/*
* Copyright 2014 The original authors
*
* 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 org.vaadin.spring.events.internal;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.lang.reflect.ParameterizedType;
import org.vaadin.spring.events.Event;
import org.vaadin.spring.events.EventBus;
import org.vaadin.spring.events.EventBusListenerMethod;
import org.vaadin.spring.events.EventBusListenerMethodFilter;
import org.vaadin.spring.events.EventScope;
/**
* Implementation of {@link org.vaadin.spring.events.internal.AbstractListenerWrapper} that wraps an object
* that contains a method annotated with {@link org.vaadin.spring.events.EventBusListenerMethod}. If the object
* contains multiple listener methods, multiple instances of this class should be created.
*
* @author Petter Holmström (petter@vaadin.com)
*/
class MethodListenerWrapper extends AbstractListenerWrapper {
private final Class<?> payloadType;
private final boolean payloadMethod;
private transient Method listenerMethod;
public MethodListenerWrapper(EventBus owningEventBus, Object listenerTarget, boolean includingPropagatingEvents, Method listenerMethod) {
super(owningEventBus, listenerTarget, includingPropagatingEvents);
if (listenerMethod.getParameterTypes()[0] == Event.class) {
ParameterizedType type = (ParameterizedType) listenerMethod.getGenericParameterTypes()[0];
payloadType = (Class<?>) type.getActualTypeArguments()[0];
payloadMethod = false;
} else {
payloadType = listenerMethod.getParameterTypes()[0];
payloadMethod = true;
}
this.listenerMethod = listenerMethod;
}
private void readObject(ObjectInputStream ois) throws IOException, ClassNotFoundException {
ois.defaultReadObject();
// TODO Read listener method info and look up method
}
private void writeObject(ObjectOutputStream oos) throws IOException {
oos.defaultWriteObject();
// TODO Write listener method info
}
@Override
public Class<?> getPayloadType() {
return payloadType;
}
@Override
public void publish(Event<?> event) {
listenerMethod.setAccessible(true);
try {
if (payloadMethod) {
listenerMethod.invoke(getListenerTarget(), event.getPayload());
} else {
listenerMethod.invoke(getListenerTarget(), event);
}
} catch (IllegalAccessException e) {
throw new RuntimeException("Could not access listener method " + listenerMethod.getName());
} catch (InvocationTargetException e) {
Throwable targetException = e.getTargetException();
if (targetException instanceof RuntimeException) {
throw (RuntimeException) targetException;
} else {
throw new RuntimeException("A checked exception occurred while invoking listener method " + listenerMethod.getName(), targetException);
}
}
}
@Override
public boolean supports(Event<?> event) {
boolean supports = super.supports(event);
try {
if (listenerMethod.isAnnotationPresent(EventBusListenerMethod.class)) {
EventBusListenerMethod annotation = listenerMethod.getAnnotation(EventBusListenerMethod.class);
EventBusListenerMethodFilter filter = annotation.filter().newInstance();
EventScope scope = annotation.scope();
if (scope.equals(EventScope.UNDEFINED)) {
scope = event.getScope();
}
supports = supports && filter.filter(event.getPayload()) && event.getScope().equals(scope);
}
} catch (Exception e) {
throw new RuntimeException("A checked exception occurred while invoking listener method " + listenerMethod.getName(), e);
}
return supports;
}
}