reject

Dependency Rejection for Java and Android

"Sometimes you have something that you don't want called. So you can simply annotate it with @Reject"

Dependency Rejection

Inspired by a comedy talk from Chet Haase and Romain Guy at droidcon London 2017 where they presented a "new programming language". The Functional And Reactive Turing-complete language.

The language comes with lots of useful features. One of them is dependency rejection. Such a helpful new feature shouldn't be limited to this particular language. reject ports the dependency rejection functionality and the @Reject annotation to Java and Android to make your projects clearer, simpler, and more productive.

reject gives you access to the @Reject annotation in your Java or Android project. It tells the compiler to reject certain things and it lets you know accordingly.

@Reject
public MyClass() { }

> gradle run
No.

Usage

Import the plugin

buildscript {
  repositories {
    jcenter()
  }
  dependencies {
    classpath "com.mtramin.reject:gradle-plugin:<reject-version>"
  }
}

apply plugin: 'reject'

Rejecting things

Simply annotate methods or constructors with the @Reject annotation to reject those.

public MyClass {

    @Reject
    public MyClass() {
        System.out.println("Hello World")
    }

    @Reject
    private void something() {
        ...
    }
}

The compiler will then properly reject those classes/methods by simply saying "No.".

Samples

The samples showcase how to import reject and how to use it in Java and Android projects.

Java Sample

Run the Java sample with the following command and watch the output in the command line:

./gradlew :samples:sample-java:run

Android Sample

Build and run the sample application on an Android emulator or device and watch the logcat for the results.

Credits

• Thanks to Chet Haase and Romain Guy for their comedy talk at droidcon London 2017. You can watch it here.
• eveoh: For the Gradle AspectJ Plugin