/**
* * Invokes one of the resource methods annotated with {@link MethodMapping}.
*
* @param mappedMethod mapping info of the method.
* @param attributes Attributes object for the current request.
* @return the value returned by the invoked method
*/
private Object invokeMappedMethod(MethodMappingInfo mappedMethod, Attributes attributes) {
Method method = mappedMethod.getMethod();
List parametersValues = new ArrayList();
// Attributes objects
PageParameters pageParameters = attributes.getParameters();
WebResponse response = (WebResponse) attributes.getResponse();
HttpMethod httpMethod = HttpUtils.getHttpMethod((WebRequest) RequestCycle.get().getRequest());
LinkedHashMap<String, String> pathParameters =
mappedMethod.populatePathParameters(pageParameters);
Iterator<String> pathParamsIterator = pathParameters.values().iterator();
Class<?>[] parameterTypes = method.getParameterTypes();
for (int i = 0; i < parameterTypes.length; i++) {
Object paramValue = null;
MethodParameter methodParameter = new MethodParameter(parameterTypes[i], mappedMethod, i);
Annotation annotation = ReflectionUtils.getAnnotationParam(i, method);
// retrieve parameter value
if (annotation != null)
paramValue =
extractParameterValue(methodParameter, pathParameters, annotation, pageParameters);
else paramValue = extractParameterFromUrl(methodParameter, pathParamsIterator);
// try to use the default value
if (paramValue == null && !methodParameter.getDeaultValue().isEmpty())
paramValue =
toObject(methodParameter.getParameterClass(), methodParameter.getDeaultValue());
if (paramValue == null && methodParameter.isRequired()) {
response.sendError(
400,
"No suitable method found for URL '"
+ extractUrlFromRequest()
+ "' and HTTP method "
+ httpMethod);
return null;
}
parametersValues.add(paramValue);
}
try {
return method.invoke(this, parametersValues.toArray());
} catch (Exception e) {
response.sendError(500, "General server error.");
throw new RuntimeException("Error invoking method '" + method.getName() + "'", e);
}
}
/**
* * Handles a REST request invoking one of the methods annotated with {@link MethodMapping}. If
* the annotated method returns a value, this latter is automatically serialized to a given string
* format (like JSON, XML, etc...) and written to the web response.<br>
* If no method is found to serve the current request, a 400 HTTP code is returned to the client.
* Similarly, a 401 HTTP code is return if the user doesn't own one of the roles required to
* execute an annotated method (See {@link AuthorizeInvocation}).
*/
@Override
public final void respond(Attributes attributes) {
PageParameters pageParameters = attributes.getParameters();
WebResponse response = (WebResponse) attributes.getResponse();
HttpMethod httpMethod = HttpUtils.getHttpMethod((WebRequest) RequestCycle.get().getRequest());
int indexedParamCount = pageParameters.getIndexedCount();
// mapped method are stored concatenating the number of the segments of
// their URL and their HTTP method (see annotation MethodMapping)
List<MethodMappingInfo> mappedMethodsCandidates =
mappedMethods.get(indexedParamCount + "_" + httpMethod.getMethod());
MethodMappingInfo mappedMethod =
selectMostSuitedMethod(mappedMethodsCandidates, pageParameters);
if (mappedMethod != null) {
if (!hasAny(mappedMethod.getRoles())) {
response.sendError(401, "User is not allowed to invoke method on server.");
return;
}
onBeforeMethodInvoked(mappedMethod, attributes);
Object result = invokeMappedMethod(mappedMethod, attributes);
onAfterMethodInvoked(mappedMethod, attributes, result);
// if the invoked method returns a value, it is written to response
if (result != null) {
serializeObjectToResponse(response, result, mappedMethod.getMimeOutputFormat());
}
} else {
response.sendError(
400,
"No suitable method found for URL '"
+ extractUrlFromRequest()
+ "' and HTTP method "
+ httpMethod);
}
}