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// Licensed to Elasticsearch B.V. under one or more contributor
// license agreements. See the NOTICE file distributed with
// this work for additional information regarding copyright
// ownership. Elasticsearch B.V. licenses this file to you 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 common
import "sort"
type StringSet map[string]struct{}
func MakeStringSet(strings ...string) StringSet {
if len(strings) == 0 {
return nil
}
set := StringSet{}
for _, str := range strings {
set[str] = struct{}{}
}
return set
}
func (set StringSet) Add(s string) {
set[s] = struct{}{}
}
func (set StringSet) Del(s string) {
delete(set, s)
}
func (set StringSet) Count() int {
return len(set)
}
func (set StringSet) Has(s string) (exists bool) {
if set != nil {
_, exists = set[s]
}
return
}
// Equals compares this StringSet with another StringSet.
func (set StringSet) Equals(anotherSet StringSet) bool {
if set.Count() != anotherSet.Count() {
return false
}
for k := range set {
if !anotherSet.Has(k) {
return false
}
}
return true
}
// ToSlice returns the items in the set as a sorted slice.
func (set StringSet) ToSlice() []string {
keys := make([]string, 0, len(set))
for key := range set {
keys = append(keys, key)
}
sort.Strings(keys)
return keys
}
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