CODEWITHSUNDEEP
javagroovyclosuresdsl
WeSt
WeSt

Reputation: 2684

Groovy Closure not checking owner or delegate scope

I am writing a small Groovy DSL, which relies on Groovy Closures. I then run the DSL from a Java program by using GroovyShell and a DelegatingScript.

Code invoking the script from Java:

DelScript project = new DelScript ();

CompilerConfiguration cc = new CompilerConfiguration();
cc.setScriptBaseClass("groovy.util.DelegatingScript");
GroovyShell sh = new GroovyShell(Launcher.class.getClassLoader(), new Binding(), cc);

DelegatingScript script = (DelegatingScript) sh.parse(new File(path));
script.setDelegate(project);
script.run();

The instance of DelScript works as the this reference inside the script, e.g. any member or method not found in the script itself is searched in the instance of DelScript.

My script can include the following expressions: 

create (name: "test") {
    // this code can be used to initialize the 
    // object that is created here
    testProperty = "I'm an example"
}

The intention of this code is to create an object and then call the closure, which can be used to initialize it. As I said before, the create method resides in the DelScript instance, (which is what I want) and it looks like this:

def create(arguments, configClosure) {
    // create new object
    def x = new Impl(arguments)

    // use configClosure to init it
    configClosure.delegate = x
    configClosure()
}

Although I set the delegate of the configClosure, I get an error that testProperty is not a part of DelScript. I know that the DelScript instance is the this of the configClosure, since I created it in the DelScript scope, but I thought that the closure would check references in the order: this -> owner -> delegate. It never checks delegate in my case but raises an exception right after checking this.

Can anyone give me some feedback on what I am doing wrong?

Upvotes: 0

Views: 245

Answers (1)

tim_yates
tim_yates

Reputation: 171084

After the line

configClosure.delegate = x

Put

configClosure.resolveStrategy = Closure.DELEGATE_FIRST

Upvotes: 1

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