/**
* Sends a JSONP request by embedding a SCRIPT tag into the document.
*
* @param id the id used for the script tag and to identify the callback
* @param request the request to be made
* @param parameters the parameters for the request
* @param function a function that transforms the response into the type that the callback needs
* @param callback the callback that should be called with the transformed response
*/
private <T> void sendJsonpRequest(
String id,
String request,
Map<String, Object> parameters,
final Function<String, ? extends T> function,
final AsyncCallback<T> callback) {
Preconditions.checkNotNull(id);
// Prepare an intermediate callback that converts the String result to T.
if (callback != null) {
Preconditions.checkNotNull(function);
CALLBACKS.put(
id,
new AsyncCallback<String>() {
@Override
public void onSuccess(String jsonResult) {
T result;
try {
result = function.apply(jsonResult);
} catch (RuntimeException e) {
callback.onFailure(e);
return;
}
callback.onSuccess(result);
}
@Override
public void onFailure(Throwable caught) {
callback.onFailure(caught);
}
});
}
// Insert a script tag into the document.
Document document = Document.get();
ScriptElement script = document.createScriptElement();
String uri = makeURI(request, parameters, id);
script.setSrc(uri);
script.setId(id);
Element bodyElement = document.getElementsByTagName("body").getItem(0);
Element previous = document.getElementById(id);
if (previous != null) {
bodyElement.replaceChild(script, previous);
} else {
bodyElement.appendChild(script);
}
}
/**
* Remove all 'TaggedElement' tags from the rootElement. Note this could potentially invalidate
* other TaggedEntities that share an rootElement.
*/
public void unwrap() {
Main.out.println("TaggedEntity.unwrap() : " + getText());
Element parentElement = rootElement.getParentElement();
Node textNode = JSFunctions.createTextNode(getText());
parentElement.replaceChild(textNode, rootElement);
}