Delegating global functions to Java with Jython - scripting

Question

I would like to bind my functions implemented in Java into the global scope of a Jython interpreter instance (so I don't need to manually import them first in my scripts).
If this helps, I'm looking for a similar thing to Groovy's DelegatingScript, where you can set the delegate of the script body to a Java/Groovy object, so the objects functions are directly callable inside the DSL script.
Is there any way to achieve this?

Answer 1

Turned out this is rather easy to do.
You can put static functions into the Dsl class and those can be directly invoked inside the script.
Note: this is not exactly the same what Groovy does, because there you bind the local scope to an object rather than a class, but with some thinking this can be still very useful.
App.java
public final class App {
public static void main(String[] args) throws Exception {
try (PythonInterpreter py = new PythonInterpreter()) {
py.exec("from hu.company.jythontest.Dsl import *");
try (FileInputStream script = new FileInputStream("./etc/test.py")) {
py.execfile(script);
}
var blocks = py.get("blocks", List.class);
System.out.println(blocks.toString());
}
}
}
Dsl.java
public final class Dsl {
public static class Block {
private final String id;
public Block(String id) {
this.id = id;
}
public String getId() {
return id;
}
#Override
public String toString() {
return id;
}
}
}
test.py
blocks = [Block('%d' % i) for i in range(10)]
Output:
[0, 1, 2, 3, 4, 5, 6, 7, 8, 9]