Groovy JsonBuilder experiments

j.groovy

// Demonstrate various features of the Groovy StreamingJsonBuilder
// run this with groovy <filename>
// See below for typical output

// A Groovy class
class Resource { String path; String resourceType }

// Groovy list of resources
resources  = [
  new Resource(path:"/tmp/one", resourceType:"my/example"),
  new Resource(path:"/tmp/two", resourceType:"my/example"),
  new Resource(path:"/tmp/two/k", resourceType:"other/type"),
]

// Test on a pure Java collection as well
list = new ArrayList<Resource>()
list.add(new Resource(path:"foo", resourceType:"T2"))
list.add(new Resource(path:"foo2", resourceType:"T3"))
list.add(new Resource(path:"bar", resourceType:"T4"))

out = new java.io.OutputStreamWriter(System.out)

// Here's the builder
new groovy.json.StreamingJsonBuilder(out)
.testingTheBuilder {
  person {
    lastName 'DaVinci'
    address(
      city: 'Manchester',
      country: 'UK',
      zip: "M1 2AB",
    )
    living true
    dynamicValue "Current date is ${ new java.util.Date() }"
    eyes 'left', 'right'
  }
  playingWithResourceObjects {
    rawChildren resources

    convertedChildren resources.collect { r -> [ "upperPath":r.path.toUpperCase() ] }

    filteredChildren (
      resources.findAll { it.path.contains("two") }
      .collect  { r -> [ "justPath":r.path ] }
    )
  }
  dataFromJavaTypes {
    rawList list.each {}

    filteredList (
      list.findAll { it.path.contains("foo") }
      .collect { r -> [ resourceType:r.resourceType ] }
    )
  }
}

out.flush()

/* Typical output
{
  "testingTheBuilder": {
    "person": {
      "lastName": "DaVinci",
      "address": {
        "city": "Manchester",
        "country": "UK",
        "zip": "M1 2AB"
      },
      "living": true,
      "dynamicValue": "Current date is Thu Jun 30 16:56:57 CEST 2016",
      "eyes": [
        "left",
        "right"
      ]
    },
    "playingWithResourceObjects": {
      "rawChildren": [
        {
          "resourceType": "my/example",
          "path": "/tmp/one"
        },
        {
          "resourceType": "my/example",
          "path": "/tmp/two"
        },
        {
          "resourceType": "other/type",
          "path": "/tmp/two/k"
        }
      ],
      "convertedChildren": [
        {
          "upperPath": "/TMP/ONE"
        },
        {
          "upperPath": "/TMP/TWO"
        },
        {
          "upperPath": "/TMP/TWO/K"
        }
      ],
      "filteredChildren": [
        {
          "justPath": "/tmp/two"
        },
        {
          "justPath": "/tmp/two/k"
        }
      ]
    },
    "dataFromJavaTypes": {
      "rawList": [
        {
          "resourceType": "T2",
          "path": "foo"
        },
        {
          "resourceType": "T3",
          "path": "foo2"
        },
        {
          "resourceType": "T4",
          "path": "bar"
        }
      ],
      "filteredList": [
        {
          "resourceType": "T2"
        },
        {
          "resourceType": "T3"
        }
      ]
    }
  }
}
*/