将字符串注入Map - Groovy

时间:2017-02-26 19:56:40

标签: groovy inject

我是Groovy的新手,并且正在使用Groovy编写的Smartthing Hub的设备处理程序。我在解析字符串时遇到问题。

def parseDescriptionAsMap(description) {
    println "description: '${description}"
    def test = description.split(",")
    println "test: '${test}"
    test.inject([:]) { map, param ->
        def nameAndValue = param.split(":")
        println "nameAndValue: ${nameAndValue}"
        if(map)
        {
            println "map is NOT NULL"
            map.put(nameAndValue[0].trim(),nameAndValue[1].trim())
        }
        else
        {
            println "map is NULL!"
        }
    }
 }

输出:

description: 'index:17, mac:AAA, ip:BBB, port:0058, requestId:ce6598b2-fe8b-463d-bdf3-01ec35055f7a, tempImageKey:ba416127-14e3-4c7b-8f1f-5b4d633102e5
test: '[index:17, mac:AAA, ip:BBB, port:0058, requestId:ce6598b2-fe8b-463d-bdf3-01ec35055f7a, tempImageKey:ba416127-14e3-4c7b-8f1f-5b4d633102e5]
nameAndValue: [index, 17]
nameAndValue: [ mac, AAA]
map is NULL!
nameAndValue: [ ip, BBB]
map is NULL!
map is NULL!
nameAndValue: [ port, 0058]
nameAndValue: [ requestId, ce6598b2-fe8b-463d-bdf3-01ec35055f7a]

两个问题:
1.为什么变量map,null?
2.为什么函数不打印nameAndValue->'tempImageKey'信息?

1 个答案:

答案 0 :(得分:2)

  1. map不能为null,if(map)检查它是否为null或为空......在这种情况下它不会为空(只要你遵循#2)
  2. 您需要从map关闭返回inject,以便汇总。

    test.inject([:]) { map, param ->
        def nameAndValue = param.split(":")
        println "nameAndValue: ${nameAndValue}"
        map.put(nameAndValue[0].trim(),nameAndValue[1].trim())
        map
    }
    
  3. 您尝试的更简单的版本是:

    description.split(',')*.trim()*.tokenize(':').collectEntries()