Created
October 3, 2016 22:11
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Observable to Iterator bridje by José Paumard
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| * Copyright (C) 2015 José Paumard | |
| * | |
| * This program is free software; you can redistribute it and/or | |
| * modify it under the terms of the GNU General Public License | |
| * as published by the Free Software Foundation; either version 2 | |
| * of the License, or (at your option) any later version. | |
| * | |
| * This program is distributed in the hope that it will be useful, | |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
| * GNU General Public License for more details. | |
| * | |
| * You should have received a copy of the GNU General Public License | |
| * along with this program; if not, write to the Free Software | |
| * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. | |
| */ | |
| package org.paumard.jdk8.util; | |
| import java.util.Iterator; | |
| import java.util.NoSuchElementException; | |
| import java.util.Objects; | |
| import java.util.function.Consumer; | |
| import rx.Observable; | |
| public class IteratorObservable<E> { | |
| interface Wrapper<E> { | |
| E get() ; | |
| default Wrapper<E> set(E e) { | |
| return () -> e ; | |
| } | |
| } | |
| public static <E> Iterator<E> of(Observable<E> observable) { | |
| Objects.requireNonNull(observable) ; | |
| class Adapter implements Iterator<E>, Consumer<E> { | |
| Wrapper<Boolean> valueReady ; | |
| Wrapper<E> nextElement; | |
| public Adapter() { | |
| observable.subscribe( | |
| e -> nextElement.set(e), | |
| t -> valueReady.set(false), | |
| () -> valueReady.set(false) | |
| ) ; | |
| } | |
| @Override | |
| public void accept(E e) { | |
| valueReady.set(true); | |
| nextElement = () -> e; | |
| } | |
| @Override | |
| public boolean hasNext() { | |
| return valueReady.get(); | |
| } | |
| @Override | |
| public E next() { | |
| if (!valueReady.get() && !hasNext()) | |
| throw new NoSuchElementException(); | |
| else { | |
| valueReady.set(false); | |
| return nextElement.get() ; | |
| } | |
| } | |
| } | |
| return new Adapter(); | |
| } | |
| } |
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