optional-getter

Generating getter method with Optional as a return type by annotation using Groovy and AST transformations.

What is it?

Let's assume you have class like this:

class Foo {

    private String someField
}

And you want to have method Optional<String> getSomeFieldOptional()

Sounds like a boilerplate, huh?

Well, put @OptionalGetter on field and enjoy the magic of AST transformations :)

class Foo {
    @OptionalGetter
    private String someField
}

As of result of AST transformation you will have .class similar to:

public class Foo implements GroovyObject {
    private String someField;

    // generated constructor omitted 

    public Optional<String> getSomeFieldOptional() {
        CallSite[] var1 = $getCallSiteArray();
        return (Optional) ScriptBytecodeAdapter.castToType(var1[0].callStatic(Optional.class, this.someField), Optional.class);
    }
}

How to use?

1. Add to your build.gradle:

allprojects {
    repositories {
        maven { url 'https://jitpack.io' }
    }
}

2. Add dependency:

dependencies {
   implementation 'com.github.eugenelesnov:optional-getter:1.0'
}

What's next?

Well, there are plans...

1. Fixing possible bugs
2. IDE support. Of course, Intelij IDEA is a priority ;) For now, it works for Groovy only. There is no way (yet!) to use this library with Java because IDE won't let you use the method generated at the compile-time..