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1 // Copyright 2013 Google Inc. All Rights Reserved. | 1 // Copyright 2013 Google Inc. All Rights Reserved. |
2 // | 2 // |
3 // Licensed under the Apache License, Version 2.0 (the "License"); | 3 // Licensed under the Apache License, Version 2.0 (the "License"); |
4 // you may not use this file except in compliance with the License. | 4 // you may not use this file except in compliance with the License. |
5 // You may obtain a copy of the License at | 5 // You may obtain a copy of the License at |
6 // | 6 // |
7 // http://www.apache.org/licenses/LICENSE-2.0 | 7 // http://www.apache.org/licenses/LICENSE-2.0 |
8 // | 8 // |
9 // Unless required by applicable law or agreed to in writing, software | 9 // Unless required by applicable law or agreed to in writing, software |
10 // distributed under the License is distributed on an "AS IS" BASIS, | 10 // distributed under the License is distributed on an "AS IS" BASIS, |
11 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | 11 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
12 // See the License for the specific language governing permissions and | 12 // See the License for the specific language governing permissions and |
13 // limitations under the License. | 13 // limitations under the License. |
14 | 14 |
15 part of quiver.iterables; | 15 part of quiver.iterables; |
16 | 16 |
17 /** | 17 /// Returns an [Iterable] that infinitely cycles through the elements of |
18 * Returns an [Iterable] that infinitely cycles through the elements of | 18 /// [iterable]. If [iterable] is empty, the returned Iterable will also be empty
. |
19 * [iterable]. If [iterable] is empty, the returned Iterable will also be empty. | |
20 */ | |
21 Iterable cycle(Iterable iterable) => new _Cycle(iterable); | 19 Iterable cycle(Iterable iterable) => new _Cycle(iterable); |
22 | 20 |
23 class _Cycle<T> extends InfiniteIterable<T> { | 21 class _Cycle<T> extends InfiniteIterable<T> { |
24 final Iterable<T> _iterable; | 22 final Iterable<T> _iterable; |
25 | 23 |
26 _Cycle(this._iterable); | 24 _Cycle(this._iterable); |
27 | 25 |
28 Iterator<T> get iterator => new _CycleIterator(_iterable); | 26 Iterator<T> get iterator => new _CycleIterator(_iterable); |
29 | 27 |
30 bool get isEmpty => _iterable.isEmpty; | 28 bool get isEmpty => _iterable.isEmpty; |
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45 T get current => _iterator.current; | 43 T get current => _iterator.current; |
46 | 44 |
47 bool moveNext() { | 45 bool moveNext() { |
48 if (!_iterator.moveNext()) { | 46 if (!_iterator.moveNext()) { |
49 _iterator = _iterable.iterator; | 47 _iterator = _iterable.iterator; |
50 return _iterator.moveNext(); | 48 return _iterator.moveNext(); |
51 } | 49 } |
52 return true; | 50 return true; |
53 } | 51 } |
54 } | 52 } |
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