Example of type-safe properties

MagnusProperty.groovy

@CompileStatic
abstract class MagnusProperty<T> {

  final String key;
  
  MagnusProperty(String key) {
    assert key : "No key provided!"
    this.key = key
  }

  abstract T fromString(String value);
  
}

class StringMagnusProperty extends MagnusProperty<String> {
  
  StringMagnusProperty(String key) {
    super(key);
  }

  String fromString(String value) {
    return value;
  }  
}

class MagnusProperties {
   static final StringMagnusProperty SOME_PROPERTY = new StringMagnusProperty("some.property");
   
   <T> T getProperty(MagnusProperty<T> property) {
      String value = /* fetch value from DB using property.key */
      return property.fromString(value);
   }
}