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 2 : @Delegate
 **/

import groovy.transform.*

@ToString (includeNames = true)
class Order {
    long orderId
    String person
    Date orderedAt
}

class OrderDetail {
    @Delegate Order order
    long detailId
    String item
    int price
}

def order = new Order(orderId : 100L, person : 'mike', orderedAt : Date.parse('yyyyMMdd', '20130309'))
def list = [
    [id : 1L, item : '風邪薬', price : 670],
    [id : 2L, item : '頭痛薬', price : 1200],
    [id : 3L, item : 'ウナコーワ', price : 380]
].collect {entry ->
    new OrderDetail (order : order, detailId : entry.id, item : entry.item, price : entry.price)
}

list.eachWithIndex {entry, indx ->
    println "${indx}, ${entry.person}, ${entry.item}, ${entry.price}, ${entry.orderedAt.format('yyyy-MM-dd')}"
}

list[0].person = 'mike_neck'
list.eachWithIndex {entry, indx ->
    println "${indx}, ${entry.person}, ${entry.item}, ${entry.price}, ${entry.orderedAt.format('yyyy-MM-dd')}"
}
println order

result.txt

0, mike, 風邪薬, 670, 2013-03-09
1, mike, 頭痛薬, 1200, 2013-03-09
2, mike, ウナコーワ, 380, 2013-03-09
0, mike_neck, 風邪薬, 670, 2013-03-09
1, mike_neck, 頭痛薬, 1200, 2013-03-09
2, mike_neck, ウナコーワ, 380, 2013-03-09
Order(orderId:100, person:mike_neck, orderedAt:Sat Mar 09 00:00:00 JST 2013)