trunk_failed_1.0_release/extscript-core-root/extscript-core/src/main/java/org/apache/myfaces/extensions/scripting/api/extensionevents/ExtensionEventRegistry.java

/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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.apache.myfaces.extensions.scripting.api.extensionevents;

import java.util.Collection;
import java.util.Iterator;
import java.util.concurrent.ConcurrentLinkedQueue;

/**
 * @author Werner Punz (latest modification by $Author$)
 * @version $Revision$ $Date$
 */

public class ExtensionEventRegistry {

    Collection<ExtensionEventListener> _listeners = new ConcurrentLinkedQueue<ExtensionEventListener>();

    public void addListener(ExtensionEventListener listener) {
        _listeners.add(listener);
    }

    public void removeListener(ExtensionEvent listener) {
        _listeners.remove(listener);
    }

    public void removeAllListeners(Class eventType) {
        Iterator<ExtensionEventListener> it = _listeners.iterator();
        while (it.hasNext()) {
            if (it.next().getClass() == eventType) {
                it.remove();
            }
        }
    }

    public void clear() {
        _listeners.clear();
    }

    public void sendEvent(ExtensionEvent evt) {
        for (ExtensionEventListener listener : _listeners) {
            if (listener.isListenerFor(evt)) {
                listener.handleEvent(evt);
            }
        }
    }

}