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hash_set.go
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/
hash_set.go
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package hashset
import (
"strings"
"github.com/sedraxnet/sedrax/domain/consensus/model/externalapi"
)
// HashSet is an unsorted unique collection of DomainHashes
type HashSet map[externalapi.DomainHash]struct{}
// New creates and returns an empty HashSet
func New() HashSet {
return HashSet{}
}
// NewFromSlice creates and returns a HashSet with contents according to provided slice
func NewFromSlice(hashes ...*externalapi.DomainHash) HashSet {
set := New()
for _, hash := range hashes {
set.Add(hash)
}
return set
}
// String returns a string representation of this hash set
func (hs HashSet) String() string {
hashStrings := make([]string, 0, len(hs))
for hash := range hs {
hashStrings = append(hashStrings, hash.String())
}
return strings.Join(hashStrings, ", ")
}
// Add appends a hash to this HashSet. If given hash already exists - does nothing
func (hs HashSet) Add(hash *externalapi.DomainHash) {
hs[*hash] = struct{}{}
}
// Remove removes a hash from this HashSet. If given hash does not exist in HashSet - does nothing.
func (hs HashSet) Remove(hash *externalapi.DomainHash) {
delete(hs, *hash)
}
// Contains returns true if this HashSet contains the given hash.
func (hs HashSet) Contains(hash *externalapi.DomainHash) bool {
_, ok := hs[*hash]
return ok
}
// Subtract creates and returns a new HashSet that contains all hashes in this HashSet minus the ones in `other`
func (hs HashSet) Subtract(other HashSet) HashSet {
diff := New()
for hash := range hs {
hashCopy := hash
if !other.Contains(&hashCopy) {
diff.Add(&hashCopy)
}
}
return diff
}
// ContainsAllInSlice returns true if this HashSet contains all hashes in given slice
func (hs HashSet) ContainsAllInSlice(slice []*externalapi.DomainHash) bool {
for _, hash := range slice {
if !hs.Contains(hash) {
return false
}
}
return true
}
// ToSlice converts this HashSet into a slice of hashes
func (hs HashSet) ToSlice() []*externalapi.DomainHash {
slice := make([]*externalapi.DomainHash, 0, len(hs))
for hash := range hs {
hashCopy := hash
slice = append(slice, &hashCopy)
}
return slice
}
// Length returns the length of this HashSet
func (hs HashSet) Length() int {
return len(hs)
}