Added arn to the main repository

arn/AnimeFinder.go

@@ -0,0 +1,30 @@
+package arn
+
+// AnimeFinder holds an internal map of ID to anime mappings
+// and is therefore very efficient to use when trying to find
+// anime by a given service and ID.
+type AnimeFinder struct {
+	idToAnime map[string]*Anime
+}
+
+// NewAnimeFinder creates a new finder for external anime.
+func NewAnimeFinder(mappingName string) *AnimeFinder {
+	finder := &AnimeFinder{
+		idToAnime: map[string]*Anime{},
+	}
+
+	for anime := range StreamAnime() {
+		id := anime.GetMapping(mappingName)
+
+		if id != "" {
+			finder.idToAnime[id] = anime
+		}
+	}
+
+	return finder
+}
+
+// GetAnime tries to find an external anime in our anime database.
+func (finder *AnimeFinder) GetAnime(id string) *Anime {
+	return finder.idToAnime[id]
+}