81 lines
2.2 KiB
Go
81 lines
2.2 KiB
Go
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/*
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Copyright 2014 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 labels
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import (
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"sort"
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"strings"
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)
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// Labels allows you to present labels independently from their storage.
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type Labels interface {
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// Has returns whether the provided label exists.
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Has(label string) (exists bool)
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// Get returns the value for the provided label.
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Get(label string) (value string)
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}
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// Set is a map of label:value. It implements Labels.
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type Set map[string]string
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// String returns all labels listed as a human readable string.
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// Conveniently, exactly the format that ParseSelector takes.
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func (ls Set) String() string {
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selector := make([]string, 0, len(ls))
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for key, value := range ls {
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selector = append(selector, key+"="+value)
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}
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// Sort for determinism.
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sort.StringSlice(selector).Sort()
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return strings.Join(selector, ",")
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}
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// Has returns whether the provided label exists in the map.
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func (ls Set) Has(label string) bool {
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_, exists := ls[label]
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return exists
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}
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// Get returns the value in the map for the provided label.
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func (ls Set) Get(label string) string {
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return ls[label]
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}
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// AsSelector converts labels into a selectors.
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func (ls Set) AsSelector() Selector {
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return SelectorFromSet(ls)
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}
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// AsSelectorPreValidated converts labels into a selector, but
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// assumes that labels are already validated and thus don't
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// preform any validation.
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// According to our measurements this is significantly faster
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// in codepaths that matter at high sccale.
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func (ls Set) AsSelectorPreValidated() Selector {
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return SelectorFromValidatedSet(ls)
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}
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// FormatLables convert label map into plain string
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func FormatLabels(labelMap map[string]string) string {
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l := Set(labelMap).String()
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if l == "" {
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l = "<none>"
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}
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return l
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}
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