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package storage
import (
"bufio"
"code.laria.me/petrific/objects"
"fmt"
"io"
"strings"
)
type Index map[objects.ObjectType]map[string]struct{}
func NewIndex() Index {
idx := make(Index)
idx.Init()
return idx
}
func (idx Index) Init() {
for _, t := range objects.AllObjectTypes {
idx[t] = make(map[string]struct{})
}
}
func (idx Index) Set(id objects.ObjectId, typ objects.ObjectType) {
idx[typ][id.String()] = struct{}{}
}
func (idx Index) List(typ objects.ObjectType) []objects.ObjectId {
ids := make([]objects.ObjectId, 0, len(idx[typ]))
for id := range idx[typ] {
ids = append(ids, objects.MustParseObjectId(id))
}
return ids
}
func (idx Index) Save(w io.Writer) error {
for t, objs := range idx {
for id := range objs {
if _, err := fmt.Fprintf(w, "%s %s\n", t, id); err != nil {
return err
}
}
}
return nil
}
func (idx Index) Load(r io.Reader) error {
scan := bufio.NewScanner(r)
for scan.Scan() {
line := scan.Text()
parts := strings.SplitN(strings.TrimSpace(line), " ", 2)
if len(parts) == 2 {
id, err := objects.ParseObjectId(parts[1])
if err != nil {
return err
}
typ := objects.ObjectType(parts[0])
if _, ok := idx[typ]; !ok {
return fmt.Errorf("Failed loading index: Unknown ObjectType %s", typ)
}
idx[typ][id.String()] = struct{}{}
}
}
return scan.Err()
}
func (a Index) Combine(b Index) {
for t, objs := range b {
for id := range objs {
a[t][id] = struct{}{}
}
}
}
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