Added arn to the main repository

arn/CharacterFinder.go

@@ -0,0 +1,37 @@
+package arn
+
+// CharacterFinder 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 CharacterFinder struct {
+	idToCharacter map[string]*Character
+	mappingName   string
+}
+
+// NewCharacterFinder creates a new finder for external characters.
+func NewCharacterFinder(mappingName string) *CharacterFinder {
+	finder := &CharacterFinder{
+		idToCharacter: map[string]*Character{},
+		mappingName:   mappingName,
+	}
+
+	for character := range StreamCharacters() {
+		finder.Add(character)
+	}
+
+	return finder
+}
+
+// Add adds a character to the search pool.
+func (finder *CharacterFinder) Add(character *Character) {
+	id := character.GetMapping(finder.mappingName)
+
+	if id != "" {
+		finder.idToCharacter[id] = character
+	}
+}
+
+// GetCharacter tries to find an external anime in our anime database.
+func (finder *CharacterFinder) GetCharacter(id string) *Character {
+	return finder.idToCharacter[id]
+}