Creating Json in Xtend.

Json.xtend

package json

import org.eclipse.xtext.xbase.lib.Pair
import java.util.List
import com.google.common.collect.Maps

class Json {
  
  def static void main(String[] args) {
    val json = map(
                    "aa" -> 111,
                    "bb" -> list(4,5,6),
                    "cc" -> map(
                      "dd" -> "777"
                    )
                  )
      println(json)
  }
  
  def static <K, V> map(Pair<?, ?>... entries){
    val result = Maps::<Object, Object>newHashMap
    entries.forEach[
      result.put(key, value)
    ]
    return result
  }
  
  def static <T> List<T> list(T... entries){
    return newArrayList(entries)
  }
  
}