/**
* Processes a JSON request.
*
* @param request Original JSON request
* @return The JSON response.
*/
public JsonObject Process(JsonObject request)
{
JsonObject response = new JsonObject();
JsonObject requestContext = request.getJSONObject("context");
JsonArray requestedGadgets = request["gadgets"] as JsonArray;
// Process all JSON first so that we don't wind up with hanging threads if
// a JsonException is thrown.
List<IAsyncResult> gadgets = new List<IAsyncResult>(requestedGadgets.Length);
for (int i = 0, j = requestedGadgets.Length; i < j; ++i)
{
var context = new JsonRpcGadgetContext(requestContext, (JsonObject)requestedGadgets[i]);
PreloadProcessor proc = new PreloadProcessor(CallJob);
IAsyncResult result = proc.BeginInvoke(context, null, null);
gadgets.Add(result);
}
foreach (var entry in gadgets)
{
try
{
AsyncResult result = (AsyncResult)entry;
PreloadProcessor proc = (PreloadProcessor)result.AsyncDelegate;
JsonObject gadget = proc.EndInvoke(result);
response.Accumulate("gadgets", gadget);
}
catch (JsonException e)
{
throw new RpcException("Unable to write JSON", e);
}
catch (Exception ee)
{
if (!(ee is RpcException))
{
throw new RpcException("Processing interrupted", ee);
}
RpcException e = (RpcException)ee;
// Just one gadget failed; mark it as such.
try
{
GadgetContext context = e.Context;
JsonObject errorObj = new JsonObject();
errorObj.Put("url", context.getUrl())
.Put("moduleId", context.getModuleId());
errorObj.Accumulate("errors", e.Message);
response.Accumulate("gadgets", errorObj);
}
catch (JsonException je)
{
throw new RpcException("Unable to write JSON", je);
}
}
}
return response;
}
/**
* Inspects the passed object for one of several specific properties and, if
* found, returns that property as a JsonObject object. All valid response
* objects which encapsulate a single data item (e.g. a person) must have
* this property.
*
* @param root JsonObject to query for the presence of the specific property
* @throws OpenSocialRequestException if property is not found _in the passed
* object
* @throws JSONException
*/
private static JsonObject getEntryObject(JsonObject root)
{
JsonObject entry = new JsonObject();
if (root.Contains("data")) {
entry = root.getJSONObject("data");
} else if (root.Contains("entry")) {
entry = root.getJSONObject("entry");
} else {
throw new OpenSocialRequestException("Entry not found");
}
return entry;
}
/**
* Recursively iterates through the properties of the passed JsonObject
* object and returns a Map of OpenSocialField objects keyed on Strings
* representing the property values and names respectively.
*
* @param o Object-oriented representation of a JSON object which is
* transformed into and returned as a Map of OpenSocialField
* objects keyed on Strings
* @throws JSONException
*/
private static Dictionary<String, OpenSocialField> createObjectRepresentation(
JsonObject o)
{
Dictionary<String,OpenSocialField> r = new Dictionary<String,OpenSocialField>();
var keys = o.Names;
foreach (string key in keys)
{
String property = o[key].ToString();
if (property.Length > 0 && property[0] == '{') {
JsonObject p = o.getJSONObject(key);
OpenSocialField field = new OpenSocialField(true);
field.addValue(new OpenSocialObject(createObjectRepresentation(p)));
r.Add(key, field);
} else if (property.Length > 0 && property[0] == '[') {
JsonArray p = (JsonArray)o[key];
var values = createArrayRepresentation(p);
OpenSocialField field = new OpenSocialField(true);
foreach(var v in values) {
field.addValue(v);
}
r.Add(key, field);
} else if (property.Length > 0) {
OpenSocialField field = new OpenSocialField(false);
field.addValue(unescape(property));
r.Add(key, field);
}
}
return r;
}
/**
* Inspects the passed object for one of several specific properties and, if
* found, returns that property as a JsonArray object. All valid response
* objects which contain a data collection (e.g. a collection of people)
* must have this property.
*
* @param root JsonObject to query for the presence of the specific property
* @throws OpenSocialRequestException if property is not found _in the passed
* object
* @throws JSONException
*/
private static JsonArray getEntryArray(JsonObject root)
{
JsonArray entry = new JsonArray();
if (root.Contains("entry")) {
entry = (JsonArray)root["entry"];
} else if (root.Contains("data")) {
entry = (JsonArray)root.getJSONObject("data")["list"];
} else {
throw new OpenSocialRequestException("Entry not found");
}
return entry;
}
