public JSONSelector(JSONWalkingEvents events, string[] paths, JSONSelectorOptions options)
{
if (null == events)
{
throw new ArgumentNullException("events");
}
_events = events;
paths = paths ?? new string[0];
if (options.IgnoreArrays())
{
// Filter out paths containing array specifiers
_paths = paths.Where(p => -1 == p.IndexOf(ArraySpecifier))
.ToDictionary<string, string>(p => p);
}
else
{
_paths = paths.ToDictionary<string, string>(p => p);
}
_selectedValues = new List<SelectedValue>();
_options = options;
_objectPathStack = new Stack<string>();
_objectPath = string.Empty;
_memberPath = string.Empty;
_arrayIndex = -1;
_arrayIndexStack = new Stack<int>();
_events.ObjectStart += new JSONEventHandler(_events_ObjectStart);
_events.ObjectEnd += new JSONEventHandler(_events_ObjectEnd);
_events.ObjectKey += new JSONEventHandler<string>(_events_ObjectKey);
_events.ArrayStart += new JSONEventHandler(_events_ArrayStart);
_events.ArrayEnd += new JSONEventHandler(_events_ArrayEnd);
_events.ArrayNext += new JSONEventHandler(_events_ArrayNext);
_events.String += new JSONEventHandler<string>(_events_String);
_events.Number += new JSONEventHandler<decimal>(_events_Number);
_events.Null += new JSONEventHandler(_events_Null);
_events.Boolean += new JSONEventHandler<bool>(_events_Boolean);
}
public static SelectedValue[] SelectValues(TextReader json, string[] selectors, JSONSelectorOptions options)
{
if (null == json)
{
return new SelectedValue[0];
}
// Create tokenizer for the JSON text - this is fed to a Tree Walking Validator
JSONTokenizer tokenizer = new JSONTokenizer(json);
// Create an events object for the Tree Walker - events are fired as the walker
// traverses nodes in the tree.
JSONWalkingEvents events = new JSONWalkingEvents();
// The selector subscribes to the Walker Events and selects the appropriate values from the
// JSON tree.
JSONSelector selector = new JSONSelector(events, selectors);
// A JSON Tree Walker that validates the structure of the JSON and also fires events
// while traversing the tree.
JSONWalkingValidator walker = new JSONWalkingValidator();
walker.Walk(tokenizer.GetEnumerator(), events);
// Retrieve the values selected from the JSON.
return selector.SelectedValues;
}
private static bool IsOptionSet(this JSONSelectorOptions options, JSONSelectorOptions flagToCheck)
{
return (flagToCheck == (flagToCheck & options));
}
public static SelectedValue[] SelectValues(string json, string[] selectors, JSONSelectorOptions options)
{
if (string.IsNullOrEmpty(json))
{
return new SelectedValue[0];
}
return SelectValues(new StringReader(json), selectors, options);
}
