Change zip method signature from Collection to Iterable

rxjava-core/src/main/java/rx/Observable.java

@@ -1891,29 +1891,6 @@ public static <T> Observable<T> from(Future<? extends T> future, long timeout, T
         return create(OperationToObservableFuture.toObservableFuture(future, timeout, unit));
     }
 
-    /**
-     * <p>
-     * <img width="640" src="https://raw.github.com/wiki/Netflix/RxJava/images/rx-operators/zip.png">
-     * <p> {@code zip} applies this function in strict sequence, so the first item emitted by the
-     * new Observable will be the result of the function applied to the first item emitted by {@code w0} and the first item emitted by {@code w1}; the second item emitted by
-     * the new Observable will be the result of the function applied to the second item emitted by {@code w0} and the second item emitted by {@code w1}; and so forth.
-     * <p>
-     * The resulting {@code Observable<R>} returned from {@code zip} will invoke {@link Observer#onNext onNext} as many times as the number of {@code onNext} invocations
-     * of the source Observable that emits the fewest items.
-     * 
-     * @param o1
-     *            one source Observable
-     * @param o2
-     *            another source Observable
-     * @param zipFunction
-     *            a function that, when applied to an item emitted by each of the source
-     *            Observables, results in an item that will be emitted by the resulting Observable
-     * @return an Observable that emits the zipped results
-     */
-    public static <T1, T2, R> Observable<R> zip(Observable<? extends T1> o1, Observable<? extends T2> o2, Func2<? super T1, ? super T2, ? extends R> zipFunction) {
-        return create(OperationZip.zip(o1, o2, zipFunction));
-    }
-
     /**
      * Returns an Observable that emits Boolean values that indicate whether the pairs of items
      * emitted by two source Observables are equal.
@@ -1960,6 +1937,31 @@ public static <T> Observable<Boolean> sequenceEqual(Observable<? extends T> firs
         return zip(first, second, equality);
     }
 
+    /**
+     * Returns an Observable that emits the results of a function of your choosing applied to
+     * combinations of two items emitted, in sequence, by two other Observables.
+     * <p>
+     * <img width="640" src="https://raw.github.com/wiki/Netflix/RxJava/images/rx-operators/zip.png">
+     * <p> {@code zip} applies this function in strict sequence, so the first item emitted by the
+     * new Observable will be the result of the function applied to the first item emitted by {@code w0} and the first item emitted by {@code w1}; the second item emitted by
+     * the new Observable will be the result of the function applied to the second item emitted by {@code w0} and the second item emitted by {@code w1}; and so forth.
+     * <p>
+     * The resulting {@code Observable<R>} returned from {@code zip} will invoke {@link Observer#onNext onNext} as many times as the number of {@code onNext} invocations
+     * of the source Observable that emits the fewest items.
+     * 
+     * @param o1
+     *            one source Observable
+     * @param o2
+     *            another source Observable
+     * @param zipFunction
+     *            a function that, when applied to an item emitted by each of the source
+     *            Observables, results in an item that will be emitted by the resulting Observable
+     * @return an Observable that emits the zipped results
+     */
+    public static <T1, T2, R> Observable<R> zip(Observable<? extends T1> o1, Observable<? extends T2> o2, Func2<? super T1, ? super T2, ? extends R> zipFunction) {
+        return create(OperationZip.zip(o1, o2, zipFunction));
+    }
+
     /**
      * Returns an Observable that emits the results of a function of your choosing applied to
      * combinations of three items emitted, in sequence, by three other Observables.
@@ -2021,7 +2023,7 @@ public static <T1, T2, T3, T4, R> Observable<R> zip(Observable<? extends T1> o1,
 
     /**
      * Returns an Observable that emits the results of a function of your choosing applied to
-     * combinations of four items emitted, in sequence, by four other Observables.
+     * combinations of five items emitted, in sequence, by five other Observables.
      * <p>
      * <img width="640" src="https://raw.github.com/wiki/Netflix/RxJava/images/rx-operators/zip.png">
      * <p> {@code zip} applies this function in strict sequence, so the first item emitted by the
@@ -2054,7 +2056,7 @@ public static <T1, T2, T3, T4, T5, R> Observable<R> zip(Observable<? extends T1>
 
     /**
      * Returns an Observable that emits the results of a function of your choosing applied to
-     * combinations of four items emitted, in sequence, by four other Observables.
+     * combinations of six items emitted, in sequence, by six other Observables.
      * <p>
      * <img width="640" src="https://raw.github.com/wiki/Netflix/RxJava/images/rx-operators/zip.png">
      * <p> {@code zip} applies this function in strict sequence, so the first item emitted by the
@@ -2090,7 +2092,7 @@ public static <T1, T2, T3, T4, T5, T6, R> Observable<R> zip(Observable<? extends
 
     /**
      * Returns an Observable that emits the results of a function of your choosing applied to
-     * combinations of four items emitted, in sequence, by four other Observables.
+     * combinations of seven items emitted, in sequence, by seven other Observables.
      * <p>
      * <img width="640" src="https://raw.github.com/wiki/Netflix/RxJava/images/rx-operators/zip.png">
      * <p> {@code zip} applies this function in strict sequence, so the first item emitted by the
@@ -2128,7 +2130,7 @@ public static <T1, T2, T3, T4, T5, T6, T7, R> Observable<R> zip(Observable<? ext
 
     /**
      * Returns an Observable that emits the results of a function of your choosing applied to
-     * combinations of four items emitted, in sequence, by four other Observables.
+     * combinations of eight items emitted, in sequence, by eight other Observables.
      * <p>
      * <img width="640" src="https://raw.github.com/wiki/Netflix/RxJava/images/rx-operators/zip.png">
      * <p> {@code zip} applies this function in strict sequence, so the first item emitted by the
@@ -2168,7 +2170,7 @@ public static <T1, T2, T3, T4, T5, T6, T7, T8, R> Observable<R> zip(Observable<?
 
     /**
      * Returns an Observable that emits the results of a function of your choosing applied to
-     * combinations of four items emitted, in sequence, by four other Observables.
+     * combinations of nine items emitted, in sequence, by nine other Observables.
      * <p>
      * <img width="640" src="https://raw.github.com/wiki/Netflix/RxJava/images/rx-operators/zip.png">
      * <p> {@code zip} applies this function in strict sequence, so the first item emitted by the
@@ -2680,7 +2682,8 @@ public Observable<Observable<T>> window(long timespan, long timeshift, TimeUnit
 
     /**
      * Returns an Observable that emits the results of a function of your choosing applied to
-     * combinations of four items emitted, in sequence, by four other Observables.
+     * combinations of N items emitted, in sequence, by N other Observables as provided by an Iterable.
+     * 
      * <p> {@code zip} applies this function in strict sequence, so the first item emitted by the
      * new Observable will be the result of the function applied to the first item emitted by
      * all of the Observalbes; the second item emitted by the new Observable will be the result of
@@ -2727,7 +2730,7 @@ public Observable<R> call(List<? extends Observable<?>> wsList) {
      *            Observables, results in an item that will be emitted by the resulting Observable
      * @return an Observable that emits the zipped results
      */
-    public static <R> Observable<R> zip(Collection<? extends Observable<?>> ws, FuncN<? extends R> zipFunction) {
+    public static <R> Observable<R> zip(Iterable<? extends Observable<?>> ws, FuncN<? extends R> zipFunction) {
         return create(OperationZip.zip(ws, zipFunction));
     }
 

rxjava-core/src/main/java/rx/operators/OperationZip.java

@@ -147,7 +147,7 @@ public static <T1, T2, T3, T4, T5, T6, T7, T8, T9, R> OnSubscribeFunc<R> zip(Obs
         return a;
     }
 
-    public static <R> OnSubscribeFunc<R> zip(Collection<? extends Observable<?>> ws, FuncN<? extends R> zipFunction) {
+    public static <R> OnSubscribeFunc<R> zip(Iterable<? extends Observable<?>> ws, FuncN<? extends R> zipFunction) {
         Aggregator<R> a = new Aggregator<R>(zipFunction);
         for (Observable<?> w : ws) {
             ZipObserver<R, Object> zipObserver = new ZipObserver<R, Object>(a, w);