| // Copyright (c) 2016, the Dart project authors. Please see the AUTHORS file | |
| // for details. All rights reserved. Use of this source code is governed by a | |
| // BSD-style license that can be found in the LICENSE file. | |
| /** | |
| * The interface `Interner` defines the behavior of objects that can intern | |
| * strings. | |
| */ | |
| abstract class Interner { | |
| /** | |
| * Return a string that is identical to all of the other strings that have | |
| * been interned that are equal to the given [string]. | |
| */ | |
| String intern(String string); | |
| } | |
| /** | |
| * The class `NullInterner` implements an interner that does nothing (does not | |
| * actually intern any strings). | |
| */ | |
| class NullInterner implements Interner { | |
| @override | |
| String intern(String string) => string; | |
| } |