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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 | 5 |
6 // TODO(srdjan): Use shared array implementation. | 6 // TODO(srdjan): Use shared array implementation. |
7 class _ObjectArray<E> implements List<E> { | 7 class _ObjectArray<E> implements List<E> { |
8 | 8 |
9 factory _ObjectArray(int length) native "ObjectArray_allocate"; | 9 factory _ObjectArray(int length) native "ObjectArray_allocate"; |
10 | 10 |
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131 void set length(int length) { | 131 void set length(int length) { |
132 throw new UnsupportedError( | 132 throw new UnsupportedError( |
133 "Cannot change the length of a non-extendable array"); | 133 "Cannot change the length of a non-extendable array"); |
134 } | 134 } |
135 | 135 |
136 E removeLast() { | 136 E removeLast() { |
137 throw new UnsupportedError( | 137 throw new UnsupportedError( |
138 "Cannot remove in a non-extendable array"); | 138 "Cannot remove in a non-extendable array"); |
139 } | 139 } |
140 | 140 |
141 E get first { | |
142 return this[0]; | |
143 } | |
144 | |
145 E get last { | 141 E get last { |
146 return this[length - 1]; | 142 return this[length - 1]; |
147 } | 143 } |
148 } | 144 } |
149 | 145 |
150 | 146 |
151 // This is essentially the same class as _ObjectArray, but it does not | 147 // This is essentially the same class as _ObjectArray, but it does not |
152 // permit any modification of array elements from Dart code. We use | 148 // permit any modification of array elements from Dart code. We use |
153 // this class for arrays constructed from Dart array literals. | 149 // this class for arrays constructed from Dart array literals. |
154 // TODO(hausner): We should consider the trade-offs between two | 150 // TODO(hausner): We should consider the trade-offs between two |
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282 void set length(int length) { | 278 void set length(int length) { |
283 throw new UnsupportedError( | 279 throw new UnsupportedError( |
284 "Cannot change the length of an immutable array"); | 280 "Cannot change the length of an immutable array"); |
285 } | 281 } |
286 | 282 |
287 E removeLast() { | 283 E removeLast() { |
288 throw new UnsupportedError( | 284 throw new UnsupportedError( |
289 "Cannot remove in a non-extendable array"); | 285 "Cannot remove in a non-extendable array"); |
290 } | 286 } |
291 | 287 |
292 E get first { | |
293 return this[0]; | |
294 } | |
295 | |
296 E get last { | 288 E get last { |
297 return this[length - 1]; | 289 return this[length - 1]; |
298 } | 290 } |
299 } | 291 } |
300 | 292 |
301 | 293 |
302 // Iterator for arrays with fixed size. | 294 // Iterator for arrays with fixed size. |
303 class _FixedSizeArrayIterator<E> implements Iterator<E> { | 295 class _FixedSizeArrayIterator<E> implements Iterator<E> { |
304 _FixedSizeArrayIterator(List array) | 296 _FixedSizeArrayIterator(List array) |
305 : _array = array, _length = array.length, _pos = 0 { | 297 : _array = array, _length = array.length, _pos = 0 { |
306 assert(array is _ObjectArray || array is _ImmutableArray); | 298 assert(array is _ObjectArray || array is _ImmutableArray); |
307 } | 299 } |
308 | 300 |
309 bool get hasNext { | 301 bool get hasNext { |
310 return _length > _pos; | 302 return _length > _pos; |
311 } | 303 } |
312 | 304 |
313 E next() { | 305 E next() { |
314 if (!hasNext) { | 306 if (!hasNext) { |
315 throw new StateError("No more elements"); | 307 throw new StateError("No more elements"); |
316 } | 308 } |
317 return _array[_pos++]; | 309 return _array[_pos++]; |
318 } | 310 } |
319 | 311 |
320 final List<E> _array; | 312 final List<E> _array; |
321 final int _length; // Cache array length for faster access. | 313 final int _length; // Cache array length for faster access. |
322 int _pos; | 314 int _pos; |
323 } | 315 } |
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