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Side by Side Diff: runtime/lib/immutable_map.dart

Issue 11238035: Make isEmpty a getter. (Closed) Base URL: https://dart.googlecode.com/svn/branches/bleeding_edge/dart
Patch Set: Update status file with co19 issue number. Created 8 years, 2 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 // Immutable map class for compiler generated map literals. 4 // Immutable map class for compiler generated map literals.
5 5
6 class ImmutableMap<K, V> implements Map<K, V> { 6 class ImmutableMap<K, V> implements Map<K, V> {
7 final _ImmutableArray kvPairs_; 7 final _ImmutableArray kvPairs_;
8 8
9 const ImmutableMap._create(_ImmutableArray keyValuePairs) 9 const ImmutableMap._create(_ImmutableArray keyValuePairs)
10 : kvPairs_ = keyValuePairs; 10 : kvPairs_ = keyValuePairs;
11 11
12 12
13 V operator [](K key) { 13 V operator [](K key) {
14 // TODO(hausner): Since the keys are sorted, we could do a binary 14 // TODO(hausner): Since the keys are sorted, we could do a binary
15 // search. But is it worth it? 15 // search. But is it worth it?
16 for (int i = 0; i < kvPairs_.length - 1; i += 2) { 16 for (int i = 0; i < kvPairs_.length - 1; i += 2) {
17 if (key == kvPairs_[i]) { 17 if (key == kvPairs_[i]) {
18 return kvPairs_[i+1]; 18 return kvPairs_[i+1];
19 } 19 }
20 } 20 }
21 return null; 21 return null;
22 } 22 }
23 23
24 bool isEmpty() { 24 bool get isEmpty {
25 return kvPairs_.length === 0; 25 return kvPairs_.length === 0;
26 } 26 }
27 27
28 int get length { 28 int get length {
29 return kvPairs_.length ~/ 2; 29 return kvPairs_.length ~/ 2;
30 } 30 }
31 31
32 void forEach(void f(K key, V value)) { 32 void forEach(void f(K key, V value)) {
33 for (int i = 0; i < kvPairs_.length; i += 2) { 33 for (int i = 0; i < kvPairs_.length; i += 2) {
34 f(kvPairs_[i], kvPairs_[i+1]); 34 f(kvPairs_[i], kvPairs_[i+1]);
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85 85
86 V remove(K key) { 86 V remove(K key) {
87 throw new UnsupportedError("Cannot remove from unmodifiable Map"); 87 throw new UnsupportedError("Cannot remove from unmodifiable Map");
88 } 88 }
89 89
90 String toString() { 90 String toString() {
91 return Maps.mapToString(this); 91 return Maps.mapToString(this);
92 } 92 }
93 } 93 }
94 94
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