Method whileDo

src/main/java/rx/Statement.java:137–139

Return an Observable that replays the emissions from the source Observable so long as a condtion is true. @param preCondition the condition to evaluate before subscribing to or

(Observable<? extends T> source, Func0<Boolean> preCondition)

     *         Observable so long as <code>preCondition</code> is true
     */
    public static <T> Observable<T> whileDo(Observable<? extends T> source, Func0<Boolean> preCondition) {
        return Observable.create(new OperatorWhileDoWhile<T>(source, preCondition, preCondition));
    }

    /**
     * Return an Observable that emits the emissions from a specified Observable