Harshal Parekh :
I have a JSONArray (org.json) like this:
[
{ "a": "a" },
{ "b": "a" },
{ "c": "a" },
{ "d": "a" },
{ "e": "a" },
{ "f": "a" },
{ "g": "a" }
]
I would like to remove all the JSONObjects that do not have the key a. Is there a better way to do other than my naive approach?
Iterator objects = jsonArray.iterator();
while (objects.hasNext()) {
Object o = objects.next();
if (o instanceof JSONObject && !((JSONObject) o).has("a")) {
objects.remove();
}
}
Expected output:
[{"a": "a"}]
ETO :
If you're seeking a functional style solution, you can wrap the Iterator into a Stream and then do whatever you want.
One of the functional solutions:
JSONArray newJsonArray =
StreamSupport.stream(jsonArray.spliterator(), false)
.filter(JSONObject.class::isInstance)
.map(JSONObject.class::cast)
.filter(j -> j.has("a"))
.collect(collectingAndThen(toList(), JSONArray::new));
Note: The solution above does not modify the original JSONArray. Following the principles of functional programming one should prefer collecting into a new object rather than modifying the existing one.
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