66 lines
1.2 KiB
Go
66 lines
1.2 KiB
Go
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package cid
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// Set is a implementation of a set of Cids, that is, a structure
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// to which holds a single copy of every Cids that is added to it.
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type Set struct {
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set map[Cid]struct{}
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}
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// NewSet initializes and returns a new Set.
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func NewSet() *Set {
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return &Set{set: make(map[Cid]struct{})}
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}
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// Add puts a Cid in the Set.
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func (s *Set) Add(c Cid) {
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s.set[c] = struct{}{}
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}
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// Has returns if the Set contains a given Cid.
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func (s *Set) Has(c Cid) bool {
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_, ok := s.set[c]
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return ok
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}
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// Remove deletes a Cid from the Set.
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func (s *Set) Remove(c Cid) {
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delete(s.set, c)
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}
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// Len returns how many elements the Set has.
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func (s *Set) Len() int {
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return len(s.set)
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}
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// Keys returns the Cids in the set.
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func (s *Set) Keys() []Cid {
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out := make([]Cid, 0, len(s.set))
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for k := range s.set {
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out = append(out, k)
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}
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return out
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}
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// Visit adds a Cid to the set only if it is
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// not in it already.
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func (s *Set) Visit(c Cid) bool {
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if !s.Has(c) {
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s.Add(c)
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return true
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}
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return false
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}
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// ForEach allows to run a custom function on each
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// Cid in the set.
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func (s *Set) ForEach(f func(c Cid) error) error {
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for c := range s.set {
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err := f(c)
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if err != nil {
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return err
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}
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}
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return nil
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}
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