/**
* 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 java.util.ArrayList;
import java.util.List;
import com.corundumstudio.socketio.AckRequest;
import com.corundumstudio.socketio.MultiTypeArgs;
import com.corundumstudio.socketio.SocketIOClient;
import com.corundumstudio.socketio.handler.SocketIOException;
import com.corundumstudio.socketio.listener.DataListener;
import com.corundumstudio.socketio.listener.MultiTypeEventListener;
import com.corundumstudio.socketio.namespace.Namespace;
public class OnEventScanner implements AnnotationScanner {
@Override
public Class<? extends Annotation> getScanAnnotation() {
return OnEvent.class;
}
@Override
@SuppressWarnings("unchecked")
public void addListener(Namespace namespace, final Object object, final Method method, Annotation annot) {
OnEvent annotation = (OnEvent) annot;
if (annotation.value() == null || annotation.value().trim().length() == 0) {
throw new IllegalArgumentException("OnEvent \"value\" parameter is required");
}
final int socketIOClientIndex = paramIndex(method, SocketIOClient.class);
final int ackRequestIndex = paramIndex(method, AckRequest.class);
final List<Integer> dataIndexes = dataIndexes(method);
if (dataIndexes.size() > 1) {
List<Class> classes = new ArrayList<Class>();
for (int index : dataIndexes) {
Class<?> param = method.getParameterTypes()[index];
classes.add(param);
}
namespace.addMultiTypeEventListener(annotation.value(), new MultiTypeEventListener() {
@Override
public void onData(SocketIOClient client, MultiTypeArgs data, AckRequest ackSender) {
try {
Object[] args = new Object[method.getParameterTypes().length];
if (socketIOClientIndex != -1) {
args[socketIOClientIndex] = client;
}
if (ackRequestIndex != -1) {
args[ackRequestIndex] = ackSender;
}
int i = 0;
for (int index : dataIndexes) {
args[index] = data.get(i);
i++;
}
method.invoke(object, args);
} catch (Exception e) {
throw new SocketIOException(e);
}
}
}, classes.toArray(new Class[classes.size()]));
} else {
Class objectType = Void.class;
if (!dataIndexes.isEmpty()) {
objectType = method.getParameterTypes()[dataIndexes.iterator().next()];
}
namespace.addEventListener(annotation.value(), 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 (!dataIndexes.isEmpty()) {
int dataIndex = dataIndexes.iterator().next();
args[dataIndex] = data;
}
method.invoke(object, args);
} catch (Exception e) {
throw new SocketIOException(e);
}
}
});
}
}
private List<Integer> dataIndexes(Method method) {
List<Integer> result = new ArrayList<Integer>();
int index = 0;
for (Class type : method.getParameterTypes()) {
if (!type.equals(AckRequest.class) && !type.equals(SocketIOClient.class)) {
result.add(index);
}
index++;
}
return result;
}
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 = method.getParameterTypes().length;
final int socketIOClientIndex = paramIndex(method, SocketIOClient.class);
final int ackRequestIndex = paramIndex(method, AckRequest.class);
List<Integer> dataIndexes = dataIndexes(method);
paramsCount -= dataIndexes.size();
if (socketIOClientIndex != -1) {
paramsCount--;
}
if (ackRequestIndex != -1) {
paramsCount--;
}
if (paramsCount != 0) {
throw new IllegalArgumentException("Wrong OnEvent listener signature: " + clazz + "." + method.getName());
}
}
}