Returning Groovy class fields as a map

Question

I want to get a map of all the fields in a class (aka value object) in a generic way. The following works fine for me:

class Baz {
  String foo = "foo2"
  int bar = 2

  public Map asMap() {
    def map = [:] as HashMap
    this.class.getDeclaredFields().each {
      if (it.modifier == java.lang.reflect.Modifier.PRIVATE) {
        map.put(it.name, this[it.name])
      }
    }
    return map
  }
}

But this doesn't feel like the proper way. Is there a better approach?

Answer 1

Another alternative (very similar to Matt's) is to use the synthetic field property (which is set for default class properties, but not for your own defined props):

class Baz {
  String foo = "foo2"
  int bar = 2

  public Map asMap() {
    this.class.declaredFields.findAll { !it.synthetic }.collectEntries {
      [ (it.name):this."$it.name" ]
    }
  }
}

Answer 2

Here's one alternative:

class Baz {
  String foo = 'foo2'
  int bar = 2

  public Map asMap() {
    this.class.declaredFields.findAll { it.modifiers == java.lang.reflect.Modifier.PRIVATE }.
      collectEntries { [it.name, this[it.name]] }
  }
}

Basically, I'm finding just the fields with the modifiers value set to private and then collecting those as Map entries.