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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 part of dart.collection; | 5 part of dart.collection; |
6 | 6 |
7 /** | 7 /** |
8 * Base class for implementing a [Map]. | 8 * Base class for implementing a [Map]. |
9 * | 9 * |
10 * This class has a basic implementation of all but five of the members of | 10 * This class has a basic implementation of all but five of the members of |
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61 } | 61 } |
62 | 62 |
63 bool containsValue(Object value) { | 63 bool containsValue(Object value) { |
64 for (K key in keys) { | 64 for (K key in keys) { |
65 if (this[key] == value) return true; | 65 if (this[key] == value) return true; |
66 } | 66 } |
67 return false; | 67 return false; |
68 } | 68 } |
69 | 69 |
70 V putIfAbsent(K key, V ifAbsent()) { | 70 V putIfAbsent(K key, V ifAbsent()) { |
71 if (keys.contains(key)) { | 71 if (containsKey(key)) { |
72 return this[key]; | 72 return this[key]; |
73 } | 73 } |
74 return this[key] = ifAbsent(); | 74 return this[key] = ifAbsent(); |
75 } | 75 } |
76 | 76 |
77 bool containsKey(Object key) => keys.contains(key); | 77 bool containsKey(Object key) => keys.contains(key); |
78 int get length => keys.length; | 78 int get length => keys.length; |
79 bool get isEmpty => keys.isEmpty; | 79 bool get isEmpty => keys.isEmpty; |
80 bool get isNotEmpty => keys.isNotEmpty; | 80 bool get isNotEmpty => keys.isNotEmpty; |
81 Iterable<V> get values => new _MapBaseValueIterable<V>(this); | 81 Iterable<V> get values => new _MapBaseValueIterable<K, V>(this); |
82 String toString() => Maps.mapToString(this); | 82 String toString() => Maps.mapToString(this); |
83 } | 83 } |
84 | 84 |
85 /** | 85 /** |
86 * Basic implementation of an unmodifiable [Map]. | 86 * Basic implementation of an unmodifiable [Map]. |
87 * | 87 * |
88 * This class has a basic implementation of all but two of the members of | 88 * This class has a basic implementation of all but two of the members of |
89 * an umodifiable [Map]. | 89 * an umodifiable [Map]. |
90 * A simple unmodifiable `Map` class can be implemented by extending this | 90 * A simple unmodifiable `Map` class can be implemented by extending this |
91 * class and implementing `keys` and `operator[]`. | 91 * class and implementing `keys` and `operator[]`. |
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104 abstract class UnmodifiableMapBase<K, V> = | 104 abstract class UnmodifiableMapBase<K, V> = |
105 MapBase<K, V> with _UnmodifiableMapMixin<K, V>; | 105 MapBase<K, V> with _UnmodifiableMapMixin<K, V>; |
106 | 106 |
107 /** | 107 /** |
108 * Implementation of [Map.values] based on the map and its [Map.keys] iterable. | 108 * Implementation of [Map.values] based on the map and its [Map.keys] iterable. |
109 * | 109 * |
110 * Iterable that iterates over the values of a `Map`. | 110 * Iterable that iterates over the values of a `Map`. |
111 * It accesses the values by iterating over the keys of the map, and using the | 111 * It accesses the values by iterating over the keys of the map, and using the |
112 * map's `operator[]` to lookup the keys. | 112 * map's `operator[]` to lookup the keys. |
113 */ | 113 */ |
114 class _MapBaseValueIterable<V> extends IterableBase<V> | 114 class _MapBaseValueIterable<K, V> extends Iterable<V> |
115 implements EfficientLength { | 115 implements EfficientLength { |
116 final Map _map; | 116 final Map<K, V> _map; |
117 _MapBaseValueIterable(this._map); | 117 _MapBaseValueIterable(this._map); |
118 | 118 |
119 int get length => _map.length; | 119 int get length => _map.length; |
120 bool get isEmpty => _map.isEmpty; | 120 bool get isEmpty => _map.isEmpty; |
121 bool get isNotEmpty => _map.isNotEmpty; | 121 bool get isNotEmpty => _map.isNotEmpty; |
122 V get first => _map[_map.keys.first]; | 122 V get first => _map[_map.keys.first]; |
123 V get single => _map[_map.keys.single]; | 123 V get single => _map[_map.keys.single]; |
124 V get last => _map[_map.keys.last]; | 124 V get last => _map[_map.keys.last]; |
125 | 125 |
126 Iterator<V> get iterator => new _MapBaseValueIterator<V>(_map); | 126 Iterator<V> get iterator => new _MapBaseValueIterator<K, V>(_map); |
127 } | 127 } |
128 | 128 |
129 /** | 129 /** |
130 * Iterator created by [_MapBaseValueIterable]. | 130 * Iterator created by [_MapBaseValueIterable]. |
131 * | 131 * |
132 * Iterates over the values of a map by iterating its keys and lookup up the | 132 * Iterates over the values of a map by iterating its keys and lookup up the |
133 * values. | 133 * values. |
134 */ | 134 */ |
135 class _MapBaseValueIterator<V> implements Iterator<V> { | 135 class _MapBaseValueIterator<K, V> implements Iterator<V> { |
136 final Iterator _keys; | 136 final Iterator<K> _keys; |
137 final Map _map; | 137 final Map<K, V> _map; |
138 V _current = null; | 138 V _current = null; |
139 | 139 |
140 _MapBaseValueIterator(Map map) : _map = map, _keys = map.keys.iterator; | 140 _MapBaseValueIterator(Map<K, V> map) |
| 141 : _map = map, |
| 142 _keys = map.keys.iterator; |
141 | 143 |
142 bool moveNext() { | 144 bool moveNext() { |
143 if (_keys.moveNext()) { | 145 if (_keys.moveNext()) { |
144 _current = _map[_keys.current]; | 146 _current = _map[_keys.current]; |
145 return true; | 147 return true; |
146 } | 148 } |
147 _current = null; | 149 _current = null; |
148 return false; | 150 return false; |
149 } | 151 } |
150 | 152 |
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211 class UnmodifiableMapView<K, V> = | 213 class UnmodifiableMapView<K, V> = |
212 MapView<K, V> with _UnmodifiableMapMixin<K, V>; | 214 MapView<K, V> with _UnmodifiableMapMixin<K, V>; |
213 | 215 |
214 /** | 216 /** |
215 * Helper class which implements complex [Map] operations | 217 * Helper class which implements complex [Map] operations |
216 * in term of basic ones ([Map.keys], [Map.operator []], | 218 * in term of basic ones ([Map.keys], [Map.operator []], |
217 * [Map.operator []=] and [Map.remove].) Not all methods are | 219 * [Map.operator []=] and [Map.remove].) Not all methods are |
218 * necessary to implement each particular operation. | 220 * necessary to implement each particular operation. |
219 */ | 221 */ |
220 class Maps { | 222 class Maps { |
221 static bool containsValue(Map map, value) { | 223 static bool containsValue(Map map, Object value) { |
222 for (final v in map.values) { | 224 for (final v in map.values) { |
223 if (value == v) { | 225 if (v == value) { |
224 return true; | 226 return true; |
225 } | 227 } |
226 } | 228 } |
227 return false; | 229 return false; |
228 } | 230 } |
229 | 231 |
230 static bool containsKey(Map map, key) { | 232 static bool containsKey(Map map, Object key) { |
231 for (final k in map.keys) { | 233 for (final k in map.keys) { |
232 if (key == k) { | 234 if (k == key) { |
233 return true; | 235 return true; |
234 } | 236 } |
235 } | 237 } |
236 return false; | 238 return false; |
237 } | 239 } |
238 | 240 |
239 static putIfAbsent(Map map, key, ifAbsent()) { | 241 static putIfAbsent(Map map, key, ifAbsent()) { |
240 if (map.containsKey(key)) { | 242 if (map.containsKey(key)) { |
241 return map[key]; | 243 return map[key]; |
242 } | 244 } |
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278 * or maps, the contained reference is rendered as [:'{...}':]. This | 280 * or maps, the contained reference is rendered as [:'{...}':]. This |
279 * prevents the infinite regress that would otherwise occur. So, for example, | 281 * prevents the infinite regress that would otherwise occur. So, for example, |
280 * calling this method on a map whose sole entry maps the string key 'me' | 282 * calling this method on a map whose sole entry maps the string key 'me' |
281 * to a reference to the map would return [:'{me: {...}}':]. | 283 * to a reference to the map would return [:'{me: {...}}':]. |
282 * | 284 * |
283 * A typical implementation of a map's [toString] method will | 285 * A typical implementation of a map's [toString] method will |
284 * simply return the results of this method applied to the collection. | 286 * simply return the results of this method applied to the collection. |
285 */ | 287 */ |
286 static String mapToString(Map m) { | 288 static String mapToString(Map m) { |
287 // Reuse the list in IterableBase for detecting toString cycles. | 289 // Reuse the list in IterableBase for detecting toString cycles. |
288 if (IterableBase._isToStringVisiting(m)) { return '{...}'; } | 290 if (_isToStringVisiting(m)) { return '{...}'; } |
289 | 291 |
290 var result = new StringBuffer(); | 292 var result = new StringBuffer(); |
291 try { | 293 try { |
292 IterableBase._toStringVisiting.add(m); | 294 _toStringVisiting.add(m); |
293 result.write('{'); | 295 result.write('{'); |
294 bool first = true; | 296 bool first = true; |
295 m.forEach((k, v) { | 297 m.forEach((k, v) { |
296 if(!first) { | 298 if(!first) { |
297 result.write(', '); | 299 result.write(', '); |
298 } | 300 } |
299 first = false; | 301 first = false; |
300 result.write(k); | 302 result.write(k); |
301 result.write(': '); | 303 result.write(': '); |
302 result.write(v); | 304 result.write(v); |
303 }); | 305 }); |
304 result.write('}'); | 306 result.write('}'); |
305 } finally { | 307 } finally { |
306 assert(identical(IterableBase._toStringVisiting.last, m)); | 308 assert(identical(_toStringVisiting.last, m)); |
307 IterableBase._toStringVisiting.removeLast(); | 309 _toStringVisiting.removeLast(); |
308 } | 310 } |
309 | 311 |
310 return result.toString(); | 312 return result.toString(); |
311 } | 313 } |
312 | 314 |
313 static _id(x) => x; | 315 static _id(x) => x; |
314 | 316 |
315 /** | 317 /** |
316 * Fills a map with key/value pairs computed from [iterable]. | 318 * Fills a map with key/value pairs computed from [iterable]. |
317 * | 319 * |
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344 map[keyIterator.current] = valueIterator.current; | 346 map[keyIterator.current] = valueIterator.current; |
345 hasNextKey = keyIterator.moveNext(); | 347 hasNextKey = keyIterator.moveNext(); |
346 hasNextValue = valueIterator.moveNext(); | 348 hasNextValue = valueIterator.moveNext(); |
347 } | 349 } |
348 | 350 |
349 if (hasNextKey || hasNextValue) { | 351 if (hasNextKey || hasNextValue) { |
350 throw new ArgumentError("Iterables do not have same length."); | 352 throw new ArgumentError("Iterables do not have same length."); |
351 } | 353 } |
352 } | 354 } |
353 } | 355 } |
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