Simple Composition

This projects provides an annotation processor to provide simple composition / mixins / delegates using java 8 default interface

The idea

The idea using default interfaces in oder to implement mixings was inspired by http://hannesdorfmann.com/android/java-mixins

Interfaces containing default methods linking / delegating the to an instance hosted inside the interface it self. This allows to integrate multiple functional objects (mixins) into one single class.

How it is done

Quite simple just create one class which will be enriched by mixed in functionality and one or more classes to encapsulate these kind of functionality

How to include

As project currenlty not published to major maven repos please add:

repositories {
   maven { url "https://dl.bintray.com/wgr1984/SimpleComposition"}
}

and the following two dependecies:

annotationProcessor "de.wr.simpledataclasses:simpleCompositionProcessor:0.1"
provided "de.wr.simpledataclasses:libSimpleComposition:0.1

Simple Sample

public class SideObject1 {
    private String name;

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }
}

@Include(SideObject1.class)
public class MainObject implements SideObject1Composition {
    public void printName() {
        System.out.println(getName());
    }
}

This will expose the functionality of SideObject1 into MainObject by using the @Include annotation and implement the generated interface <ObjectName>Composition