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/*
*
* 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.qpid.server.model;
import java.util.HashMap;
import java.util.Map;
/**
* A type of event generated by a ConfiguredObject.
*/
public abstract class EventType<T extends EventType<T>>
{
private static final Map<Class<? extends EventType>, Integer> EVENT_TYPES =
new HashMap<Class<? extends EventType>, Integer>();
private final int _classId;
protected EventType()
{
synchronized (EVENT_TYPES)
{
if(EVENT_TYPES.containsKey(getClass()))
{
throw new IllegalArgumentException("Cannot define more one instance of the same EventType " +
getClass().getName());
}
else
{
_classId = EVENT_TYPES.size();
EVENT_TYPES.put(getClass(), _classId);
}
}
}
public final int getId()
{
return _classId;
}
abstract public Event<T> newEvent();
}
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