Query on object filters

[MailNSrinivasan]

While using the object filters is there any way to remove the null values inside a array. for instance my output is

{
  "images" : [
      {
           "imageName" : "image_1",
           "imageurl" : "url_1"
      },
      {
           "imageName" : "image_2",
           "imageurl" : "url_2"
      },
      null,
      null
   ]
}

Expression e = new Parser(reader)
.withObjectFilter(". == null or . == {} or . == []")
.compile();

[catull]

Try this in the JSTL-script:

def process (array, acc)
  let img      = $array[0]
  let newArray = $array[1:] // new array is the old one without the first element

  if (size ($array) == 0)
     // done, return the accumulator
     $acc
  else if ($img.imageName and $img.imageurl)
     // object carries both attributes, add it to the accumulator
    process ($newArray, $acc + [ $img ])
  else
    // null, or incomplete object, ignore it, carry on
    process ($newArray, $acc)
 
// process the array of images, w/ initial empty accumulator
process (.images, [ ])

Basically, you iterate over the array of images and only collect objects with both attributes.