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copper

(★ 315)

A content provider wrapper for reactive queries

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최종 버전 다운로드 (.zip)

- - .java-version
  - build.yaml
  - gradle-wrapper.yaml
  - release.yaml
- renovate.json5
- build.gradle
- gradle.properties
- build.gradle
- gradle.properties
- build.gradle
- gradle.properties
- build.gradle
- gradle.properties
- build.gradle
- - gradle-wrapper.jar
  - gradle-wrapper.properties
- libs.versions.toml
.editorconfig
.gitignore
build.gradle
CHANGELOG.md
gradle.properties
gradlew
gradlew.bat
LICENSE.txt
README.md
RELEASING.md
settings.gradle

# 설치 가이드

1. 코드 내려받기

git clone https://github.com/cashapp/copper

깃허브에서 프로젝트 코드 전체를 내 컴퓨터로 내려받습니다.

cd copper

방금 내려받은 프로젝트 폴더 안으로 이동합니다.

2. Gradle (Java/Kotlin)

보통 추천

사전 준비물

Git GitHub에서 프로젝트 코드를 내려받으려면 필요합니다.
JDK (Java) Java/Kotlin 프로젝트를 빌드/실행하려면 필요합니다.
Gradle 레포에 포함된 gradlew(Gradle Wrapper)를 쓰면 Gradle을 따로 설치할 필요가 없습니다.

./gradlew build

Gradle로 빌드를 진행합니다.

✅ BUILD SUCCESSFUL 메시지가 뜨면 성공입니다. build/ 폴더에 결과물이 생성됩니다.

// repository documentation

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# Copper

A content provider wrapper for reactive queries with Kotlin coroutines `Flow` or
RxJava `Observable`.

```kotlin
contentResolver.observeQuery(uri).collect { query ->
  // ...
}
```

## Download

```groovy
// Kotlin coroutines
implementation 'app.cash.copper:copper-flow:1.0.0'

// RxJava 3
implementation 'app.cash.copper:copper-rx3:1.0.0'

// RxJava 2
implementation 'app.cash.copper:copper-rx2:1.0.0'
```

<details>
<summary>Snapshots of the development version are available in the Central Portal Snapshots repository.</summary>
<p>

```groovy
repositories {
  maven {
    url 'https://central.sonatype.com/repository/maven-snapshots/'
  }
}
dependencies {
  testImplementation 'app.cash.copper:copper-flow:1.1.0-SNAPSHOT'
  testImplementation 'app.cash.copper:copper-rx2:1.1.0-SNAPSHOT'
  testImplementation 'app.cash.copper:copper-rx3:1.1.0-SNAPSHOT'
}
```

</p>
</details>

## Usage

Given a [`ContentResolver`](https://developer.android.com/reference/android/content/ContentResolver),
change your calls from `query` to `observeQuery` for a reactive version.

```kotlin
contentResolver.observeQuery(uri).collect { query ->
  query.run()?.use { cursor ->
    // ...
  }
}
```

Unlike `query`, `observeQuery` returns a `Query` object that you must call `run()` on in order to
execute the underlying query for a `Cursor`. This ensures that intermediate operators which cache
values do not leak resources and that consumers have access to the full lifetime of the cursor.

Instead of dealing with a `Cursor` directly, operators are provided which help convert the
contained values into semantic types:

```kotlin
contentResolver.observeQuery(uri)
  .mapToOne { cursor ->
    Employee(cursor.getString(0), cursor.getString(1))
  }
  .collect {
    println(it)
  }
```
```
Employee(id=bob, name=Bob Bobberson)
```

The `mapToOne` operator takes a query which returns a single row and invokes the lambda to map the
cursor to your desired type. If your query returns zero or one rows, the coroutine artifact has a
`mapToOneOrNull` operator and the RxJava artifacts have a `mapToOptional` operator.

If your query returns a list, call `mapToList` with the same lambda:

```kotlin
contentResolver.observeQuery(uri)
  .mapToList { cursor ->
    Employee(cursor.getString(0), cursor.getString(1))
  }
  .collect {
    println(it)
  }
```
```
[Employee(id=alice, name=Alice Alison), Employee(id=bob, name=Bob Bobberson)]
```

# License

Copyright 2015 Square, Inc.

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.

Note: This library was forked from [SQLBrite](https://github.com/square/sqlbrite).