Groovy: Coercion operator (as)

Coercion operator is used to convert one object to other. Objects no need to be compatible.

How to perform coercion?

By specifying the Coercion rule, we can convert two incompatible objects.

For example, I specify the asType method, it convers the Employee object to Person object.

class Employee{

         String firstName

         String lastName

         String id

        

         def asType(Class target) {                                             

        if (target == Person) {

            return new Person(name: firstName + "," + lastName, id : id)

        }

        throw new ClassCastException("Employee cannot be coerced into $target")

    }

}

HelloWorld.groovy

class Employee{
 String firstName
 String lastName
 String id
 
 def asType(Class target) {                                              
        if (target == Person) {
            return new Person(name: firstName + "," + lastName, id : id)
        }
        throw new ClassCastException("Employee cannot be coerced into $target")
    }
}

class Person{
 String name
 String id
}

Employee emp = new Employee(firstName : "Krishna", lastName : "Gurram", id : "Id123")
Person person = emp as Person

println "name : ${person.name}, id : ${person.id}"

Output

name : Krishna,Gurram, id : Id123

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