Full Code of JakeWharton/RxWindowIfChanged for AI

Repository: JakeWharton/RxWindowIfChanged
Branch: trunk
Commit: 7b24208ac5be
Files: 31
Total size: 42.1 KB

Directory structure:
gitextract_j9i2o4fn/

├── .editorconfig
├── .github/
│   ├── pull_request_template.md
│   ├── renovate.json5
│   └── workflows/
│       ├── .java-version
│       ├── build.yaml
│       └── release.yaml
├── .gitignore
├── CHANGELOG.md
├── LICENSE.txt
├── README.md
├── build.gradle
├── gradle/
│   ├── libs.versions.toml
│   └── wrapper/
│       ├── gradle-wrapper.jar
│       └── gradle-wrapper.properties
├── gradle.properties
├── gradlew
├── gradlew.bat
├── marbles.key
├── settings.gradle
├── window-if-changed/
│   ├── build.gradle
│   ├── gradle.properties
│   └── src/
│       ├── main/
│       │   └── java/
│       │       └── com/
│       │           └── jakewharton/
│       │               └── rx/
│       │                   ├── WindowGroupedObservable.java
│       │                   ├── WindowIfChanged.java
│       │                   ├── WindowIfChangedObservable.java
│       │                   └── WindowIfChangedObserver.java
│       └── test/
│           └── java/
│               └── com/
│                   └── jakewharton/
│                       └── rx/
│                           ├── Message.java
│                           └── WindowIfChangedTest.java
└── window-if-changed-kotlin/
    ├── build.gradle
    ├── gradle.properties
    └── src/
        ├── main/
        │   └── kotlin/
        │       └── com/
        │           └── jakewharton/
        │               └── rx/
        │                   └── WindowIfChanged.kt
        └── test/
            └── kotlin/
                └── com/
                    └── jakewharton/
                        └── rx/
                            └── WindowIfChangedTest.kt

================================================
FILE CONTENTS
================================================

================================================
FILE: .editorconfig
================================================
root = true

[*]
indent_size = 2
end_of_line = lf
charset = utf-8
trim_trailing_whitespace = true
insert_final_newline = true

[*.{kt,kts}]
ij_kotlin_allow_trailing_comma = true
ij_kotlin_allow_trailing_comma_on_call_site = true
ij_kotlin_imports_layout = *


================================================
FILE: .github/pull_request_template.md
================================================
---

- [ ] `CHANGELOG.md`'s "Unreleased" section has been updated, if applicable.


================================================
FILE: .github/renovate.json5
================================================
{
  $schema: 'https://docs.renovatebot.com/renovate-schema.json',
  extends: [
    'config:recommended',
  ],
  ignorePresets: [
    // Ensure we get the latest version and are not pinned to old versions.
    'workarounds:javaLTSVersions',
  ],
  customManagers: [
    // Update .java-version file with the latest JDK version.
    {
      customType: 'regex',
      fileMatch: [
        '\\.java-version$',
      ],
      matchStrings: [
        '(?<currentValue>.*)\\n',
      ],
      datasourceTemplate: 'java-version',
      depNameTemplate: 'java',
      // Only write the major version.
      extractVersionTemplate: '^(?<version>\\d+)',
    },
  ],
}


================================================
FILE: .github/workflows/.java-version
================================================
26


================================================
FILE: .github/workflows/build.yaml
================================================
name: build

on:
  pull_request: {}
  workflow_dispatch: {}
  push:
    branches:
      - 'trunk'
    tags-ignore:
      - '**'

jobs:
  build:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v6
      - uses: actions/setup-java@v5
        with:
          distribution: 'zulu'
          java-version-file: .github/workflows/.java-version
      - uses: gradle/actions/setup-gradle@v6

      - run: ./gradlew build

      - run: ./gradlew publishToMavenCentral
        if: ${{ github.ref == 'refs/heads/trunk' && github.repository == 'JakeWharton/RxWindowIfChanged' }}
        env:
          ORG_GRADLE_PROJECT_mavenCentralUsername: ${{ secrets.SONATYPE_CENTRAL_USERNAME }}
          ORG_GRADLE_PROJECT_mavenCentralPassword: ${{ secrets.SONATYPE_CENTRAL_PASSWORD }}
          ORG_GRADLE_PROJECT_signingInMemoryKey: ${{ secrets.GPG_SECRET_KEY }}


================================================
FILE: .github/workflows/release.yaml
================================================
name: release

on:
  push:
    tags:
      - '**'

jobs:
  release:
    runs-on: ubuntu-latest
    permissions:
      contents: write
    steps:
      - uses: actions/checkout@v6
      - uses: actions/setup-java@v5
        with:
          distribution: 'zulu'
          java-version-file: .github/workflows/.java-version
      - uses: gradle/actions/setup-gradle@v6

      - run: ./gradlew publishToMavenCentral
        env:
          ORG_GRADLE_PROJECT_mavenCentralUsername: ${{ secrets.SONATYPE_CENTRAL_USERNAME }}
          ORG_GRADLE_PROJECT_mavenCentralPassword: ${{ secrets.SONATYPE_CENTRAL_PASSWORD }}
          ORG_GRADLE_PROJECT_signingInMemoryKey: ${{ secrets.GPG_SECRET_KEY }}

      - name: Extract release notes
        id: extract-release-notes
        uses: ffurrer2/extract-release-notes@v3
        with:
          release_notes_file: RELEASE_NOTES.md

      - name: Create GitHub release
        run: gh release create ${{ github.ref_name }} --notes-file RELEASE_NOTES.md
        env:
          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}


================================================
FILE: .gitignore
================================================
# Gradle
.gradle
build

# IntelliJ IDEA
.idea

# Kotlin
.kotlin


================================================
FILE: CHANGELOG.md
================================================
# Change Log

## Unreleased

Minimum-supported Java version is now 1.8.


## Version 1.0.0 *(2016-12-17)*

Initial release.


================================================
FILE: LICENSE.txt
================================================

                                 Apache License
                           Version 2.0, January 2004
                        http://www.apache.org/licenses/

   TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION

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   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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================================================
FILE: README.md
================================================
# RxJava Window If Changed

The `WindowIfChanged` operator for RxJava 2 divides an `Observable` that emits items into an
`Observable` that emits `Observables`, each one of which emits some subset of the items from the
original source. The items in each inner `Observable` all have a common "key" based on a key
selector function. A new inner `Observable` is emitted and the previous inner `Observable`
completes each time the key changes from the previous item.

![marble diagram](marbles.png)

```java
Observable<Actions> actions = //...

Observable<GroupedObservable<String, Action>> targetedActions =
    WindowIfChanged.create(actions, action -> action.target);
```


## Download

Gradle:
```kotlin
implementation("com.jakewharton.rx:window-if-changed:1.0.0")
```
Maven:
```xml
<dependency>
  <groupId>com.jakewharton.rx</groupId>
  <artifactId>window-if-changed</artifactId>
  <version>1.0.0</version>
</dependency>
```

If you use Kotlin, a package with an extension method for `Observable` is provided. Replace the
`window-if-changed` artifact ID above with `window-if-changed-kotlin`.

Snapshots of the development version are available in [Sonatype's `snapshots` repository][snap].


## License

    Copyright 2016 Jake Wharton

    Licensed under the Apache License, Version 2.0 (the "License");
    you may not use this file except in compliance with the License.
    You may obtain a copy of the License at

       http://www.apache.org/licenses/LICENSE-2.0

    Unless required by applicable law or agreed to in writing, software
    distributed under the License is distributed on an "AS IS" BASIS,
    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    See the License for the specific language governing permissions and
    limitations under the License.



 [snap]: https://oss.sonatype.org/content/repositories/snapshots/


================================================
FILE: build.gradle
================================================
buildscript {
  repositories {
    mavenCentral()
  }
  dependencies {
    classpath libs.kotlinPlugin
    classpath libs.mavenPublishPlugin
  }
}

subprojects {
  repositories {
    mavenCentral()
  }

  tasks.withType(JavaCompile).configureEach { task ->
    task.sourceCompatibility = '1.8'
    task.targetCompatibility = '1.8'
  }
  tasks.withType(org.jetbrains.kotlin.gradle.tasks.KotlinJvmCompile).configureEach { task ->
    task.kotlinOptions {
      jvmTarget = '1.8'
    }
  }
}


================================================
FILE: gradle/libs.versions.toml
================================================
[libraries]
kotlinPlugin = "org.jetbrains.kotlin:kotlin-gradle-plugin:2.3.20"
mavenPublishPlugin = "com.vanniktech:gradle-maven-publish-plugin:0.36.0"

rxjava2 = "io.reactivex.rxjava2:rxjava:2.2.21"

junit = "junit:junit:4.13.2"


================================================
FILE: gradle/wrapper/gradle-wrapper.properties
================================================
distributionBase=GRADLE_USER_HOME
distributionPath=wrapper/dists
distributionUrl=https\://services.gradle.org/distributions/gradle-9.4.1-bin.zip
networkTimeout=10000
validateDistributionUrl=true
zipStoreBase=GRADLE_USER_HOME
zipStorePath=wrapper/dists


================================================
FILE: gradle.properties
================================================
GROUP=com.jakewharton.rx
VERSION_NAME=1.0.1-SNAPSHOT

mavenCentralPublishing=true
mavenCentralAutomaticPublishing=true
signAllPublications=true

POM_DESCRIPTION=An RxJava operator which splits an observable into windows using a key selector. 

POM_URL=https://github.com/JakeWharton/RxWindowIfChanged/
POM_SCM_URL=https://github.com/JakeWharton/RxWindowIfChanged/
POM_SCM_CONNECTION=scm:git:git://github.com/JakeWharton/RxWindowIfChanged.git
POM_SCM_DEV_CONNECTION=scm:git:ssh://git@github.com/JakeWharton/RxWindowIfChanged.git

POM_LICENCE_NAME=The Apache Software License, Version 2.0
POM_LICENCE_URL=http://www.apache.org/licenses/LICENSE-2.0.txt
POM_LICENCE_DIST=repo

POM_DEVELOPER_ID=jakewharton
POM_DEVELOPER_NAME=Jake Wharton
POM_DEVELOPER_URL=https://github.com/JakeWharton/

org.gradle.caching=true
org.gradle.jvmargs=-Xmx4g -Dfile.encoding=UTF-8
org.gradle.parallel=true


================================================
FILE: gradlew
================================================
#!/bin/sh

#
# Copyright © 2015 the original authors.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#      https://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#
# SPDX-License-Identifier: Apache-2.0
#

##############################################################################
#
#   Gradle start up script for POSIX generated by Gradle.
#
#   Important for running:
#
#   (1) You need a POSIX-compliant shell to run this script. If your /bin/sh is
#       noncompliant, but you have some other compliant shell such as ksh or
#       bash, then to run this script, type that shell name before the whole
#       command line, like:
#
#           ksh Gradle
#
#       Busybox and similar reduced shells will NOT work, because this script
#       requires all of these POSIX shell features:
#         * functions;
#         * expansions «$var», «${var}», «${var:-default}», «${var+SET}»,
#           «${var#prefix}», «${var%suffix}», and «$( cmd )»;
#         * compound commands having a testable exit status, especially «case»;
#         * various built-in commands including «command», «set», and «ulimit».
#
#   Important for patching:
#
#   (2) This script targets any POSIX shell, so it avoids extensions provided
#       by Bash, Ksh, etc; in particular arrays are avoided.
#
#       The "traditional" practice of packing multiple parameters into a
#       space-separated string is a well documented source of bugs and security
#       problems, so this is (mostly) avoided, by progressively accumulating
#       options in "$@", and eventually passing that to Java.
#
#       Where the inherited environment variables (DEFAULT_JVM_OPTS, JAVA_OPTS,
#       and GRADLE_OPTS) rely on word-splitting, this is performed explicitly;
#       see the in-line comments for details.
#
#       There are tweaks for specific operating systems such as AIX, CygWin,
#       Darwin, MinGW, and NonStop.
#
#   (3) This script is generated from the Groovy template
#       https://github.com/gradle/gradle/blob/2d6327017519d23b96af35865dc997fcb544fb40/platforms/jvm/plugins-application/src/main/resources/org/gradle/api/internal/plugins/unixStartScript.txt
#       within the Gradle project.
#
#       You can find Gradle at https://github.com/gradle/gradle/.
#
##############################################################################

# Attempt to set APP_HOME

# Resolve links: $0 may be a link
app_path=$0

# Need this for daisy-chained symlinks.
while
    APP_HOME=${app_path%"${app_path##*/}"}  # leaves a trailing /; empty if no leading path
    [ -h "$app_path" ]
do
    ls=$( ls -ld "$app_path" )
    link=${ls#*' -> '}
    case $link in             #(
      /*)   app_path=$link ;; #(
      *)    app_path=$APP_HOME$link ;;
    esac
done

# This is normally unused
# shellcheck disable=SC2034
APP_BASE_NAME=${0##*/}
# Discard cd standard output in case $CDPATH is set (https://github.com/gradle/gradle/issues/25036)
APP_HOME=$( cd -P "${APP_HOME:-./}" > /dev/null && printf '%s\n' "$PWD" ) || exit

# Use the maximum available, or set MAX_FD != -1 to use that value.
MAX_FD=maximum

warn () {
    echo "$*"
} >&2

die () {
    echo
    echo "$*"
    echo
    exit 1
} >&2

# OS specific support (must be 'true' or 'false').
cygwin=false
msys=false
darwin=false
nonstop=false
case "$( uname )" in                #(
  CYGWIN* )         cygwin=true  ;; #(
  Darwin* )         darwin=true  ;; #(
  MSYS* | MINGW* )  msys=true    ;; #(
  NONSTOP* )        nonstop=true ;;
esac



# Determine the Java command to use to start the JVM.
if [ -n "$JAVA_HOME" ] ; then
    if [ -x "$JAVA_HOME/jre/sh/java" ] ; then
        # IBM's JDK on AIX uses strange locations for the executables
        JAVACMD=$JAVA_HOME/jre/sh/java
    else
        JAVACMD=$JAVA_HOME/bin/java
    fi
    if [ ! -x "$JAVACMD" ] ; then
        die "ERROR: JAVA_HOME is set to an invalid directory: $JAVA_HOME

Please set the JAVA_HOME variable in your environment to match the
location of your Java installation."
    fi
else
    JAVACMD=java
    if ! command -v java >/dev/null 2>&1
    then
        die "ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.

Please set the JAVA_HOME variable in your environment to match the
location of your Java installation."
    fi
fi

# Increase the maximum file descriptors if we can.
if ! "$cygwin" && ! "$darwin" && ! "$nonstop" ; then
    case $MAX_FD in #(
      max*)
        # In POSIX sh, ulimit -H is undefined. That's why the result is checked to see if it worked.
        # shellcheck disable=SC2039,SC3045
        MAX_FD=$( ulimit -H -n ) ||
            warn "Could not query maximum file descriptor limit"
    esac
    case $MAX_FD in  #(
      '' | soft) :;; #(
      *)
        # In POSIX sh, ulimit -n is undefined. That's why the result is checked to see if it worked.
        # shellcheck disable=SC2039,SC3045
        ulimit -n "$MAX_FD" ||
            warn "Could not set maximum file descriptor limit to $MAX_FD"
    esac
fi

# Collect all arguments for the java command, stacking in reverse order:
#   * args from the command line
#   * the main class name
#   * -classpath
#   * -D...appname settings
#   * --module-path (only if needed)
#   * DEFAULT_JVM_OPTS, JAVA_OPTS, and GRADLE_OPTS environment variables.

# For Cygwin or MSYS, switch paths to Windows format before running java
if "$cygwin" || "$msys" ; then
    APP_HOME=$( cygpath --path --mixed "$APP_HOME" )

    JAVACMD=$( cygpath --unix "$JAVACMD" )

    # Now convert the arguments - kludge to limit ourselves to /bin/sh
    for arg do
        if
            case $arg in                                #(
              -*)   false ;;                            # don't mess with options #(
              /?*)  t=${arg#/} t=/${t%%/*}              # looks like a POSIX filepath
                    [ -e "$t" ] ;;                      #(
              *)    false ;;
            esac
        then
            arg=$( cygpath --path --ignore --mixed "$arg" )
        fi
        # Roll the args list around exactly as many times as the number of
        # args, so each arg winds up back in the position where it started, but
        # possibly modified.
        #
        # NB: a `for` loop captures its iteration list before it begins, so
        # changing the positional parameters here affects neither the number of
        # iterations, nor the values presented in `arg`.
        shift                   # remove old arg
        set -- "$@" "$arg"      # push replacement arg
    done
fi


# Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
DEFAULT_JVM_OPTS='"-Xmx64m" "-Xms64m"'

# Collect all arguments for the java command:
#   * DEFAULT_JVM_OPTS, JAVA_OPTS, and optsEnvironmentVar are not allowed to contain shell fragments,
#     and any embedded shellness will be escaped.
#   * For example: A user cannot expect ${Hostname} to be expanded, as it is an environment variable and will be
#     treated as '${Hostname}' itself on the command line.

set -- \
        "-Dorg.gradle.appname=$APP_BASE_NAME" \
        -jar "$APP_HOME/gradle/wrapper/gradle-wrapper.jar" \
        "$@"

# Stop when "xargs" is not available.
if ! command -v xargs >/dev/null 2>&1
then
    die "xargs is not available"
fi

# Use "xargs" to parse quoted args.
#
# With -n1 it outputs one arg per line, with the quotes and backslashes removed.
#
# In Bash we could simply go:
#
#   readarray ARGS < <( xargs -n1 <<<"$var" ) &&
#   set -- "${ARGS[@]}" "$@"
#
# but POSIX shell has neither arrays nor command substitution, so instead we
# post-process each arg (as a line of input to sed) to backslash-escape any
# character that might be a shell metacharacter, then use eval to reverse
# that process (while maintaining the separation between arguments), and wrap
# the whole thing up as a single "set" statement.
#
# This will of course break if any of these variables contains a newline or
# an unmatched quote.
#

eval "set -- $(
        printf '%s\n' "$DEFAULT_JVM_OPTS $JAVA_OPTS $GRADLE_OPTS" |
        xargs -n1 |
        sed ' s~[^-[:alnum:]+,./:=@_]~\\&~g; ' |
        tr '\n' ' '
    )" '"$@"'

exec "$JAVACMD" "$@"


================================================
FILE: gradlew.bat
================================================
@rem
@rem Copyright 2015 the original author or authors.
@rem
@rem Licensed under the Apache License, Version 2.0 (the "License");
@rem you may not use this file except in compliance with the License.
@rem You may obtain a copy of the License at
@rem
@rem      https://www.apache.org/licenses/LICENSE-2.0
@rem
@rem Unless required by applicable law or agreed to in writing, software
@rem distributed under the License is distributed on an "AS IS" BASIS,
@rem WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
@rem See the License for the specific language governing permissions and
@rem limitations under the License.
@rem
@rem SPDX-License-Identifier: Apache-2.0
@rem

@if "%DEBUG%"=="" @echo off
@rem ##########################################################################
@rem
@rem  Gradle startup script for Windows
@rem
@rem ##########################################################################

@rem Set local scope for the variables with windows NT shell
if "%OS%"=="Windows_NT" setlocal

set DIRNAME=%~dp0
if "%DIRNAME%"=="" set DIRNAME=.
@rem This is normally unused
set APP_BASE_NAME=%~n0
set APP_HOME=%DIRNAME%

@rem Resolve any "." and ".." in APP_HOME to make it shorter.
for %%i in ("%APP_HOME%") do set APP_HOME=%%~fi

@rem Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
set DEFAULT_JVM_OPTS="-Xmx64m" "-Xms64m"

@rem Find java.exe
if defined JAVA_HOME goto findJavaFromJavaHome

set JAVA_EXE=java.exe
%JAVA_EXE% -version >NUL 2>&1
if %ERRORLEVEL% equ 0 goto execute

echo. 1>&2
echo ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH. 1>&2
echo. 1>&2
echo Please set the JAVA_HOME variable in your environment to match the 1>&2
echo location of your Java installation. 1>&2

goto fail

:findJavaFromJavaHome
set JAVA_HOME=%JAVA_HOME:"=%
set JAVA_EXE=%JAVA_HOME%/bin/java.exe

if exist "%JAVA_EXE%" goto execute

echo. 1>&2
echo ERROR: JAVA_HOME is set to an invalid directory: %JAVA_HOME% 1>&2
echo. 1>&2
echo Please set the JAVA_HOME variable in your environment to match the 1>&2
echo location of your Java installation. 1>&2

goto fail

:execute
@rem Setup the command line



@rem Execute Gradle
"%JAVA_EXE%" %DEFAULT_JVM_OPTS% %JAVA_OPTS% %GRADLE_OPTS% "-Dorg.gradle.appname=%APP_BASE_NAME%" -jar "%APP_HOME%\gradle\wrapper\gradle-wrapper.jar" %*

:end
@rem End local scope for the variables with windows NT shell
if %ERRORLEVEL% equ 0 goto mainEnd

:fail
rem Set variable GRADLE_EXIT_CONSOLE if you need the _script_ return code instead of
rem the _cmd.exe /c_ return code!
set EXIT_CODE=%ERRORLEVEL%
if %EXIT_CODE% equ 0 set EXIT_CODE=1
if not ""=="%GRADLE_EXIT_CONSOLE%" exit %EXIT_CODE%
exit /b %EXIT_CODE%

:mainEnd
if "%OS%"=="Windows_NT" endlocal

:omega


================================================
FILE: settings.gradle
================================================
rootProject.name = 'RxWindowIfChanged'

include ':window-if-changed'
include ':window-if-changed-kotlin'

enableFeaturePreview('TYPESAFE_PROJECT_ACCESSORS')


================================================
FILE: window-if-changed/build.gradle
================================================
apply plugin: 'java-library'
apply plugin: 'com.vanniktech.maven.publish'

dependencies {
  api libs.rxjava2

  testImplementation libs.junit
}


================================================
FILE: window-if-changed/gradle.properties
================================================
POM_NAME=RxJava Window If Changed


================================================
FILE: window-if-changed/src/main/java/com/jakewharton/rx/WindowGroupedObservable.java
================================================
/*
 * Copyright (C) 2016 Jake Wharton
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.jakewharton.rx;

import io.reactivex.Observer;
import io.reactivex.observables.GroupedObservable;
import io.reactivex.subjects.UnicastSubject;

final class WindowGroupedObservable<K, T> extends GroupedObservable<K, T> {
  final UnicastSubject<T> state = UnicastSubject.create();

  WindowGroupedObservable(K key) {
    super(key);
  }

  @Override protected void subscribeActual(Observer<? super T> observer) {
    state.subscribe(observer);
  }
}


================================================
FILE: window-if-changed/src/main/java/com/jakewharton/rx/WindowIfChanged.java
================================================
/*
 * Copyright (C) 2016 Jake Wharton
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.jakewharton.rx;

import io.reactivex.Observable;
import io.reactivex.functions.Function;
import io.reactivex.observables.GroupedObservable;

/**
 * Divides an {@link Observable} that emits items into an {@link Observable} that emits
 * {@link Observable Observables}, each one of which emits some subset of the items from the
 * original source. The items in each inner {@link Observable} all have a common "key" based on a
 * key selector function. A new inner {@link Observable} is emitted and the previous inner
 * {@link Observable} completes each time the key changes from the previous item.
 */
public final class WindowIfChanged {
  public static <T, K> Observable<GroupedObservable<K, T>> create(Observable<T> upstream,
      Function<? super T, ? extends K> keySelector) {
    return new WindowIfChangedObservable<>(upstream, keySelector);
  }

  private WindowIfChanged() {
    throw new AssertionError("No instances.");
  }
}


================================================
FILE: window-if-changed/src/main/java/com/jakewharton/rx/WindowIfChangedObservable.java
================================================
/*
 * Copyright (C) 2016 Jake Wharton
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.jakewharton.rx;

import io.reactivex.Observable;
import io.reactivex.Observer;
import io.reactivex.functions.Function;
import io.reactivex.observables.GroupedObservable;

final class WindowIfChangedObservable<T, K> extends Observable<GroupedObservable<K, T>> {
  private final Observable<T> upstream;
  private final Function<? super T, ? extends K> keySelector;

  WindowIfChangedObservable(Observable<T> upstream, Function<? super T, ? extends K> keySelector) {
    this.upstream = upstream;
    this.keySelector = keySelector;
  }

  @Override protected void subscribeActual(Observer<? super GroupedObservable<K, T>> observer) {
    upstream.subscribe(new WindowIfChangedObserver<>(keySelector, observer));
  }
}


================================================
FILE: window-if-changed/src/main/java/com/jakewharton/rx/WindowIfChangedObserver.java
================================================
/*
 * Copyright (C) 2016 Jake Wharton
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.jakewharton.rx;

import io.reactivex.Observer;
import io.reactivex.disposables.Disposable;
import io.reactivex.functions.Function;
import io.reactivex.observables.GroupedObservable;

final class WindowIfChangedObserver<T, K> implements Observer<T> {
  private static final Object NOT_SET = new Object();

  private final Function<? super T, ? extends K> keySelector;
  private final Observer<? super GroupedObservable<K, T>> observer;

  @SuppressWarnings("unchecked") // Safe because of erasure.
  private K key = (K) NOT_SET;
  private WindowGroupedObservable<K, T> window;

  WindowIfChangedObserver(Function<? super T, ? extends K> keySelector,
      Observer<? super GroupedObservable<K, T>> observer) {
    this.keySelector = keySelector;
    this.observer = observer;
  }

  @Override public void onSubscribe(Disposable d) {
    observer.onSubscribe(d);
  }

  @Override public void onNext(T value) {
    K nextKey;
    try {
      nextKey = keySelector.apply(value);
    } catch (Exception e) {
      onError(e);
      return;
    }

    K key = this.key;
    WindowGroupedObservable<K, T> window = this.window;

    if (key != null ? !key.equals(nextKey) : nextKey != null) {
      if (window != null) {
        window.state.onComplete();
      }
      this.key = nextKey;
      this.window = window = new WindowGroupedObservable<>(nextKey);
      observer.onNext(window);
    }
    window.state.onNext(value);
  }

  @Override public void onError(Throwable e) {
    WindowGroupedObservable<K, T> window = this.window;
    if (window != null) {
      window.state.onComplete();

      this.key = null;
      this.window = null;
    }

    observer.onError(e);
  }

  @Override public void onComplete() {
    WindowGroupedObservable<K, T> window = this.window;
    if (window != null) {
      window.state.onComplete();

      this.key = null;
      this.window = null;
    }

    observer.onComplete();
  }
}


================================================
FILE: window-if-changed/src/test/java/com/jakewharton/rx/Message.java
================================================
package com.jakewharton.rx;

final class Message {
  final String user;
  final String message;

  Message(String user, String message) {
    this.user = user;
    this.message = message;
  }

  @Override public String toString() {
    return user + " " + message;
  }
}


================================================
FILE: window-if-changed/src/test/java/com/jakewharton/rx/WindowIfChangedTest.java
================================================
package com.jakewharton.rx;

import io.reactivex.Notification;
import io.reactivex.Observable;
import io.reactivex.functions.Function;
import io.reactivex.observables.GroupedObservable;
import java.util.concurrent.atomic.AtomicInteger;
import org.junit.Test;

public final class WindowIfChangedTest {
  private final Function<Message, String> userSelector = new Function<Message, String>() {
    @Override public String apply(Message message) {
      return message.user;
    }
  };

  @Test public void splits() {
    Observable<Message> messages = Observable.just( //
        new Message("Bob", "Hello"), //
        new Message("Bob", "World"), //
        new Message("Alice", "Hey"), //
        new Message("Bob", "What's"), //
        new Message("Bob", "Up?"), //
        new Message("Eve", "Hey") //
    );
    final AtomicInteger seen = new AtomicInteger();
    WindowIfChanged.create(messages, userSelector)
        .switchMap(
            new Function<GroupedObservable<String, Message>, Observable<Notification<String>>>() {
              @Override public Observable<Notification<String>> apply(
                  GroupedObservable<String, Message> group) {
                final int count = seen.incrementAndGet();
                return group.map(new Function<Message, String>() {
                  @Override public String apply(Message message) throws Exception {
                    return count + " " + message;
                  }
                }).materialize();
              }
            })
        .test()
        .assertValues( //
            Notification.createOnNext("1 Bob Hello"), //
            Notification.createOnNext("1 Bob World"), //
            Notification.<String>createOnComplete(), //
            Notification.createOnNext("2 Alice Hey"), //
            Notification.<String>createOnComplete(), //
            Notification.createOnNext("3 Bob What's"), //
            Notification.createOnNext("3 Bob Up?"), //
            Notification.<String>createOnComplete(), //
            Notification.createOnNext("4 Eve Hey"), //
            Notification.<String>createOnComplete()); //
  }

  @Test public void completeCompletesInner() {
    Observable<Message> messages = Observable.just(new Message("Bob", "Hello"));
    final AtomicInteger seen = new AtomicInteger();
    WindowIfChanged.create(messages, userSelector)
        .switchMap(
            new Function<GroupedObservable<String, Message>, Observable<Notification<String>>>() {
              @Override public Observable<Notification<String>> apply(
                  GroupedObservable<String, Message> group) {
                final int count = seen.incrementAndGet();
                return group.map(new Function<Message, String>() {
                  @Override public String apply(Message message) throws Exception {
                    return count + " " + message;
                  }
                }).materialize();
              }
            })
        .test()
        .assertValues( //
            Notification.createOnNext("1 Bob Hello"), //
            Notification.<String>createOnComplete()) //
        .assertComplete();
  }

  @Test public void errorCompletesInner() {
    RuntimeException error = new RuntimeException("boom!");
    Observable<Message> messages = Observable.just( //
        Notification.createOnNext(new Message("Bob", "Hello")),
        Notification.createOnError(error)
    ).dematerialize();
    final AtomicInteger seen = new AtomicInteger();
    WindowIfChanged.create(messages, userSelector)
        .switchMap(
            new Function<GroupedObservable<String, Message>, Observable<Notification<String>>>() {
              @Override public Observable<Notification<String>> apply(
                  GroupedObservable<String, Message> group) {
                final int count = seen.incrementAndGet();
                return group.map(new Function<Message, String>() {
                  @Override public String apply(Message message) throws Exception {
                    return count + " " + message;
                  }
                }).materialize();
              }
            })
        .test()
        .assertValues( //
            Notification.createOnNext("1 Bob Hello"), //
            Notification.<String>createOnComplete()) //
        .assertError(error);
  }
}


================================================
FILE: window-if-changed-kotlin/build.gradle
================================================
apply plugin: 'org.jetbrains.kotlin.jvm'
apply plugin: 'com.vanniktech.maven.publish'

dependencies {
  api projects.windowIfChanged

  testImplementation libs.junit
}


================================================
FILE: window-if-changed-kotlin/gradle.properties
================================================
POM_NAME=RxJava Window If Changed (Kotlin Extensions)


================================================
FILE: window-if-changed-kotlin/src/main/kotlin/com/jakewharton/rx/WindowIfChanged.kt
================================================
/*
 * Copyright 2016 Jake Wharton
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *    http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.jakewharton.rx

import io.reactivex.Observable

/**
 * TODO
 */
@Suppress("NOTHING_TO_INLINE") // Extension function is for chaining convenience only.
inline fun <T, K> Observable<T>.windowIfChanged(noinline keySelector: (T) -> K)
    = WindowIfChanged.create(this, keySelector)


================================================
FILE: window-if-changed-kotlin/src/test/kotlin/com/jakewharton/rx/WindowIfChangedTest.kt
================================================
/*
 * Copyright 2016 Jake Wharton
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *    http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.jakewharton.rx

import io.reactivex.Observable
import org.junit.Assert.assertNotNull
import org.junit.Test

class WindowIfChangedTest {
  @Test fun observableExtensionMethodWorks() {
    val o = Observable.never<String>().windowIfChanged { it }
    assertNotNull(o)
  }
}