/**
* Returns the first item emitted by a specified {@link Observable} that matches a predicate, or
* <code>NoSuchElementException</code> if no such item is emitted.
*
* @param predicate a predicate function to evaluate items emitted by the {@link Observable}
* @return the first item emitted by the {@link Observable} that matches the predicate
* @throws NoSuchElementException if no such items are emitted
* @see <a
* href="https://github.com/Netflix/RxJava/wiki/Blocking-Observable-Operators#first-and-firstordefault">RxJava
* Wiki: first()</a>
* @see <a href="http://msdn.microsoft.com/en-us/library/hh229739.aspx">MSDN: Observable.First</a>
*/
public T first(Func1<? super T, Boolean> predicate) {
return from(o.first(predicate)).single();
}
/**
* Returns the first item emitted by a specified {@link Observable}, or <code>
* NoSuchElementException</code> if source contains no elements.
*
* @return the first item emitted by the source {@link Observable}
* @throws NoSuchElementException if source contains no elements
* @see <a
* href="https://github.com/Netflix/RxJava/wiki/Blocking-Observable-Operators#first-and-firstordefault">RxJava
* Wiki: first()</a>
* @see <a href="http://msdn.microsoft.com/en-us/library/hh229177.aspx">MSDN: Observable.First</a>
*/
public T first() {
return from(o.first()).single();
}