/**
* Copyright 2012 Nikita Koksharov
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.corundumstudio.socketio.annotation;
import java.lang.annotation.Annotation;
import java.lang.reflect.Method;
import com.corundumstudio.socketio.AckRequest;
import com.corundumstudio.socketio.SocketIOClient;
import com.corundumstudio.socketio.handler.SocketIOException;
import com.corundumstudio.socketio.listener.DataListener;
import com.corundumstudio.socketio.namespace.Namespace;
public class OnJsonObjectScanner implements AnnotationScanner {
@Override
public Class<? extends Annotation> getScanAnnotation() {
return OnJsonObject.class;
}
@Override
@SuppressWarnings("unchecked")
public void addListener(Namespace namespace, final Object object, final Class clazz, final Method method) {
final int socketIOClientIndex = paramIndex(method, SocketIOClient.class);
final int ackRequestIndex = paramIndex(method, AckRequest.class);
final int dataIndex = dataIndex(method);
Class objectType = method.getParameterTypes()[dataIndex];
namespace.addJsonObjectListener(objectType, new DataListener<Object>() {
@Override
public void onData(SocketIOClient client, Object data, AckRequest ackSender) {
try {
Object[] args = new Object[method.getParameterTypes().length];
if (socketIOClientIndex != -1) {
args[socketIOClientIndex] = client;
}
if (ackRequestIndex != -1) {
args[ackRequestIndex] = ackSender;
}
if (dataIndex != -1) {
args[dataIndex] = data;
}
method.invoke(object, args);
} catch (Exception e) {
throw new SocketIOException(e);
}
}
});
}
private int dataIndex(Method method) {
int index = 0;
for (Class type : method.getParameterTypes()) {
if (!type.equals(AckRequest.class) && !type.equals(SocketIOClient.class)) {
return index;
}
index++;
}
return -1;
}
private int paramIndex(Method method, Class clazz) {
int index = 0;
for (Class type : method.getParameterTypes()) {
if (type.equals(clazz)) {
return index;
}
index++;
}
return -1;
}
@Override
public void validate(Method method, Class clazz) {
int paramsCount = 3;
final int socketIOClientIndex = paramIndex(method, SocketIOClient.class);
final int ackRequestIndex = paramIndex(method, AckRequest.class);
final int dataIndex = dataIndex(method);
if (dataIndex == -1) {
throw new IllegalArgumentException("Wrong OnJsonObject listener signature: " + clazz + "." + method.getName() + " Data parameter is mandatory.");
}
if (socketIOClientIndex == -1) {
paramsCount--;
}
if (ackRequestIndex == -1) {
paramsCount--;
}
if (paramsCount != method.getParameterTypes().length) {
throw new IllegalArgumentException("Wrong OnJsonObject listener signature: " + clazz + "." + method.getName());
}
}
}