On 29.02.2016 03:23, Gerald Wiltse wrote:
Is there a way for the Chameleon class to ever see that it has a
"lastColor" property?
class Chameleon{
String color = "green"
void printAllMyProperties(){
this.properties.each{println it}
}
}
trait ColorChanging {
String lastColor
def changeColor = {newcolor ->
lastColor = this.color
this.color = newcolor
}
}
in case of Chameleon implements ColorChanging the answer is yes. In case of
def mylizard = new Chameleon().withTraits(ColorChanging)
mylizard.changeColor(blue)
mylizard.printAllMyProperties()
mylizard.properties.each{println it}
... no. Here Chameleon does not know anything about the trait and the
trait isused like a facade around the object. For the same reason
mylizard is an instance of ColorChanging, but not of Chameleon anymore
It could probably made possible, if you change the meta class used for
the Chameleon object you proxy with the trait. But there is no such
implementation right now
bye Jochen
