├── .buildscript
    ├── deploy_snapshot.sh
    └── settings.xml
├── .gitignore
├── .travis.yml
├── CHANGELOG.md
├── LICENSE.txt
├── README.md
├── marbles.key
├── marbles.png
├── pom.xml
├── window-if-changed-kotlin
    ├── pom.xml
    └── src
    │   ├── main
    │       └── kotlin
    │       │   └── com
    │       │       └── jakewharton
    │       │           └── rx
    │       │               └── WindowIfChanged.kt
    │   └── test
    │       └── kotlin
    │           └── com
    │               └── jakewharton
    │                   └── rx
    │                       └── WindowIfChangedTest.kt
└── window-if-changed
    ├── pom.xml
    └── src
        ├── main
            └── java
            │   └── com
            │       └── jakewharton
            │           └── rx
            │               ├── WindowGroupedObservable.java
            │               ├── WindowIfChanged.java
            │               ├── WindowIfChangedObservable.java
            │               └── WindowIfChangedObserver.java
        └── test
            └── java
                └── com
                    └── jakewharton
                        └── rx
                            ├── Message.java
                            └── WindowIfChangedTest.java


/.buildscript/deploy_snapshot.sh:
--------------------------------------------------------------------------------
 1 | #!/bin/bash
 2 | #
 3 | # Deploy a jar, source jar, and javadoc jar to Sonatype's snapshot repo.
 4 | #
 5 | # Adapted from https://coderwall.com/p/9b_lfq and
 6 | # http://benlimmer.com/2013/12/26/automatically-publish-javadoc-to-gh-pages-with-travis-ci/
 7 | 
 8 | SLUG="JakeWharton/RxWindowIfChanged"
 9 | JDK="oraclejdk8"
10 | BRANCH="master"
11 | 
12 | set -e
13 | 
14 | if [ "$TRAVIS_REPO_SLUG" != "$SLUG" ]; then
15 |   echo "Skipping snapshot deployment: wrong repository. Expected '$SLUG' but was '$TRAVIS_REPO_SLUG'."
16 | elif [ "$TRAVIS_JDK_VERSION" != "$JDK" ]; then
17 |   echo "Skipping snapshot deployment: wrong JDK. Expected '$JDK' but was '$TRAVIS_JDK_VERSION'."
18 | elif [ "$TRAVIS_PULL_REQUEST" != "false" ]; then
19 |   echo "Skipping snapshot deployment: was pull request."
20 | elif [ "$TRAVIS_BRANCH" != "$BRANCH" ]; then
21 |   echo "Skipping snapshot deployment: wrong branch. Expected '$BRANCH' but was '$TRAVIS_BRANCH'."
22 | else
23 |   echo "Deploying snapshot..."
24 |   mvn clean source:jar javadoc:jar deploy --settings=".buildscript/settings.xml" -Dmaven.test.skip=true
25 |   echo "Snapshot deployed!"
26 | fi
27 | 


--------------------------------------------------------------------------------
/.buildscript/settings.xml:
--------------------------------------------------------------------------------
 1 | <settings>
 2 |   <servers>
 3 |     <server>
 4 |       <id>sonatype-nexus-snapshots</id>
 5 |       <username>${env.CI_DEPLOY_USERNAME}</username>
 6 |       <password>${env.CI_DEPLOY_PASSWORD}</password>
 7 |     </server>
 8 |   </servers>
 9 | </settings>
10 | 


--------------------------------------------------------------------------------
/.gitignore:
--------------------------------------------------------------------------------
 1 | # Eclipse
 2 | .classpath
 3 | .project
 4 | .settings
 5 | eclipsebin
 6 | 
 7 | # Ant
 8 | bin
 9 | gen
10 | build
11 | out
12 | lib
13 | 
14 | # Maven
15 | target
16 | pom.xml.*
17 | release.properties
18 | 
19 | # IntelliJ
20 | .idea
21 | *.iml
22 | *.iws
23 | *.ipr
24 | classes
25 | 
26 | .DS_Store
27 | 


--------------------------------------------------------------------------------
/.travis.yml:
--------------------------------------------------------------------------------
 1 | language: java
 2 | 
 3 | jdk:
 4 |   - oraclejdk7
 5 |   - oraclejdk8
 6 | 
 7 | after_success:
 8 |   - .buildscript/deploy_snapshot.sh
 9 | 
10 | env:
11 |   global:
12 |     - secure: "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"
13 |     - secure: "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"
14 | 
15 | branches:
16 |   except:
17 |     - gh-pages
18 | 
19 | notifications:
20 |   email: false
21 | 
22 | sudo: false
23 | 
24 | cache:
25 |   directories:
26 |     - $HOME/.m2
27 | 


--------------------------------------------------------------------------------
/CHANGELOG.md:
--------------------------------------------------------------------------------
1 | Change Log
2 | ==========
3 | 
4 | 
5 | Version 1.0.0 *(TBD)*
6 | ----------------------------
7 | 
8 | Initial release.
9 | 


--------------------------------------------------------------------------------
/LICENSE.txt:
--------------------------------------------------------------------------------
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--------------------------------------------------------------------------------
/README.md:
--------------------------------------------------------------------------------
 1 | RxJava Window If Changed
 2 | ======================== 
 3 | 
 4 | The `WindowIfChanged` operator for RxJava 2 divides an `Observable` that emits items into an
 5 | `Observable` that emits `Observables`, each one of which emits some subset of the items from the
 6 | original source. The items in each inner `Observable` all have a common "key" based on a key
 7 | selector function. A new inner `Observable` is emitted and the previous inner `Observable`
 8 | completes each time the key changes from the previous item.
 9 | 
10 | ![marble diagram](marbles.png)
11 | 
12 | ```java
13 | Observable<Actions> actions = //...
14 | 
15 | Observable<GroupedObservable<String, Action>> targetedActions =
16 |     WindowIfChanged.create(actions, action -> action.target);
17 | ```
18 | 
19 | 
20 | Download
21 | --------
22 | 
23 | Maven:
24 | ```xml
25 | <dependency>
26 |   <groupId>com.jakewharton.rx</groupId>
27 |   <artifactId>window-if-changed</artifactId>
28 |   <version>1.0.0</version>
29 | </dependency>
30 | ```
31 | Gradle:
32 | ```groovy
33 | compile 'com.jakewharton.rx:window-if-changed:1.0.0'
34 | ```
35 | 
36 | If you use Kotlin, a package with an extension method for `Observable` is provided. Replace the
37 | `window-if-changed` artifact ID above with `window-if-changed-kotlin`.
38 | 
39 | Snapshots of the development version are available in [Sonatype's `snapshots` repository][snap].
40 | 
41 | 
42 | License
43 | -------
44 | 
45 |     Copyright 2016 Jake Wharton
46 | 
47 |     Licensed under the Apache License, Version 2.0 (the "License");
48 |     you may not use this file except in compliance with the License.
49 |     You may obtain a copy of the License at
50 | 
51 |        http://www.apache.org/licenses/LICENSE-2.0
52 | 
53 |     Unless required by applicable law or agreed to in writing, software
54 |     distributed under the License is distributed on an "AS IS" BASIS,
55 |     WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
56 |     See the License for the specific language governing permissions and
57 |     limitations under the License.
58 | 
59 | 
60 | 
61 |  [snap]: https://oss.sonatype.org/content/repositories/snapshots/
62 | 


--------------------------------------------------------------------------------
/marbles.key:
--------------------------------------------------------------------------------
https://raw.githubusercontent.com/JakeWharton/RxWindowIfChanged/ebc35bd47ba8b124d39629327d7bc0f7ba20bc24/marbles.key


--------------------------------------------------------------------------------
/marbles.png:
--------------------------------------------------------------------------------
https://raw.githubusercontent.com/JakeWharton/RxWindowIfChanged/ebc35bd47ba8b124d39629327d7bc0f7ba20bc24/marbles.png


--------------------------------------------------------------------------------
/pom.xml:
--------------------------------------------------------------------------------
  1 | <?xml version="1.0" encoding="UTF-8"?>
  2 | 
  3 | <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
  4 |   <modelVersion>4.0.0</modelVersion>
  5 | 
  6 |   <parent>
  7 |     <groupId>org.sonatype.oss</groupId>
  8 |     <artifactId>oss-parent</artifactId>
  9 |     <version>7</version>
 10 |   </parent>
 11 | 
 12 |   <groupId>com.jakewharton.rx</groupId>
 13 |   <artifactId>window-if-changed-parent</artifactId>
 14 |   <version>1.0.1-SNAPSHOT</version>
 15 |   <packaging>pom</packaging>
 16 | 
 17 |   <name>RxJava Window If Changed (Parent)</name>
 18 |   <description>An RxJava transformer which combines replay(1), publish(), and refCount() operators.</description>
 19 |   <inceptionYear>2016</inceptionYear>
 20 | 
 21 |   <modules>
 22 |     <module>window-if-changed</module>
 23 |     <module>window-if-changed-kotlin</module>
 24 |   </modules>
 25 | 
 26 |   <scm>
 27 |     <url>http://github.com/JakeWharton/RxWindowIfChanged</url>
 28 |     <connection>scm:git:git://github.com/JakeWharton/RxWindowIfChanged.git</connection>
 29 |     <developerConnection>scm:git:git@github.com:JakeWharton/RxWindowIfChanged.git</developerConnection>
 30 |     <tag>HEAD</tag>
 31 |   </scm>
 32 | 
 33 |   <issueManagement>
 34 |     <system>GitHub Issues</system>
 35 |     <url>http://github.com/JakeWharton/RxWindowIfChanged/issues</url>
 36 |   </issueManagement>
 37 | 
 38 |   <licenses>
 39 |     <license>
 40 |       <name>Apache License Version 2.0</name>
 41 |       <url>http://www.apache.org/licenses/LICENSE-2.0.txt</url>
 42 |       <distribution>repo</distribution>
 43 |     </license>
 44 |   </licenses>
 45 | 
 46 |   <properties>
 47 |     <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
 48 |     <java.version>1.7</java.version>
 49 |     <kotlin.version>1.0.5</kotlin.version>
 50 |   </properties>
 51 | 
 52 |   <dependencyManagement>
 53 |     <dependencies>
 54 |       <dependency>
 55 |         <groupId>io.reactivex.rxjava2</groupId>
 56 |         <artifactId>rxjava</artifactId>
 57 |         <version>2.0.1</version>
 58 |       </dependency>
 59 |       <dependency>
 60 |         <groupId>org.jetbrains.kotlin</groupId>
 61 |         <artifactId>kotlin-stdlib</artifactId>
 62 |         <version>${kotlin.version}</version>
 63 |       </dependency>
 64 |       <dependency>
 65 |         <groupId>junit</groupId>
 66 |         <artifactId>junit</artifactId>
 67 |         <version>4.12</version>
 68 |       </dependency>
 69 |     </dependencies>
 70 |   </dependencyManagement>
 71 | 
 72 |   <build>
 73 |     <plugins>
 74 |       <plugin>
 75 |         <groupId>org.apache.maven.plugins</groupId>
 76 |         <artifactId>maven-compiler-plugin</artifactId>
 77 |         <version>3.3</version>
 78 |         <configuration>
 79 |           <source>${java.version}</source>
 80 |           <target>${java.version}</target>
 81 |         </configuration>
 82 |       </plugin>
 83 |       <plugin>
 84 |         <groupId>org.apache.maven.plugins</groupId>
 85 |         <artifactId>maven-release-plugin</artifactId>
 86 |         <version>2.5</version>
 87 |         <configuration>
 88 |           <autoVersionSubmodules>true</autoVersionSubmodules>
 89 |         </configuration>
 90 |       </plugin>
 91 |     </plugins>
 92 | 
 93 |     <pluginManagement>
 94 |       <plugins>
 95 |         <plugin>
 96 |           <groupId>org.jetbrains.kotlin</groupId>
 97 |           <artifactId>kotlin-maven-plugin</artifactId>
 98 |           <version>${kotlin.version}</version>
 99 |           <executions>
100 |             <execution>
101 |               <id>compile</id>
102 |               <goals>
103 |                 <goal>compile</goal>
104 |               </goals>
105 |             </execution>
106 |             <execution>
107 |               <id>test-compile</id>
108 |               <goals>
109 |                 <goal>test-compile</goal>
110 |               </goals>
111 |             </execution>
112 |           </executions>
113 |         </plugin>
114 |       </plugins>
115 |     </pluginManagement>
116 |   </build>
117 | </project>
118 | 


--------------------------------------------------------------------------------
/window-if-changed-kotlin/pom.xml:
--------------------------------------------------------------------------------
 1 | <?xml version="1.0" encoding="UTF-8"?>
 2 | 
 3 | <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
 4 |   <modelVersion>4.0.0</modelVersion>
 5 |   <properties>
 6 |     <kotlin.version>1.0.0</kotlin.version>
 7 |   </properties>
 8 | 
 9 |   <parent>
10 |     <groupId>com.jakewharton.rx</groupId>
11 |     <artifactId>window-if-changed-parent</artifactId>
12 |     <version>1.0.1-SNAPSHOT</version>
13 |     <relativePath>../pom.xml</relativePath>
14 |   </parent>
15 | 
16 |   <artifactId>window-if-changed-kotlin</artifactId>
17 |   <name>RxJava Window If Changed (Kotlin Extensions)</name>
18 | 
19 |   <dependencies>
20 |     <dependency>
21 |       <groupId>${project.groupId}</groupId>
22 |       <artifactId>window-if-changed</artifactId>
23 |       <version>${project.version}</version>
24 |     </dependency>
25 |     <dependency>
26 |       <groupId>org.jetbrains.kotlin</groupId>
27 |       <artifactId>kotlin-stdlib</artifactId>
28 |     </dependency>
29 |     <dependency>
30 |       <groupId>junit</groupId>
31 |       <artifactId>junit</artifactId>
32 |       <scope>test</scope>
33 |     </dependency>
34 |   </dependencies>
35 | 
36 |   <build>
37 |     <sourceDirectory>${project.basedir}/src/main/kotlin</sourceDirectory>
38 |     <testSourceDirectory>${project.basedir}/src/test/kotlin</testSourceDirectory>
39 | 
40 |     <plugins>
41 |       <plugin>
42 |         <groupId>org.jetbrains.kotlin</groupId>
43 |         <artifactId>kotlin-maven-plugin</artifactId>
44 |         <version>${kotlin.version}</version>
45 |       </plugin>
46 |     </plugins>
47 |   </build>
48 | </project>
49 | 


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/window-if-changed-kotlin/src/main/kotlin/com/jakewharton/rx/WindowIfChanged.kt:
--------------------------------------------------------------------------------
 1 | /*
 2 |  * Copyright 2016 Jake Wharton
 3 |  *
 4 |  * Licensed under the Apache License, Version 2.0 (the "License");
 5 |  * you may not use this file except in compliance with the License.
 6 |  * You may obtain a copy of the License at
 7 |  *
 8 |  *    http://www.apache.org/licenses/LICENSE-2.0
 9 |  *
10 |  * Unless required by applicable law or agreed to in writing, software
11 |  * distributed under the License is distributed on an "AS IS" BASIS,
12 |  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 |  * See the License for the specific language governing permissions and
14 |  * limitations under the License.
15 |  */
16 | package com.jakewharton.rx
17 | 
18 | import io.reactivex.Observable
19 | 
20 | /**
21 |  * TODO
22 |  */
23 | @Suppress("NOTHING_TO_INLINE") // Extension function is for chaining convenience only.
24 | inline fun <T, K> Observable<T>.windowIfChanged(noinline keySelector: (T) -> K)
25 |     = WindowIfChanged.create(this, keySelector)
26 | 


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/window-if-changed-kotlin/src/test/kotlin/com/jakewharton/rx/WindowIfChangedTest.kt:
--------------------------------------------------------------------------------
 1 | /*
 2 |  * Copyright 2016 Jake Wharton
 3 |  *
 4 |  * Licensed under the Apache License, Version 2.0 (the "License");
 5 |  * you may not use this file except in compliance with the License.
 6 |  * You may obtain a copy of the License at
 7 |  *
 8 |  *    http://www.apache.org/licenses/LICENSE-2.0
 9 |  *
10 |  * Unless required by applicable law or agreed to in writing, software
11 |  * distributed under the License is distributed on an "AS IS" BASIS,
12 |  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 |  * See the License for the specific language governing permissions and
14 |  * limitations under the License.
15 |  */
16 | package com.jakewharton.rx
17 | 
18 | import io.reactivex.Observable
19 | import org.junit.Assert.assertNotNull
20 | import org.junit.Test
21 | 
22 | class WindowIfChangedTest {
23 |   @Test fun observableExtensionMethodWorks() {
24 |     val o = Observable.never<String>().windowIfChanged { it }
25 |     assertNotNull(o)
26 |   }
27 | }
28 | 


--------------------------------------------------------------------------------
/window-if-changed/pom.xml:
--------------------------------------------------------------------------------
 1 | <?xml version="1.0" encoding="UTF-8"?>
 2 | 
 3 | <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
 4 |   <modelVersion>4.0.0</modelVersion>
 5 | 
 6 |   <parent>
 7 |     <groupId>com.jakewharton.rx</groupId>
 8 |     <artifactId>window-if-changed-parent</artifactId>
 9 |     <version>1.0.1-SNAPSHOT</version>
10 |     <relativePath>../pom.xml</relativePath>
11 |   </parent>
12 | 
13 |   <artifactId>window-if-changed</artifactId>
14 |   <name>RxJava Window If Changed</name>
15 | 
16 |   <dependencies>
17 |     <dependency>
18 |       <groupId>io.reactivex.rxjava2</groupId>
19 |       <artifactId>rxjava</artifactId>
20 |     </dependency>
21 |     <!-- TODO remove when https://github.com/ReactiveX/RxJava/issues/4813 is fixed. -->
22 |     <dependency>
23 |       <groupId>org.reactivestreams</groupId>
24 |       <artifactId>reactive-streams</artifactId>
25 |       <version>1.0.0</version>
26 |     </dependency>
27 |     <dependency>
28 |       <groupId>junit</groupId>
29 |       <artifactId>junit</artifactId>
30 |       <scope>test</scope>
31 |     </dependency>
32 |   </dependencies>
33 | </project>
34 | 


--------------------------------------------------------------------------------
/window-if-changed/src/main/java/com/jakewharton/rx/WindowGroupedObservable.java:
--------------------------------------------------------------------------------
 1 | /*
 2 |  * Copyright (C) 2016 Jake Wharton
 3 |  *
 4 |  * Licensed under the Apache License, Version 2.0 (the "License");
 5 |  * you may not use this file except in compliance with the License.
 6 |  * You may obtain a copy of the License at
 7 |  *
 8 |  *      http://www.apache.org/licenses/LICENSE-2.0
 9 |  *
10 |  * Unless required by applicable law or agreed to in writing, software
11 |  * distributed under the License is distributed on an "AS IS" BASIS,
12 |  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 |  * See the License for the specific language governing permissions and
14 |  * limitations under the License.
15 |  */
16 | package com.jakewharton.rx;
17 | 
18 | import io.reactivex.Observer;
19 | import io.reactivex.observables.GroupedObservable;
20 | import io.reactivex.subjects.UnicastSubject;
21 | 
22 | final class WindowGroupedObservable<K, T> extends GroupedObservable<K, T> {
23 |   final UnicastSubject<T> state = UnicastSubject.create();
24 | 
25 |   WindowGroupedObservable(K key) {
26 |     super(key);
27 |   }
28 | 
29 |   @Override protected void subscribeActual(Observer<? super T> observer) {
30 |     state.subscribe(observer);
31 |   }
32 | }
33 | 


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/window-if-changed/src/main/java/com/jakewharton/rx/WindowIfChanged.java:
--------------------------------------------------------------------------------
 1 | /*
 2 |  * Copyright (C) 2016 Jake Wharton
 3 |  *
 4 |  * Licensed under the Apache License, Version 2.0 (the "License");
 5 |  * you may not use this file except in compliance with the License.
 6 |  * You may obtain a copy of the License at
 7 |  *
 8 |  *      http://www.apache.org/licenses/LICENSE-2.0
 9 |  *
10 |  * Unless required by applicable law or agreed to in writing, software
11 |  * distributed under the License is distributed on an "AS IS" BASIS,
12 |  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 |  * See the License for the specific language governing permissions and
14 |  * limitations under the License.
15 |  */
16 | package com.jakewharton.rx;
17 | 
18 | import io.reactivex.Observable;
19 | import io.reactivex.functions.Function;
20 | import io.reactivex.observables.GroupedObservable;
21 | 
22 | /**
23 |  * Divides an {@link Observable} that emits items into an {@link Observable} that emits
24 |  * {@link Observable Observables}, each one of which emits some subset of the items from the
25 |  * original source. The items in each inner {@link Observable} all have a common "key" based on a
26 |  * key selector function. A new inner {@link Observable} is emitted and the previous inner
27 |  * {@link Observable} completes each time the key changes from the previous item.
28 |  */
29 | public final class WindowIfChanged {
30 |   public static <T, K> Observable<GroupedObservable<K, T>> create(Observable<T> upstream,
31 |       Function<? super T, ? extends K> keySelector) {
32 |     return new WindowIfChangedObservable<>(upstream, keySelector);
33 |   }
34 | 
35 |   private WindowIfChanged() {
36 |     throw new AssertionError("No instances.");
37 |   }
38 | }
39 | 


--------------------------------------------------------------------------------
/window-if-changed/src/main/java/com/jakewharton/rx/WindowIfChangedObservable.java:
--------------------------------------------------------------------------------
 1 | /*
 2 |  * Copyright (C) 2016 Jake Wharton
 3 |  *
 4 |  * Licensed under the Apache License, Version 2.0 (the "License");
 5 |  * you may not use this file except in compliance with the License.
 6 |  * You may obtain a copy of the License at
 7 |  *
 8 |  *      http://www.apache.org/licenses/LICENSE-2.0
 9 |  *
10 |  * Unless required by applicable law or agreed to in writing, software
11 |  * distributed under the License is distributed on an "AS IS" BASIS,
12 |  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 |  * See the License for the specific language governing permissions and
14 |  * limitations under the License.
15 |  */
16 | package com.jakewharton.rx;
17 | 
18 | import io.reactivex.Observable;
19 | import io.reactivex.Observer;
20 | import io.reactivex.functions.Function;
21 | import io.reactivex.observables.GroupedObservable;
22 | 
23 | final class WindowIfChangedObservable<T, K> extends Observable<GroupedObservable<K, T>> {
24 |   private final Observable<T> upstream;
25 |   private final Function<? super T, ? extends K> keySelector;
26 | 
27 |   WindowIfChangedObservable(Observable<T> upstream, Function<? super T, ? extends K> keySelector) {
28 |     this.upstream = upstream;
29 |     this.keySelector = keySelector;
30 |   }
31 | 
32 |   @Override protected void subscribeActual(Observer<? super GroupedObservable<K, T>> observer) {
33 |     upstream.subscribe(new WindowIfChangedObserver<>(keySelector, observer));
34 |   }
35 | }
36 | 


--------------------------------------------------------------------------------
/window-if-changed/src/main/java/com/jakewharton/rx/WindowIfChangedObserver.java:
--------------------------------------------------------------------------------
 1 | /*
 2 |  * Copyright (C) 2016 Jake Wharton
 3 |  *
 4 |  * Licensed under the Apache License, Version 2.0 (the "License");
 5 |  * you may not use this file except in compliance with the License.
 6 |  * You may obtain a copy of the License at
 7 |  *
 8 |  *      http://www.apache.org/licenses/LICENSE-2.0
 9 |  *
10 |  * Unless required by applicable law or agreed to in writing, software
11 |  * distributed under the License is distributed on an "AS IS" BASIS,
12 |  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 |  * See the License for the specific language governing permissions and
14 |  * limitations under the License.
15 |  */
16 | package com.jakewharton.rx;
17 | 
18 | import io.reactivex.Observer;
19 | import io.reactivex.disposables.Disposable;
20 | import io.reactivex.functions.Function;
21 | import io.reactivex.observables.GroupedObservable;
22 | 
23 | final class WindowIfChangedObserver<T, K> implements Observer<T> {
24 |   private static final Object NOT_SET = new Object();
25 | 
26 |   private final Function<? super T, ? extends K> keySelector;
27 |   private final Observer<? super GroupedObservable<K, T>> observer;
28 | 
29 |   @SuppressWarnings("unchecked") // Safe because of erasure.
30 |   private K key = (K) NOT_SET;
31 |   private WindowGroupedObservable<K, T> window;
32 | 
33 |   WindowIfChangedObserver(Function<? super T, ? extends K> keySelector,
34 |       Observer<? super GroupedObservable<K, T>> observer) {
35 |     this.keySelector = keySelector;
36 |     this.observer = observer;
37 |   }
38 | 
39 |   @Override public void onSubscribe(Disposable d) {
40 |     observer.onSubscribe(d);
41 |   }
42 | 
43 |   @Override public void onNext(T value) {
44 |     K nextKey;
45 |     try {
46 |       nextKey = keySelector.apply(value);
47 |     } catch (Exception e) {
48 |       onError(e);
49 |       return;
50 |     }
51 | 
52 |     K key = this.key;
53 |     WindowGroupedObservable<K, T> window = this.window;
54 | 
55 |     if (key != null ? !key.equals(nextKey) : nextKey != null) {
56 |       if (window != null) {
57 |         window.state.onComplete();
58 |       }
59 |       this.key = nextKey;
60 |       this.window = window = new WindowGroupedObservable<>(nextKey);
61 |       observer.onNext(window);
62 |     }
63 |     window.state.onNext(value);
64 |   }
65 | 
66 |   @Override public void onError(Throwable e) {
67 |     WindowGroupedObservable<K, T> window = this.window;
68 |     if (window != null) {
69 |       window.state.onComplete();
70 | 
71 |       this.key = null;
72 |       this.window = null;
73 |     }
74 | 
75 |     observer.onError(e);
76 |   }
77 | 
78 |   @Override public void onComplete() {
79 |     WindowGroupedObservable<K, T> window = this.window;
80 |     if (window != null) {
81 |       window.state.onComplete();
82 | 
83 |       this.key = null;
84 |       this.window = null;
85 |     }
86 | 
87 |     observer.onComplete();
88 |   }
89 | }
90 | 


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/window-if-changed/src/test/java/com/jakewharton/rx/Message.java:
--------------------------------------------------------------------------------
 1 | package com.jakewharton.rx;
 2 | 
 3 | final class Message {
 4 |   final String user;
 5 |   final String message;
 6 | 
 7 |   Message(String user, String message) {
 8 |     this.user = user;
 9 |     this.message = message;
10 |   }
11 | 
12 |   @Override public String toString() {
13 |     return user + " " + message;
14 |   }
15 | }
16 | 


--------------------------------------------------------------------------------
/window-if-changed/src/test/java/com/jakewharton/rx/WindowIfChangedTest.java:
--------------------------------------------------------------------------------
  1 | package com.jakewharton.rx;
  2 | 
  3 | import io.reactivex.Notification;
  4 | import io.reactivex.Observable;
  5 | import io.reactivex.functions.Function;
  6 | import io.reactivex.observables.GroupedObservable;
  7 | import java.util.concurrent.atomic.AtomicInteger;
  8 | import org.junit.Test;
  9 | 
 10 | public final class WindowIfChangedTest {
 11 |   private final Function<Message, String> userSelector = new Function<Message, String>() {
 12 |     @Override public String apply(Message message) {
 13 |       return message.user;
 14 |     }
 15 |   };
 16 | 
 17 |   @Test public void splits() {
 18 |     Observable<Message> messages = Observable.just( //
 19 |         new Message("Bob", "Hello"), //
 20 |         new Message("Bob", "World"), //
 21 |         new Message("Alice", "Hey"), //
 22 |         new Message("Bob", "What's"), //
 23 |         new Message("Bob", "Up?"), //
 24 |         new Message("Eve", "Hey") //
 25 |     );
 26 |     final AtomicInteger seen = new AtomicInteger();
 27 |     WindowIfChanged.create(messages, userSelector)
 28 |         .switchMap(
 29 |             new Function<GroupedObservable<String, Message>, Observable<Notification<String>>>() {
 30 |               @Override public Observable<Notification<String>> apply(
 31 |                   GroupedObservable<String, Message> group) {
 32 |                 final int count = seen.incrementAndGet();
 33 |                 return group.map(new Function<Message, String>() {
 34 |                   @Override public String apply(Message message) throws Exception {
 35 |                     return count + " " + message;
 36 |                   }
 37 |                 }).materialize();
 38 |               }
 39 |             })
 40 |         .test()
 41 |         .assertValues( //
 42 |             Notification.createOnNext("1 Bob Hello"), //
 43 |             Notification.createOnNext("1 Bob World"), //
 44 |             Notification.<String>createOnComplete(), //
 45 |             Notification.createOnNext("2 Alice Hey"), //
 46 |             Notification.<String>createOnComplete(), //
 47 |             Notification.createOnNext("3 Bob What's"), //
 48 |             Notification.createOnNext("3 Bob Up?"), //
 49 |             Notification.<String>createOnComplete(), //
 50 |             Notification.createOnNext("4 Eve Hey"), //
 51 |             Notification.<String>createOnComplete()); //
 52 |   }
 53 | 
 54 |   @Test public void completeCompletesInner() {
 55 |     Observable<Message> messages = Observable.just(new Message("Bob", "Hello"));
 56 |     final AtomicInteger seen = new AtomicInteger();
 57 |     WindowIfChanged.create(messages, userSelector)
 58 |         .switchMap(
 59 |             new Function<GroupedObservable<String, Message>, Observable<Notification<String>>>() {
 60 |               @Override public Observable<Notification<String>> apply(
 61 |                   GroupedObservable<String, Message> group) {
 62 |                 final int count = seen.incrementAndGet();
 63 |                 return group.map(new Function<Message, String>() {
 64 |                   @Override public String apply(Message message) throws Exception {
 65 |                     return count + " " + message;
 66 |                   }
 67 |                 }).materialize();
 68 |               }
 69 |             })
 70 |         .test()
 71 |         .assertValues( //
 72 |             Notification.createOnNext("1 Bob Hello"), //
 73 |             Notification.<String>createOnComplete()) //
 74 |         .assertComplete();
 75 |   }
 76 | 
 77 |   @Test public void errorCompletesInner() {
 78 |     RuntimeException error = new RuntimeException("boom!");
 79 |     Observable<Message> messages = Observable.just( //
 80 |         Notification.createOnNext(new Message("Bob", "Hello")),
 81 |         Notification.createOnError(error)
 82 |     ).dematerialize();
 83 |     final AtomicInteger seen = new AtomicInteger();
 84 |     WindowIfChanged.create(messages, userSelector)
 85 |         .switchMap(
 86 |             new Function<GroupedObservable<String, Message>, Observable<Notification<String>>>() {
 87 |               @Override public Observable<Notification<String>> apply(
 88 |                   GroupedObservable<String, Message> group) {
 89 |                 final int count = seen.incrementAndGet();
 90 |                 return group.map(new Function<Message, String>() {
 91 |                   @Override public String apply(Message message) throws Exception {
 92 |                     return count + " " + message;
 93 |                   }
 94 |                 }).materialize();
 95 |               }
 96 |             })
 97 |         .test()
 98 |         .assertValues( //
 99 |             Notification.createOnNext("1 Bob Hello"), //
100 |             Notification.<String>createOnComplete()) //
101 |         .assertError(error);
102 |   }
103 | }
104 | 


--------------------------------------------------------------------------------