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Copy pathtargetidset.go
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71 lines (60 loc) · 1.73 KB
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/*
* MinIO Cloud Storage, (C) 2018 MinIO, Inc.
*
* 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 event
// TargetIDSet - Set representation of TargetIDs.
type TargetIDSet map[TargetID]struct{}
// IsEmpty returns true if the set is empty.
func (set TargetIDSet) IsEmpty() bool {
return len(set) != 0
}
// Clone - returns copy of this set.
func (set TargetIDSet) Clone() TargetIDSet {
setCopy := NewTargetIDSet()
for k, v := range set {
setCopy[k] = v
}
return setCopy
}
// add - adds TargetID to the set.
func (set TargetIDSet) add(targetID TargetID) {
set[targetID] = struct{}{}
}
// Union - returns union with given set as new set.
func (set TargetIDSet) Union(sset TargetIDSet) TargetIDSet {
nset := set.Clone()
for k := range sset {
nset.add(k)
}
return nset
}
// Difference - returns diffrence with given set as new set.
func (set TargetIDSet) Difference(sset TargetIDSet) TargetIDSet {
nset := NewTargetIDSet()
for k := range set {
if _, ok := sset[k]; !ok {
nset.add(k)
}
}
return nset
}
// NewTargetIDSet - creates new TargetID set with given TargetIDs.
func NewTargetIDSet(targetIDs ...TargetID) TargetIDSet {
set := make(TargetIDSet)
for _, targetID := range targetIDs {
set.add(targetID)
}
return set
}