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Side by Side Diff: sdk/lib/collection/maps.dart

Issue 1154263003: Revert "Make EfficientLength public, as EfficientLengthIterable." (Closed) Base URL: https://github.com/dart-lang/sdk.git@master
Patch Set: Created 5 years, 6 months ago
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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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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 Iterable<V> 114 class _MapBaseValueIterable<V> extends Iterable<V>
115 implements EfficientLengthIterable<V> { 115 implements EfficientLength {
116 final Map _map; 116 final Map _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
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344 map[keyIterator.current] = valueIterator.current; 344 map[keyIterator.current] = valueIterator.current;
345 hasNextKey = keyIterator.moveNext(); 345 hasNextKey = keyIterator.moveNext();
346 hasNextValue = valueIterator.moveNext(); 346 hasNextValue = valueIterator.moveNext();
347 } 347 }
348 348
349 if (hasNextKey || hasNextValue) { 349 if (hasNextKey || hasNextValue) {
350 throw new ArgumentError("Iterables do not have same length."); 350 throw new ArgumentError("Iterables do not have same length.");
351 } 351 }
352 } 352 }
353 } 353 }
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