mirror of https://github.com/knative/pkg.git
57 lines
1.4 KiB
Go
57 lines
1.4 KiB
Go
/*
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Copyright 2020 The Knative 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 kmeta
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// CopyMap makes a copy of the map.
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func CopyMap(a map[string]string) map[string]string {
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ret := make(map[string]string, len(a))
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for k, v := range a {
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ret[k] = v
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}
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return ret
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}
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// UnionMaps returns a map constructed from the union of input maps.
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// where values from latter maps win.
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func UnionMaps(maps ...map[string]string) map[string]string {
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if len(maps) == 0 {
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return map[string]string{}
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}
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out := make(map[string]string, len(maps[0]))
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for _, m := range maps {
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for k, v := range m {
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out[k] = v
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}
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}
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return out
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}
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// FilterMap creates a copy of the provided map, filtering out the elements
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// that match `filter`.
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// nil `filter` is accepted.
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func FilterMap(in map[string]string, filter func(string) bool) map[string]string {
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ret := make(map[string]string, len(in))
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for k, v := range in {
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if filter != nil && filter(k) {
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continue
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}
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ret[k] = v
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}
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return ret
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}
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