[ GroovyGN ] Define Your Own Type Conversion

Source From Here 
Introduction 
In Groovy we can override the method asType() to convert an object into another type. We can use the method asType() in our code to invoke the conversion (Check DefaultGroovyMethods), but we can even make it shorter an useas. 

Sample Code 

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1. class Size {  
2.     def x, y  
3.       
4.     Object asType(Class clazz) {  
5.         if (clazz == SquaredSize) {  
6.             new SquaredSize(x: x**2, y: y**2)  
7.         }  
8.     }  
9. }  
10.   
11. class SquaredSize {  
12.     def x, y  
13.       
14.     String toString() { "x: $x, y: $y" }  
15. }  
16.   
17. def size = new Size(x: 10, y: 5)  
18. def squared = size as SquaredSize  // Or size.asType(SquaredSize)  
19.   
20. println squared  // Output: x: 100, y: 25  
21.   
22. assert 100 == squared.x  
23. assert 25 == squared.y