Exercise Runtime Metaprogrammings in Groovy Scripting groovy training telugu 48

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[Exercise] Runtime Metaprogramming

GroovyObject

Create a class and implement each of the following methods from the GroovyObject Interface

invokeMethod

getProperty

setProperty

Expando

Create an Expando Class

Add some properties and methods to it

Knowing that a class's metaclass is an expando to create your own class and add properties and methods to it.

Times Two

Add a new method to the Integer class called `timesTwo`

This method should be available to any instance of Integer

What is another approach that we can take to create this method that would be a little more controlled?

 

//Code

//Developer.groovy

class Developer{

String first

String last

String email

List languages

Developer(){

}

def invokeMethod(String name,Object args){

println "invokeMethod()called with args $args"

}

defgetProperty(String property){

println"getProperty called..."

metaClass.getProperty(this,property)

}

void setProperty(String property,Object newValue){

println"setProperty() called with name $property and newValue $newValue"

metaClass.setProperty(this,property,newValue)

}

}

//GroovyObjectDemo.groovy

Developer developer = newDeveloper(first:"Dan",last:"Vega",email:"danvega@gmail.com")

developer.writeCode("Groovy")

println developer.first

developer.languages=["Groovy","Java]

//ExpandoDemo.groovy

Expando e = new Expando()

e.first="Dan"

e.last="Vega"

e.email="danvega@gmail.com"

e.getFullName={

"$first,$last"

}

println e.toString()

println e.getFullName()

@groovy.transform.ToString(includeNames =true)

class Person {

String first,last

}

Person p=new Person(first:"Dan,last:"Vega")

p.metaClass.email="danvega@gmail.com"

println p

println p.email

//SquaredDemo.groovy

Integer.metaClass.timesTwo={delegate *2}

println 2.timesTwo()

println 4.timesTwo()

println 5.timesTwo()

println 6.timesTwo()