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1 // Copyright (c) 2014, the Dart project authors. Please see the AUTHORS file | 1 // Copyright (c) 2014, 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 library dart.pkg.collection.canonicalized_map; | 5 library dart.pkg.collection.canonicalized_map; |
6 | 6 |
7 import 'dart:collection'; | 7 import 'dart:collection'; |
8 | 8 |
9 import 'utils.dart'; | 9 import 'utils.dart'; |
10 | 10 |
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28 /** | 28 /** |
29 * Creates an empty canonicalized map. | 29 * Creates an empty canonicalized map. |
30 * | 30 * |
31 * The [canonicalize] function should return the canonical value for the given | 31 * The [canonicalize] function should return the canonical value for the given |
32 * key. Keys with the same canonical value are considered equivalent. | 32 * key. Keys with the same canonical value are considered equivalent. |
33 * | 33 * |
34 * The [isValidKey] function is called before calling [canonicalize] for | 34 * The [isValidKey] function is called before calling [canonicalize] for |
35 * methods that take arbitrary objects. It can be used to filter out keys that | 35 * methods that take arbitrary objects. It can be used to filter out keys that |
36 * can't be canonicalized. | 36 * can't be canonicalized. |
37 */ | 37 */ |
38 CanonicalizedMap(C canonicalize(K key), {bool isValidKey(K key)}) | 38 CanonicalizedMap(C canonicalize(K key), {bool isValidKey(Object key)}) |
39 : _canonicalize = canonicalize, | 39 : _canonicalize = canonicalize, |
40 _isValidKeyFn = isValidKey; | 40 _isValidKeyFn = isValidKey; |
41 | 41 |
42 /** | 42 /** |
43 * Creates a canonicalized map that is initialized with the key/value pairs of | 43 * Creates a canonicalized map that is initialized with the key/value pairs of |
44 * [other]. | 44 * [other]. |
45 * | 45 * |
46 * The [canonicalize] function should return the canonical value for the given | 46 * The [canonicalize] function should return the canonical value for the given |
47 * key. Keys with the same canonical value are considered equivalent. | 47 * key. Keys with the same canonical value are considered equivalent. |
48 * | 48 * |
49 * The [isValidKey] function is called before calling [canonicalize] for | 49 * The [isValidKey] function is called before calling [canonicalize] for |
50 * methods that take arbitrary objects. It can be used to filter out keys that | 50 * methods that take arbitrary objects. It can be used to filter out keys that |
51 * can't be canonicalized. | 51 * can't be canonicalized. |
52 */ | 52 */ |
53 CanonicalizedMap.from(Map<K, V> other, C canonicalize(K key), | 53 CanonicalizedMap.from(Map<K, V> other, C canonicalize(K key), |
54 {bool isValidKey(K key)}) | 54 {bool isValidKey(Object key)}) |
55 : _canonicalize = canonicalize, | 55 : _canonicalize = canonicalize, |
56 _isValidKeyFn = isValidKey { | 56 _isValidKeyFn = isValidKey { |
57 addAll(other); | 57 addAll(other); |
58 } | 58 } |
59 | 59 |
60 V operator [](Object key) { | 60 V operator [](Object key) { |
61 if (!_isValidKey(key)) return null; | 61 if (!_isValidKey(key)) return null; |
62 var pair = _base[_canonicalize(key)]; | 62 var pair = _base[_canonicalize(key)]; |
63 return pair == null ? null : pair.last; | 63 return pair == null ? null : pair.last; |
64 } | 64 } |
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106 return pair == null ? null : pair.last; | 106 return pair == null ? null : pair.last; |
107 } | 107 } |
108 | 108 |
109 Iterable<V> get values => _base.values.map((pair) => pair.last); | 109 Iterable<V> get values => _base.values.map((pair) => pair.last); |
110 | 110 |
111 String toString() => Maps.mapToString(this); | 111 String toString() => Maps.mapToString(this); |
112 | 112 |
113 bool _isValidKey(Object key) => (key == null || key is K) && | 113 bool _isValidKey(Object key) => (key == null || key is K) && |
114 (_isValidKeyFn == null || _isValidKeyFn(key)); | 114 (_isValidKeyFn == null || _isValidKeyFn(key)); |
115 } | 115 } |
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