groovy_AST_Transformation.groovy

/**
 * GroovyASTTransformation の お話
 * 
 * Annotation Based AST Transformations
 * 
 * AST にアクセスする一つの手段が Annotation を介してアクセスする方法。
 **/

/**
 * 例 3 : @Canonical
 **/

import groovy.transform.*

@Canonical
@EqualsAndHashCode (excludes = ['year', 'model'])
class Car {
    String VIN
    String engineNumber
    int year
    String model
}

def celsior = new Car (
        VIN : 'UCF11989X02254931',
        engineNumber : '1UZFE-083566',
        year : 1998, 
        model : 'Celsior')
def crown   = new Car (
        VIN : 'S140C989X00344259',
        engineNumber : '1UZFE-092317',
        year : 1998, 
        model : 'Crown Magesta')

assert celsior != crown

def century = new Car (
        VIN : 'UCF11989X02254931',
        engineNumber : '1UZFE-083566',
        year : 2004,
        model : 'Century')

assert celsior != century

result.txt

Assertion failed: 

assert celsior != century
       |       |  |
       |       |  Car(UCF11989X02254931, 1UZFE-083566, 2004, Century)
       |       false
       Car(UCF11989X02254931, 1UZFE-083566, 1998, Celsior)