ClosureParamTest.groovy

package net.phly.groovy

import groovy.transform.CompileStatic
import groovy.transform.stc.ClosureParams
import groovy.transform.stc.FromAbstractTypeMethods
import groovy.transform.stc.SimpleType

@CompileStatic
class ClosureParamTest {

    abstract class Foo {
        abstract void firstSignature(int x, int y)
        abstract void secondSignature(String str)
    }

    static void doIt(@ClosureParams(value = SimpleType, options = ['java.lang.String']) Closure cl) {
        // ..
    }

    static void doSomething(@ClosureParams(value=FromAbstractTypeMethods, options=["Foo"]) Closure cl) {
        // ..
    }

    static void doSomethingDifferent(@ClosureParams(value=FromAbstractTypeMethods, options=["net.phly.groovy.ClosureParamTest.Foo"]) Closure cl) {
        // ..
    }

    public static void main(String[] args) {
        doIt { s -> s.toUpperCase() }                     //compiles

        doSomething { a, b -> a + b }                     //'works' but does not recognise a and b as int
        doSomething { s -> s.toUpperCase() }              //does not compile

        doSomethingDifferent { a, b -> a + b }            //'works' but does not recognise a and b as int
        doSomethingDifferent { s -> s.toUpperCase() }     //does not compile
    }

}