Created
October 17, 2017 07:15
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| import java.util.function.Predicate | |
| class PredicateIterator<T> implements Iterator<T> { | |
| Iterator<T> iterator | |
| Predicate<T> predicate | |
| boolean hasNext = false | |
| T currentElement | |
| T nextElement | |
| PredicateIterator(Iterator<T> iterator, Predicate<T> predicate) { | |
| this.iterator = iterator | |
| this.predicate = predicate | |
| findNext() | |
| } | |
| @Override | |
| boolean hasNext() { | |
| hasNext | |
| } | |
| @Override | |
| T next() { | |
| if (hasNext) | |
| findNext() | |
| } | |
| T findNext() { | |
| if(!iterator.hasNext()) { | |
| hasNext = false | |
| return nextElement | |
| } | |
| while (iterator.hasNext()) { | |
| T element = iterator.next() | |
| if (predicate.test(element)) { | |
| currentElement = nextElement | |
| hasNext = true | |
| nextElement = element | |
| return currentElement | |
| } | |
| } | |
| hasNext = false | |
| nextElement | |
| } | |
| } |
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