86 lines
2.6 KiB
Go
86 lines
2.6 KiB
Go
/*
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Copyright 2018 The Kubernetes Authors.
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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 fieldpath
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import (
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"sort"
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"sigs.k8s.io/structured-merge-diff/v4/value"
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)
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// PathElementValueMap is a map from PathElement to value.Value.
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//
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// TODO(apelisse): We have multiple very similar implementation of this
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// for PathElementSet and SetNodeMap, so we could probably share the
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// code.
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type PathElementValueMap struct {
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members sortedPathElementValues
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}
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func MakePathElementValueMap(size int) PathElementValueMap {
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return PathElementValueMap{
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members: make(sortedPathElementValues, 0, size),
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}
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}
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type pathElementValue struct {
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PathElement PathElement
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Value value.Value
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}
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type sortedPathElementValues []pathElementValue
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// Implement the sort interface; this would permit bulk creation, which would
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// be faster than doing it one at a time via Insert.
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func (spev sortedPathElementValues) Len() int { return len(spev) }
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func (spev sortedPathElementValues) Less(i, j int) bool {
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return spev[i].PathElement.Less(spev[j].PathElement)
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}
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func (spev sortedPathElementValues) Swap(i, j int) { spev[i], spev[j] = spev[j], spev[i] }
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// Insert adds the pathelement and associated value in the map.
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func (s *PathElementValueMap) Insert(pe PathElement, v value.Value) {
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loc := sort.Search(len(s.members), func(i int) bool {
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return !s.members[i].PathElement.Less(pe)
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})
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if loc == len(s.members) {
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s.members = append(s.members, pathElementValue{pe, v})
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return
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}
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if s.members[loc].PathElement.Equals(pe) {
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return
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}
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s.members = append(s.members, pathElementValue{})
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copy(s.members[loc+1:], s.members[loc:])
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s.members[loc] = pathElementValue{pe, v}
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}
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// Get retrieves the value associated with the given PathElement from the map.
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// (nil, false) is returned if there is no such PathElement.
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func (s *PathElementValueMap) Get(pe PathElement) (value.Value, bool) {
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loc := sort.Search(len(s.members), func(i int) bool {
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return !s.members[i].PathElement.Less(pe)
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})
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if loc == len(s.members) {
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return nil, false
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}
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if s.members[loc].PathElement.Equals(pe) {
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return s.members[loc].Value, true
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}
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return nil, false
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}
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