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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 patch class Expando<T> { | 5 patch class Expando<T> { |
6 /* patch */ Expando([String this.name]) | 6 /* patch */ Expando([String this.name]) |
7 : _data = new List(_minSize), | 7 : _data = new List(_minSize), |
8 _used = 0; | 8 _used = 0; |
9 | 9 |
10 static const _minSize = 8; | 10 static const _minSize = 8; |
11 static final _deletedEntry = new _WeakProperty(null, null); | 11 static final _deletedEntry = new _WeakProperty(null, null); |
12 | 12 |
13 /* patch */ T operator[](Object object) { | 13 /* patch */ T operator[](Object object) { |
14 _checkType(object); | 14 _checkType(object); |
15 | 15 |
16 var mask = _size - 1; | 16 var mask = _size - 1; |
17 var idx = object.hashCode & mask; | 17 var idx = object._identityHashCode & mask; |
18 var wp = _data[idx]; | 18 var wp = _data[idx]; |
19 | 19 |
20 while (wp != null) { | 20 while (wp != null) { |
21 if (identical(wp.key, object)) { | 21 if (identical(wp.key, object)) { |
22 return wp.value; | 22 return wp.value; |
23 } else if (wp.key == null) { | 23 } else if (wp.key == null) { |
24 // This entry has been cleared by the GC. | 24 // This entry has been cleared by the GC. |
25 _data[idx] = _deletedEntry; | 25 _data[idx] = _deletedEntry; |
26 } | 26 } |
27 idx = (idx + 1) & mask; | 27 idx = (idx + 1) & mask; |
28 wp = _data[idx]; | 28 wp = _data[idx]; |
29 } | 29 } |
30 | 30 |
31 return null; | 31 return null; |
32 } | 32 } |
33 | 33 |
34 /* patch */ void operator[]=(Object object, T value) { | 34 /* patch */ void operator[]=(Object object, T value) { |
35 _checkType(object); | 35 _checkType(object); |
36 | 36 |
37 var mask = _size - 1; | 37 var mask = _size - 1; |
38 var idx = object.hashCode & mask; | 38 var idx = object._identityHashCode & mask; |
39 var empty_idx = -1; | 39 var empty_idx = -1; |
40 var wp = _data[idx]; | 40 var wp = _data[idx]; |
41 | 41 |
42 while (wp != null) { | 42 while (wp != null) { |
43 if (identical(wp.key, object)) { | 43 if (identical(wp.key, object)) { |
44 if (value != null) { | 44 if (value != null) { |
45 // Update the associated value. | 45 // Update the associated value. |
46 wp.value = value; | 46 wp.value = value; |
47 } else { | 47 } else { |
48 // Mark the entry as deleted. | 48 // Mark the entry as deleted. |
49 _data[idx] = _deletedEntry; | 49 _data[idx] = _deletedEntry; |
50 } | 50 } |
51 return; | 51 return; |
52 } else if ((empty_idx < 0) && identical(wp, _deletedEntry)) { | 52 } else if ((empty_idx < 0) && identical(wp, _deletedEntry)) { |
53 empty_idx = idx; // Insert at this location if not found. | 53 empty_idx = idx; // Insert at this location if not found. |
54 } else if (wp.key == null) { | 54 } else if (wp.key == null) { |
55 // This entry has been cleared by the GC. | 55 // This entry has been cleared by the GC. |
56 _data[idx] = _deletedEntry; | 56 _data[idx] = _deletedEntry; |
57 if (empty_idx < 0) { | 57 if (empty_idx < 0) { |
58 empty_idx = idx; // Insert at this location if not found. | 58 empty_idx = idx; // Insert at this location if not found. |
59 } | 59 } |
60 } | 60 } |
61 idx = (idx + 1) & mask; | 61 idx = (idx + 1) & mask; |
62 wp = _data[idx]; | 62 wp = _data[idx]; |
63 } | 63 } |
64 | 64 |
65 if (value == null) { | 65 if (value == null) { |
66 // Not entering a null value. We just needed to make sure to clear an | 66 // Not entering a null value. We just needed to make sure to clear an |
67 // existing value if it existed. | 67 // existing value if it existed. |
68 return; | 68 return; |
69 } | 69 } |
70 | 70 |
71 if (empty_idx >= 0) { | 71 if (empty_idx >= 0) { |
72 // We will be reusing the empty slot below. | 72 // We will be reusing the empty slot below. |
73 _used--; | 73 _used--; |
74 idx = empty_idx; | 74 idx = empty_idx; |
75 } | 75 } |
76 | 76 |
77 if (_used < _limit) { | 77 if (_used < _limit) { |
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134 throw new ArgumentError(object); | 134 throw new ArgumentError(object); |
135 } | 135 } |
136 } | 136 } |
137 | 137 |
138 get _size => _data.length; | 138 get _size => _data.length; |
139 get _limit => (3 * (_size ~/ 4)); | 139 get _limit => (3 * (_size ~/ 4)); |
140 | 140 |
141 List _data; | 141 List _data; |
142 int _used; // Number of used (active and deleted) slots. | 142 int _used; // Number of used (active and deleted) slots. |
143 } | 143 } |
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