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1 // Copyright (c) 2012, the Dart project authors. Please see the AUTHORS file | 1 // Copyright (c) 2012, the Dart project authors. Please see the AUTHORS file |
2 // for details. All rights reserved. Use of this source code is governed by a | 2 // for details. All rights reserved. Use of this source code is governed by a |
3 // BSD-style license that can be found in the LICENSE file. | 3 // BSD-style license that can be found in the LICENSE file. |
4 | 4 |
5 /** | 5 /** |
6 * An [Expando] allows adding new properties to objects. | 6 * An [Expando] allows adding new properties to objects. |
7 */ | 7 */ |
8 class Expando<T> { | 8 class Expando<T> { |
9 | 9 |
10 /** | 10 /** |
11 * The name of the this [Expando] as passed to the constructor. If | 11 * The name of the this [Expando] as passed to the constructor. If |
12 * no name was passed to the constructor, the name is [null]. | 12 * no name was passed to the constructor, the name is [null]. |
13 */ | 13 */ |
14 final String name; | 14 final String name; |
15 | 15 |
16 /** | 16 /** |
17 * Creates a new [Expando]. The optional name is only used for | 17 * Creates a new [Expando]. The optional name is only used for |
18 * debugging purposes and creating two different (non-const) | 18 * debugging purposes and creating two different [Expando]s with the |
19 * [Expando]s with the same name yields two [Expando]s that work on | 19 * same name yields two [Expando]s that work on different properties |
20 * different properties of the objects they are used on. | 20 * of the objects they are used on. |
21 */ | 21 */ |
22 const Expando([String this.name]); | 22 external Expando([String name]); |
23 | 23 |
24 /** | 24 /** |
25 * Expando toString method override. | 25 * Expando toString method override. |
26 */ | 26 */ |
27 String toString() => "Expando:$name"; | 27 String toString() => "Expando:$name"; |
28 | 28 |
29 /** | 29 /** |
30 * Gets the value of this [Expando]'s property on the given | 30 * Gets the value of this [Expando]'s property on the given |
31 * object. If the object hasn't been expanded, the method returns | 31 * object. If the object hasn't been expanded, the method returns |
32 * [null]. | 32 * [null]. |
33 */ | 33 */ |
34 external T operator [](Object object); | 34 external T operator [](Object object); |
35 | 35 |
36 /** | 36 /** |
37 * Sets the value of this [Expando]'s property on the given | 37 * Sets the value of this [Expando]'s property on the given |
38 * object. Properties can effectively be removed again by setting | 38 * object. Properties can effectively be removed again by setting |
39 * their value to null. | 39 * their value to null. |
40 */ | 40 */ |
41 external void operator []=(Object object, T value); | 41 external void operator []=(Object object, T value); |
42 | 42 |
43 } | 43 } |
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