// g100pon #40 XMLの読み書きを色んな方法で(XmlSlurper->StreamingMarkupBuilder)

import groovy.xml.StreamingMarkupBuilder

// パース結果のオブジェクトはGPath型なので、GPath型で定義されているメソッド以外は使えない
def root = new XmlSlurper().parse('sample.xml')

def groceries = root.category.findAll{ it.@type == 'groceries' }
def g = groceries[0]

g.item.eachWithIndex {item, i ->
    g.item[i] = 'luxury ' + item
}

def supplies = root.category.findAll{ it.@type == 'supplies' }
def pens = supplies[0].item.findAll{ it.text() == 'pen' }
pens.each { p ->
    p.@quantity = (p.@quantity.toInteger() + 2).toString()
    p.@when = 'Urgent'
}

def presents = root.category.find{ it.@type == 'present' }
presents.replaceNode{ node ->
    category(type:'present'){
        item("mother's birthday")
        item("Monica's birthday", when:'Oct 15')
    }
}

def out = new OutputStreamWriter(
		new FileOutputStream("xmlslurper.output.xml"), "UTF-8")

// XMLの構造しか保持していないので、MarkupBuilderで組み立て直す必要がある
def outputBuilder = new StreamingMarkupBuilder()
def writer = outputBuilder.bind{
	mkp.xmlDeclaration()
	mkp.yield(root)
}
out << writer