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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.plugin;
import java.util.Collections;
import java.util.HashMap;
import java.util.Map;
import java.util.Set;
import java.util.TreeSet;
public class PluggableFactoryLoader<T extends Pluggable>
{
private final Map<String, T> _factoriesMap;
private final Set<String> _types;
public PluggableFactoryLoader(Class<T> factoryClass)
{
Map<String, T> fm = new HashMap<String, T>();
QpidServiceLoader<T> qpidServiceLoader = new QpidServiceLoader<T>();
Iterable<T> factories = qpidServiceLoader.atLeastOneInstanceOf(factoryClass);
for (T factory : factories)
{
String descriptiveType = factory.getType();
if (fm.containsKey(descriptiveType))
{
throw new IllegalStateException(factoryClass.getSimpleName() + " with type name '" + descriptiveType
+ "' is already registered using class '" + fm.get(descriptiveType).getClass().getName()
+ "', can not register class '" + factory.getClass().getName() + "'");
}
fm.put(descriptiveType, factory);
}
_factoriesMap = Collections.unmodifiableMap(fm);
_types = Collections.unmodifiableSortedSet(new TreeSet<String>(_factoriesMap.keySet()));
}
public T get(String type)
{
return _factoriesMap.get(type);
}
public Set<String> getSupportedTypes()
{
return _types;
}
}
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