forked from TrueCloudLab/restic
111 lines
1.9 KiB
Go
111 lines
1.9 KiB
Go
package restic
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import "sort"
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// IDSet is a set of IDs.
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type IDSet map[ID]struct{}
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// NewIDSet returns a new IDSet, populated with ids.
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func NewIDSet(ids ...ID) IDSet {
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m := make(IDSet)
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for _, id := range ids {
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m[id] = struct{}{}
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}
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return m
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}
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// Has returns true iff id is contained in the set.
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func (s IDSet) Has(id ID) bool {
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_, ok := s[id]
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return ok
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}
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// Insert adds id to the set.
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func (s IDSet) Insert(id ID) {
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s[id] = struct{}{}
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}
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// Delete removes id from the set.
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func (s IDSet) Delete(id ID) {
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delete(s, id)
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}
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// List returns a slice of all IDs in the set.
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func (s IDSet) List() IDs {
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list := make(IDs, 0, len(s))
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for id := range s {
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list = append(list, id)
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}
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sort.Sort(list)
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return list
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}
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// Equals returns true iff s equals other.
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func (s IDSet) Equals(other IDSet) bool {
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if len(s) != len(other) {
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return false
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}
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for id := range s {
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if _, ok := other[id]; !ok {
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return false
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}
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}
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// length + one-way comparison is sufficient implication of equality
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return true
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}
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// Merge adds the blobs in other to the current set.
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func (s IDSet) Merge(other IDSet) {
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for id := range other {
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s.Insert(id)
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}
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}
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// Intersect returns a new set containing the IDs that are present in both sets.
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func (s IDSet) Intersect(other IDSet) (result IDSet) {
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result = NewIDSet()
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set1 := s
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set2 := other
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// iterate over the smaller set
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if len(set2) < len(set1) {
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set1, set2 = set2, set1
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}
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for id := range set1 {
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if set2.Has(id) {
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result.Insert(id)
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}
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}
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return result
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}
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// Sub returns a new set containing all IDs that are present in s but not in
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// other.
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func (s IDSet) Sub(other IDSet) (result IDSet) {
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result = NewIDSet()
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for id := range s {
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if !other.Has(id) {
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result.Insert(id)
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}
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}
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return result
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}
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func (s IDSet) String() string {
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str := s.List().String()
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if len(str) < 2 {
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return "{}"
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}
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return "{" + str[1:len(str)-1] + "}"
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}
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