How to give access inside Groovy script to a field by adding getter for a field through an annotation

Question

I have a model class with fields inside:

public class Model1 {
  @Bind private int LL; 
  @Bind private  double[] twKI; 
  @Bind private  double[] twKS; 
  @Bind private  double[] twINW; 
  @Bind private  double[] twEKS; 
}

I created an annotation:

import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;

@Target(ElementType.FIELD)
@Retention(RetentionPolicy.RUNTIME) 

public @interface Bind {


}

Is it possible to define getter and setters for fields inside Model1 class without modyfing it so later on they will by available in groovy script?

Answer 1

Well you have multiple choices and you can choose whichever suits you better:

We have a model object: Model model = new Model()

1. Using getter and setters : Create getters and setter methods and then call the setter method: model.setLL(10)

2. Without getter and setters : Well in groovy/grails scope variables doesn't make much difference until you are overriding them for some specific purpose. So you can directly set the value using model.LL = 10

3. Using setProperty : model.setProperty('LL', 10)

4. Reflection way : before setting the field value, mark it as accessible.

Field field = Model.getDeclaredField("LL")
field.setAccessible(true)
field.set(model, 10)