Groovy JsonBuilder with simulated Sling resource wrapper

jsonwrapped.groovy

// Experimenting with Groovy JsonBuilder as a way to implement
// a JSON builder script engine for Sling

// The Sling .jsonbuild script would only contain the part
// between // SCRIPT markers below, the rest is glue that
// this new scripting engine would provide

// We'll probably need a Groovy-friendly wrapper
// with convenience methods for the current resource,
// where the tree navigation starts from
class Resource { 
  String path 
  def props = [ : ]
  
  Resource(path) {
    this.path = path
    props["title"] = "This is ${this.path}"
  }
  
  // get a specific child resource
  def child(path) {
    new Resource(this.path  + "/" + path)
  }
  
  // get list of child resources, simulating a query
  def children(prefix, number) {
    def result = []
    for(i in 1..number) {
      result << child(prefix + "_" + i)
    }
    result
  }
}

// The Sling script engine would provide the current
// resource wrapped in this r variable
r = new Resource("/currentResource")
out = new java.io.OutputStreamWriter(System.out)
new groovy.json.StreamingJsonBuilder(out) .
  // SCRIPT - this is the part that's supplied as a Sling script
  root {
    def kids = r.child("sub").children("kid", 3)
    path r.path
    title r.props.title
    childCount kids.size
    childPaths kids.collect { r -> path:r.path }
  }
  // SCRIPT ends here
out.flush()

/* Typical output

{
  "root": {
    "path": "/currentResource",
    "title": "This is /currentResource",
    "childCount": 3,
    "childPaths": [
      "/currentResource/sub/kid_1",
      "/currentResource/sub/kid_2",
      "/currentResource/sub/kid_3"
    ]
  }
}

*/