mirror of
https://github.com/gravitational/teleport.git
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59 lines
1.4 KiB
Go
59 lines
1.4 KiB
Go
/*
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Copyright 2019 Gravitational, Inc.
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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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http://www.apache.org/licenses/LICENSE-2.0
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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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package memory
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import (
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"bytes"
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"github.com/google/btree"
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"github.com/gravitational/teleport/lib/backend"
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)
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// btreeItem is a copy of a backend item
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// stored in the B-Tree and containing additional informatoin
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// about B-Tree
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type btreeItem struct {
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backend.Item
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index int
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}
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// Less is used for Btree operations,
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// returns true if item is less than the other one
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func (i *btreeItem) Less(iother btree.Item) bool {
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switch other := iother.(type) {
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case *btreeItem:
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return bytes.Compare(i.Key, other.Key) < 0
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case *prefixItem:
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return !iother.Less(i)
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default:
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return false
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}
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}
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// prefixItem is used for prefix matches on a B-Tree
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type prefixItem struct {
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// prefix is a prefix to match
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prefix []byte
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}
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// Less is used for Btree operations
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func (p *prefixItem) Less(iother btree.Item) bool {
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other := iother.(*btreeItem)
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return !bytes.HasPrefix(other.Key, p.prefix)
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}
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