/
string.go
56 lines (52 loc) · 1.64 KB
/
string.go
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// Copyright 2021 Antrea Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package sets
import "k8s.io/apimachinery/pkg/util/sets"
// MergeString merges the src sets into dst and returns dst.
// This assumes that dst is non-nil.
// For example:
// s1 = {a1, a2, a3}
// s2 = {a1, a2, a4, a5}
// MergeString(s1, s2) = {a1, a2, a3, a4, a5}
// s1 = {a1, a2, a3, a4, a5}
//
// It supersedes s1.Union(s2) when constructing a new set is not the intention.
func MergeString(dst, src sets.String) sets.String {
for item := range src {
dst.Insert(item)
}
return dst
}
// SymmetricDifferenceString returns the symmetric difference of two sets.
// For example:
// s1 = {a1, a2, a3}
// s2 = {a1, a2, a4, a5}
// SymmetricDifferenceString(s1, s2) = {a3, a4, a5}
//
// It supersedes s1.Difference(s2).Union(s2.Difference(s1)) which is a little complicated and always builds several
// unnecessary intermediate sets.
func SymmetricDifferenceString(s1, s2 sets.String) sets.String {
result := sets.NewString()
for key := range s1 {
if !s2.Has(key) {
result.Insert(key)
}
}
for key := range s2 {
if !s1.Has(key) {
result.Insert(key)
}
}
return result
}