// ---------------------------------------
// ------ Interactions -------------------
// ---------------------------------------
/**
* Drill into a nested structure to get to some subtree in the document. We allow the path to include a mix
* of array notation and string keys.
*
* @param path
*
* @return A new JSONParse wrapper that wraps the targeted subtree.
* @throws NotAnArrayException if we try to apply an array notation to a node that isn't an array
* @throws NotAnObjectException if we try to apply a map key to a node that isn't an object
* @throws MissingKeyException if part of the path can't be resolved because there is no match on that key
*/
public JSONParse get(string path)
{
JSONParse currentNode = this; // we start with ourselves and drill deeper
// drill down through the nested structure
foreach (string key in path.split("\\."))
{
// check to see if we are going to parse this key as a reference to an array item
Matcher arrayMatcher = ARRAY_NOTATION.matcher(key);
if (arrayMatcher.matches())
{
int index = Integer.valueOf(arrayMatcher.group(1));
currentNode = currentNode.asList().get(index);
}
else
{
// otherwise, treat this key as a normal map key
Map <string, JSONParse> wrappedMap = currentNode.asMap();
if (!wrappedMap.containsKey(key))
{
throw new MissingKeyException("No match found for <" + key + ">: " + wrappedMap.keySet());
}
currentNode = wrappedMap.get(key);
}
}
return(currentNode);
}
static void testRootNotAnObjectException()
{
JSONParse parser = new JSONParse(SAMPLE3);
try
{
parser.asMap();
System.assert(false, "Root node is not an object, should have seen an exception about that.");
}
catch (JSONParse.NotAnObjectException e)
{
System.assert(e.getMessage().startsWith("The wrapped value is not a JSON object:"));
}
}
