Populating variables in a groovy script from a java program

Question

I know how to call Groovy code from Java code, but can you, while running Groovy script script.groovy, ask a Java program to populate its varabies?

// script.groovy
import static org.mydomain.WiseJavaProgram.*;
pleasePopulateMeWithVariables();
println numberOfLegs // 2
// We didn't declare numberOfLegs in our sript, the Java program set it for us.

I guess maybe for that script.groovy should pass its environment to the pleasePopulateMeWithVariables method, but I haven't found how to do that. Is this even possible?

The case where I want to use such behavior: I have script.groovy, and also an undefined number of groovy scripts of which Java program knows, but of which script.groovy doesn't know, and I want to add what is declared in them to script.groovy. Basically those additional scripts are data, for example descriptions of various products and their features. This is easy if you run a Java program that creates GroovyShell and evaluates in it data-scripts and then script.groovy, but for me it is necessary that we initially call script.groovy, not the Java program.

gvlasov · Accepted Answer · 2014-07-23 22:31:55Z

1

Just as usual, while asking the question I was one step behind the answer -__-

The "environment" I was searching for is the Script object itself, available from script.groovy simply as this. So:

// script.groovy
import static org.mydomain.WiseJavaProgram.*;
populateWithVariables(this);
println numberOfLegs // 2

// WiseJavaProgram.java
public class WiseJavaProgram {
  public static void populateWithVariables(Script script) {
    script.evaluate('numberOfLegs = 2');
    script.evaluate(new File("another.groovy"));
    script.evaluate(new File("yetAnother.groovy"));
  }
}

answered Jul 23, 2014 at 22:31

gvlasov

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