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// FIXME(thaJeztah): remove once we are a module; the go:build directive prevents go from downgrading language version to go1.16:
//go:build go1.23
package setmatrix
import (
"sync"
mapset "github.com/deckarep/golang-set/v2"
)
// SetMatrix is a map of Sets.
// The zero value is an empty set matrix ready to use.
//
// SetMatrix values are safe for concurrent use.
type SetMatrix[T comparable] struct {
matrix map[string]mapset.Set[T]
mu sync.Mutex
}
// Get returns the members of the set for a specific key as a slice.
func (s *SetMatrix[T]) Get(key string) ([]T, bool) {
s.mu.Lock()
defer s.mu.Unlock()
set, ok := s.matrix[key]
if !ok {
return nil, ok
}
return set.ToSlice(), ok
}
// Contains is used to verify if an element is in a set for a specific key.
func (s *SetMatrix[T]) Contains(key string, value T) (containsElement, setExists bool) {
s.mu.Lock()
defer s.mu.Unlock()
set, ok := s.matrix[key]
if !ok {
return false, ok
}
return set.Contains(value), ok
}
// Insert inserts the value in the set of a key and returns whether the value is
// inserted (was not already in the set) and the number of elements in the set.
func (s *SetMatrix[T]) Insert(key string, value T) (inserted bool, cardinality int) {
s.mu.Lock()
defer s.mu.Unlock()
set, ok := s.matrix[key]
if !ok {
if s.matrix == nil {
s.matrix = make(map[string]mapset.Set[T])
}
s.matrix[key] = mapset.NewThreadUnsafeSet(value)
return true, 1
}
return set.Add(value), set.Cardinality()
}
// Remove removes the value in the set for a specific key.
func (s *SetMatrix[T]) Remove(key string, value T) (removed bool, cardinality int) {
s.mu.Lock()
defer s.mu.Unlock()
set, ok := s.matrix[key]
if !ok {
return false, 0
}
if set.Contains(value) {
set.Remove(value)
removed = true
// If the set is empty remove it from the matrix
if set.Cardinality() == 0 {
delete(s.matrix, key)
}
}
return removed, set.Cardinality()
}
// Cardinality returns the number of elements in the set for a key.
func (s *SetMatrix[T]) Cardinality(key string) (cardinality int, ok bool) {
s.mu.Lock()
defer s.mu.Unlock()
set, ok := s.matrix[key]
if !ok {
return 0, ok
}
return set.Cardinality(), ok
}
// String returns the string version of the set.
// The empty string is returned if there is no set for key.
func (s *SetMatrix[T]) String(key string) (v string, ok bool) {
s.mu.Lock()
defer s.mu.Unlock()
set, ok := s.matrix[key]
if !ok {
return "", ok
}
return set.String(), ok
}
// Keys returns all the keys in the map.
func (s *SetMatrix[T]) Keys() []string {
s.mu.Lock()
defer s.mu.Unlock()
keys := make([]string, 0, len(s.matrix))
for k := range s.matrix {
keys = append(keys, k)
}
return keys
}
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