| /******************************************************************************* |
| * Copyright (c) 2014 Raymond Augé and others. |
| * All rights reserved. This program and the accompanying materials |
| * are made available under the terms of the Eclipse Public License v1.0 |
| * which accompanies this distribution, and is available at |
| * http://www.eclipse.org/legal/epl-v10.html |
| * |
| * 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; |
| |
| } |
| } |