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| 1 | +package rx.operators; |
| 2 | + |
| 3 | +import static org.mockito.Mockito.mock; |
| 4 | +import static org.mockito.Mockito.never; |
| 5 | +import static org.mockito.Mockito.times; |
| 6 | +import static org.mockito.Mockito.verify; |
| 7 | + |
| 8 | +import org.junit.Test; |
| 9 | + |
| 10 | +import rx.Observable; |
| 11 | +import rx.Observable.OnSubscribeFunc; |
| 12 | +import rx.Observer; |
| 13 | +import rx.util.functions.Func1; |
| 14 | + |
| 15 | +/** |
| 16 | + * Converts the elements of an observable sequence to the specified type. |
| 17 | + */ |
| 18 | +public class OperationCast { |
| 19 | + |
| 20 | + public static <T, R> OnSubscribeFunc<R> cast( |
| 21 | + Observable<? extends T> source, final Class<R> klass) { |
| 22 | + return OperationMap.map(source, new Func1<T, R>() { |
| 23 | + @SuppressWarnings("unchecked") |
| 24 | + public R call(T t) { |
| 25 | + if (klass.isAssignableFrom(t.getClass())) { |
| 26 | + return (R) t; |
| 27 | + } else { |
| 28 | + throw new ClassCastException(t.getClass() |
| 29 | + + " cannot be cast to " + klass); |
| 30 | + } |
| 31 | + } |
| 32 | + }); |
| 33 | + } |
| 34 | + |
| 35 | + public static class UnitTest { |
| 36 | + |
| 37 | + @Test |
| 38 | + public void testCast() { |
| 39 | + Observable<?> source = Observable.from(1, 2); |
| 40 | + Observable<Integer> observable = Observable.create(cast(source, |
| 41 | + Integer.class)); |
| 42 | + |
| 43 | + @SuppressWarnings("unchecked") |
| 44 | + Observer<Integer> aObserver = mock(Observer.class); |
| 45 | + observable.subscribe(aObserver); |
| 46 | + verify(aObserver, times(1)).onNext(1); |
| 47 | + verify(aObserver, times(1)).onNext(1); |
| 48 | + verify(aObserver, never()).onError( |
| 49 | + org.mockito.Matchers.any(Throwable.class)); |
| 50 | + verify(aObserver, times(1)).onCompleted(); |
| 51 | + } |
| 52 | + |
| 53 | + @Test |
| 54 | + public void testCastWithWrongType() { |
| 55 | + Observable<?> source = Observable.from(1, 2); |
| 56 | + Observable<Boolean> observable = Observable.create(cast(source, |
| 57 | + Boolean.class)); |
| 58 | + |
| 59 | + @SuppressWarnings("unchecked") |
| 60 | + Observer<Boolean> aObserver = mock(Observer.class); |
| 61 | + observable.subscribe(aObserver); |
| 62 | + verify(aObserver, times(1)).onError( |
| 63 | + org.mockito.Matchers.any(ClassCastException.class)); |
| 64 | + } |
| 65 | + } |
| 66 | + |
| 67 | +} |
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