/*
* Created on Mar 22, 2008
*
* 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.
*
* Copyright @2008-2013 the original author or authors.
*/
package org.fest.swing.monitor;
import static org.fest.util.Maps.newWeakHashMap;
import static org.fest.util.Sets.newHashSet;
import java.awt.Component;
import java.awt.EventQueue;
import java.lang.ref.WeakReference;
import java.util.Collection;
import java.util.Map;
import java.util.Set;
import javax.annotation.Nonnull;
import javax.annotation.Nullable;
import org.fest.swing.annotation.RunsInCurrentThread;
/**
* A mapping of AWT or Swing {@code Component}s, and their respective {@link EventQueue}.
*
* @author Yvonne Wang
* @author Alex Ruiz
*/
class EventQueueMapping {
final Map<Component, WeakReference<EventQueue>> queueMap = newWeakHashMap();
@RunsInCurrentThread
void addQueueFor(@Nonnull Component c) {
EventQueue queue = c.getToolkit().getSystemEventQueue();
queueMap.put(c, new WeakReference<EventQueue>(queue));
}
@RunsInCurrentThread
@Nullable EventQueue queueFor(@Nonnull Component c) {
EventQueue queue = storedQueueFor(c);
if (queue == null) {
return c.getToolkit().getSystemEventQueue();
}
return queue;
}
@Nullable EventQueue storedQueueFor(@Nonnull Component c) {
return queueFrom(queueMap.get(c));
}
@Nonnull Collection<EventQueue> eventQueues() {
Set<EventQueue> eventQueues = newHashSet();
for (WeakReference<EventQueue> reference : queueMap.values()) {
EventQueue queue = queueFrom(reference);
if (queue != null) {
eventQueues.add(queue);
}
}
return eventQueues;
}
private @Nullable EventQueue queueFrom(@Nullable WeakReference<EventQueue> reference) {
if (reference == null) {
return null;
}
return reference.get();
}
}