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/*******************************************************************************
* Copyright (c) 2014 Raymond Augé and others.
*
* This program and the accompanying materials
* are made available under the terms of the Eclipse Public License 2.0
* which accompanies this distribution, and is available at
* https://www.eclipse.org/legal/epl-2.0/
*
* SPDX-License-Identifier: EPL-2.0
*
* Contributors:
* Raymond Augé <raymond.auge@liferay.com> - Bug 436698
******************************************************************************/
package org.eclipse.equinox.http.servlet.internal.util;
import java.util.*;
import java.util.concurrent.*;
import org.eclipse.equinox.http.servlet.internal.registration.ListenerRegistration;
public class EventListeners {
public void clear() {
map.clear();
}
public <E extends EventListener> List<E> get(Class<E> clazz) {
if (clazz == null) {
throw new NullPointerException("clazz can't be null");
}
List<ListenerRegistration> list = map.get(clazz);
if (list == null) {
return Collections.emptyList();
}
return new ListenerList<E>(list) ;
}
public <E extends EventListener> void put(
Class<E> clazz, ListenerRegistration listenerRegistration) {
if (clazz == null) {
throw new NullPointerException("clazz can't be null");
}
List<ListenerRegistration> list = map.get(clazz);
if (list == null) {
final List<ListenerRegistration> newList =
new CopyOnWriteArrayList<ListenerRegistration>();
list = map.putIfAbsent(clazz, newList);
if (list == null) {
list = newList;
}
}
list.add(listenerRegistration);
}
public void put(
List<Class<? extends EventListener>> classes,
ListenerRegistration listenerRegistration) {
for (Class<? extends EventListener> clazz : classes) {
put(clazz, listenerRegistration);
}
}
public <E extends EventListener> void remove(
Class<E> clazz, ListenerRegistration listenerRegistration) {
if (clazz == null) {
throw new NullPointerException("clazz can't be null");
}
List<ListenerRegistration> list = map.get(clazz);
if (list == null) {
return;
}
list.remove(listenerRegistration);
}
public void remove(
List<Class<? extends EventListener>> classes,
ListenerRegistration listenerRegistration) {
for (Class<? extends EventListener> clazz : classes) {
remove(clazz, listenerRegistration);
}
}
private ConcurrentMap<Class<? extends EventListener>, List<ListenerRegistration>> map =
new ConcurrentHashMap<Class<? extends EventListener>, List<ListenerRegistration>>();
class ListenerList<R extends EventListener> extends AbstractList<R> {
ListenerList(List<ListenerRegistration> list) {
this.list = list;
}
@Override
@SuppressWarnings("unchecked")
public R get(int index) {
return (R)list.get(index).getT();
}
@Override
public int size() {
return list.size();
}
private List<ListenerRegistration> list;
}
}
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