[jira] [Created] (TAP5-2747) KeyPath-based traversal of JSONCollection

["Ben Weidig (Jira)" <ji...@apache.org>]

Ben Weidig created TAP5-2747:
--------------------------------

             Summary: KeyPath-based traversal of JSONCollection
                 Key: TAP5-2747
                 URL: https://issues.apache.org/jira/browse/TAP5-2747
             Project: Tapestry 5
          Issue Type: New Feature
          Components: tapestry-json
    Affects Versions: 5.8.2
            Reporter: Ben Weidig


As navigation nested JSONObject structures can be tedious, so I propose adding a String-based KeyPath traversal system.

For example:
{code:java}
JSONObject json = ...
// {
//   outer: { inner: "here" },
//   array: [
//     1,
//     { innerArray: ["A", "B", "C"] },
//     ["Z", "Y", "X"]
//   ]
// }

var result = json.getByKeyPath("array[1].innerArray[5]?");
// Equivalent to
var result = json.getByKeyPath("array[1].innerArray[5]?");{code}
 

The getByKeyPath method returns an Object, but the other types are available, too.

The following types of keypaths should be supported:
 * JSONObject navigation, e.g. "outer.inner" -> "here"
 * JSONArray indices, e.g. "array[0]" -> 1
 * JSONArray indices without key, e.g. "array.[0]" -> 1
 * Optionality, e.g, "outer.nonExistant?" -> null

I already have a proof-of-concept working. However, it requires some cleanup and a lot of testing before being ready.



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