From 7eb21ab1b7fec1b3090fc44ea007859cb6b26192 Mon Sep 17 00:00:00 2001
From: akarnokd <akarnokd@gmail.com>
Date: Mon, 28 Apr 2014 10:19:58 +0200
Subject: [PATCH] OperatorSequenceEqual

---
 rxjava-core/src/main/java/rx/Observable.java  |  4 +-
 ...eEqual.java => OperatorSequenceEqual.java} | 50 +++++++++----------
 ...ts.java => OperatorSequenceEqualTest.java} |  2 +-
 3 files changed, 27 insertions(+), 29 deletions(-)
 rename rxjava-core/src/main/java/rx/operators/{OperationSequenceEqual.java => OperatorSequenceEqual.java} (58%)
 rename rxjava-core/src/test/java/rx/operators/{OperationSequenceEqualTests.java => OperatorSequenceEqualTest.java} (99%)

diff --git a/rxjava-core/src/main/java/rx/Observable.java b/rxjava-core/src/main/java/rx/Observable.java
index 746362ca78..7d6cc41c91 100644
--- a/rxjava-core/src/main/java/rx/Observable.java
+++ b/rxjava-core/src/main/java/rx/Observable.java
@@ -63,7 +63,6 @@
 import rx.operators.OperationParallelMerge;
 import rx.operators.OperationReplay;
 import rx.operators.OperationSample;
-import rx.operators.OperationSequenceEqual;
 import rx.operators.OperationSkip;
 import rx.operators.OperationSkipUntil;
 import rx.operators.OperationSwitch;
@@ -113,6 +112,7 @@
 import rx.operators.OperatorRepeat;
 import rx.operators.OperatorRetry;
 import rx.operators.OperatorScan;
+import rx.operators.OperatorSequenceEqual;
 import rx.operators.OperatorSerialize;
 import rx.operators.OperatorSingle;
 import rx.operators.OperatorSkip;
@@ -2476,7 +2476,7 @@ public final Boolean call(T first, T second) {
      * @see <a href="https://github.com/Netflix/RxJava/wiki/Conditional-and-Boolean-Operators#wiki-sequenceequal">RxJava Wiki: sequenceEqual()</a>
      */
     public final static <T> Observable<Boolean> sequenceEqual(Observable<? extends T> first, Observable<? extends T> second, Func2<? super T, ? super T, Boolean> equality) {
-        return OperationSequenceEqual.sequenceEqual(first, second, equality);
+        return OperatorSequenceEqual.sequenceEqual(first, second, equality);
     }
 
     /**
diff --git a/rxjava-core/src/main/java/rx/operators/OperationSequenceEqual.java b/rxjava-core/src/main/java/rx/operators/OperatorSequenceEqual.java
similarity index 58%
rename from rxjava-core/src/main/java/rx/operators/OperationSequenceEqual.java
rename to rxjava-core/src/main/java/rx/operators/OperatorSequenceEqual.java
index 9d9792edfb..600a8843f6 100644
--- a/rxjava-core/src/main/java/rx/operators/OperationSequenceEqual.java
+++ b/rxjava-core/src/main/java/rx/operators/OperatorSequenceEqual.java
@@ -18,7 +18,6 @@
 import static rx.Observable.concat;
 import static rx.Observable.from;
 import static rx.Observable.zip;
-import rx.Notification;
 import rx.Observable;
 import rx.functions.Func1;
 import rx.functions.Func2;
@@ -28,44 +27,43 @@
  * Returns an Observable that emits a Boolean value that indicate whether two
  * sequences are equal by comparing the elements pairwise.
  */
-public class OperationSequenceEqual {
-
-    public static <T> Observable<Boolean> sequenceEqual(
-            Observable<? extends T> first, Observable<? extends T> second,
-            final Func2<? super T, ? super T, Boolean> equality) {
-        Observable<Notification<T>> firstObservable = concat(
-                first.map(new Func1<T, Notification<T>>() {
+public final class OperatorSequenceEqual {
+    private OperatorSequenceEqual() { throw new IllegalStateException("No instances!"); }
+    /** NotificationLite doesn't work as zip uses it. */
+    private static final Object LOCAL_ONCOMPLETED = new Object();
+    static <T> Observable<Object> materializeLite(Observable<T> source) {
+        return concat(
+                source.map(new Func1<T, Object>() {
 
                     @Override
-                    public Notification<T> call(T t1) {
-                        return Notification.createOnNext(t1);
+                    public Object call(T t1) {
+                        return t1;
                     }
 
-                }), from(Notification.<T>createOnCompleted()));
-
-        Observable<Notification<T>> secondObservable = concat(
-                second.map(new Func1<T, Notification<T>>() {
-
-                    @Override
-                    public Notification<T> call(T t1) {
-                        return Notification.createOnNext(t1);
-                    }
-
-                }), from(Notification.<T>createOnCompleted()));
+                }), from(LOCAL_ONCOMPLETED));
+    }
+    public static <T> Observable<Boolean> sequenceEqual(
+            Observable<? extends T> first, Observable<? extends T> second,
+            final Func2<? super T, ? super T, Boolean> equality) {
+        Observable<Object> firstObservable = materializeLite(first);
+        Observable<Object> secondObservable = materializeLite(second);
 
         return zip(firstObservable, secondObservable,
-                new Func2<Notification<T>, Notification<T>, Boolean>() {
+                new Func2<Object, Object, Boolean>() {
 
                     @Override
-                    public Boolean call(Notification<T> t1, Notification<T> t2) {
-                        if (t1.isOnCompleted() && t2.isOnCompleted()) {
+                    @SuppressWarnings("unchecked")
+                    public Boolean call(Object t1, Object t2) {
+                        boolean c1 = t1 == LOCAL_ONCOMPLETED;
+                        boolean c2 = t2 == LOCAL_ONCOMPLETED;
+                        if (c1 && c2) {
                             return true;
                         }
-                        if (t1.isOnCompleted() || t2.isOnCompleted()) {
+                        if (c1 || c2) {
                             return false;
                         }
                         // Now t1 and t2 must be 'onNext'.
-                        return equality.call(t1.getValue(), t2.getValue());
+                        return equality.call((T)t1, (T)t2);
                     }
 
                 }).all(Functions.<Boolean> identity());
diff --git a/rxjava-core/src/test/java/rx/operators/OperationSequenceEqualTests.java b/rxjava-core/src/test/java/rx/operators/OperatorSequenceEqualTest.java
similarity index 99%
rename from rxjava-core/src/test/java/rx/operators/OperationSequenceEqualTests.java
rename to rxjava-core/src/test/java/rx/operators/OperatorSequenceEqualTest.java
index 94619c028f..1fe95d7f7d 100644
--- a/rxjava-core/src/test/java/rx/operators/OperationSequenceEqualTests.java
+++ b/rxjava-core/src/test/java/rx/operators/OperatorSequenceEqualTest.java
@@ -27,7 +27,7 @@
 import rx.Observer;
 import rx.functions.Func2;
 
-public class OperationSequenceEqualTests {
+public class OperatorSequenceEqualTest {
 
     @Test
     public void test1() {