)
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        return result
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directories.register(':', AliasDirectory,