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64 lines
1.9 KiB
Python
64 lines
1.9 KiB
Python
#
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# subspace_impl.py
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#
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# This source file is part of the FoundationDB open source project
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#
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# Copyright 2013-2018 Apple Inc. and the FoundationDB project authors
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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#
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# FoundationDB Python API
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import fdb.tuple
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class Subspace (object):
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def __init__(self, prefixTuple=tuple(), rawPrefix=b''):
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self.rawPrefix = fdb.tuple.pack(prefixTuple, prefix=rawPrefix)
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def __repr__(self):
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return 'Subspace(rawPrefix=' + repr(self.rawPrefix) + ')'
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def __getitem__(self, name):
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return Subspace((name,), self.rawPrefix)
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def key(self):
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return self.rawPrefix
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def pack(self, t=tuple()):
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return fdb.tuple.pack(t, prefix=self.rawPrefix)
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def pack_with_versionstamp(self, t=tuple()):
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return fdb.tuple.pack_with_versionstamp(t, prefix=self.rawPrefix)
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def unpack(self, key):
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if not self.contains(key):
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raise ValueError('Cannot unpack key that is not in subspace.')
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return fdb.tuple.unpack(key, prefix_len=len(self.rawPrefix))
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def range(self, t=tuple()):
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p = fdb.tuple.range(t)
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return slice(self.rawPrefix + p.start, self.rawPrefix + p.stop)
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def contains(self, key):
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return key.startswith(self.rawPrefix)
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def as_foundationdb_key(self):
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return self.rawPrefix
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def subspace(self, tuple):
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return Subspace(tuple, self.rawPrefix)
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