Gradle plugin extension and enum types

Question

I'm creating a gradle plugin with a custom extension :

project.extensions.create("myExtension", MyExtension.class)

Where MyExtension looks like :

class MyExtension {
  Set<MyEnum> mySet;
  MyEnum myEnum;
}

The problem is that I'm not able to set mySet inside my build.gradle (with standard DSL) :

myExtension {
    myEnum = 'enumField1'
    mySet = ['enumField1']
}

I get a java.lang.String cannot be cast to MyEnum only for mySet, the String to enum convertion works well for myEnum... So I'm gessing if it is possible for a Collection of enum type ? Is there a solution ?

Answer 1

It works for myEnum because Groovy automatically converts strings assigned to enum properties. To make the same work for mySet, you'll have to add a method to the extension that accepts a string, converts it to the corresponding enum value (a simple cast will do in Groovy), and adds the latter to the set. You'll also have to initialize the set.

Answer 2

I get it to work by using a simple java array instead of generic Collection<T> :

class MyExtension {
  // string convertion doesn't work
  Set<MyEnum> mySet;
  // string convertion works fine
  MyEnum[] myArray;
  MyEnum myEnum;
}

The extension can then be used as expected :

myExtension {
    myEnum = 'enumField1'
    mySet = ['enumField1']
}

hope it helps...