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EE4J Compatible Implementation for Jakarta Faces API
/*
* Copyright (c) 1997, 2020 Oracle and/or its affiliates. All rights reserved.
*
* This program and the accompanying materials are made available under the
* terms of the Eclipse Public License v. 2.0, which is available at
* http://www.eclipse.org/legal/epl-2.0.
*
* This Source Code may also be made available under the following Secondary
* Licenses when the conditions for such availability set forth in the
* Eclipse Public License v. 2.0 are satisfied: GNU General Public License,
* version 2 with the GNU Classpath Exception, which is available at
* https://www.gnu.org/software/classpath/license.html.
*
* SPDX-License-Identifier: EPL-2.0 OR GPL-2.0 WITH Classpath-exception-2.0
*/
package com.sun.faces.application.applicationimpl.events;
import java.lang.reflect.Constructor;
import java.lang.reflect.InvocationTargetException;
import java.util.HashMap;
import java.util.Map;
import java.util.Set;
import java.util.concurrent.CopyOnWriteArraySet;
import java.util.logging.Level;
import java.util.logging.Logger;
import com.sun.faces.util.FacesLogger;
import jakarta.faces.FacesException;
import jakarta.faces.event.SystemEvent;
import jakarta.faces.event.SystemEventListener;
/**
* Represent a logical association between a SystemEvent and a Source. This call will contain the Listeners specific to
* this association as well as provide a method to construct new SystemEvents as required.
*/
public class EventInfo {
private static final Logger LOGGER = FacesLogger.APPLICATION.getLogger();
private Class systemEvent;
private Class sourceClass;
private Set listeners;
private Constructor eventConstructor;
private Map, Constructor> constructorMap;
// -------------------------------------------------------- Constructors
public EventInfo(Class systemEvent, Class sourceClass) {
this.systemEvent = systemEvent;
this.sourceClass = sourceClass;
listeners = new CopyOnWriteArraySet<>();
constructorMap = new HashMap<>();
if (!sourceClass.equals(Void.class)) {
eventConstructor = getEventConstructor(sourceClass);
}
}
// ------------------------------------------------------ Public Methods
public Set getListeners() {
return listeners;
}
public SystemEvent createSystemEvent(Object source) {
Constructor toInvoke = getCachedConstructor(source.getClass());
if (toInvoke != null) {
try {
return (SystemEvent) toInvoke.newInstance(source);
} catch (InstantiationException | IllegalAccessException | IllegalArgumentException | InvocationTargetException e) {
throw new FacesException(e);
}
}
return null;
}
// ----------------------------------------------------- Private Methods
private Constructor getCachedConstructor(Class source) {
if (eventConstructor != null) {
return eventConstructor;
} else {
Constructor c = constructorMap.get(source);
if (c == null) {
c = getEventConstructor(source);
if (c != null) {
constructorMap.put(source, c);
}
}
return c;
}
}
private Constructor getEventConstructor(Class source) {
Constructor ctor = null;
try {
return systemEvent.getDeclaredConstructor(source);
} catch (NoSuchMethodException ignored) {
Constructor[] ctors = systemEvent.getConstructors();
if (ctors != null) {
for (Constructor c : ctors) {
Class[] params = c.getParameterTypes();
if (params.length != 1) {
continue;
}
if (params[0].isAssignableFrom(source)) {
return c;
}
}
}
if (eventConstructor == null && LOGGER.isLoggable(Level.FINE)) {
LOGGER.log(Level.FINE, "Unable to find Constructor within {0} that accepts {1} instances.",
new Object[] { systemEvent.getName(), sourceClass.getName() });
}
}
return ctor;
}
}