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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.tuscany.sca.context;
import java.lang.reflect.Constructor;
import java.util.HashMap;
import org.apache.tuscany.sca.core.ExtensionPointRegistry;
import org.apache.tuscany.sca.extensibility.ServiceDeclaration;
/**
* Default implementation of a model factory extension point.
*
* @version $Rev$ $Date$
*/
public class DefaultContextFactoryExtensionPoint implements ContextFactoryExtensionPoint {
/**
* The Map of Factories that have been registered.
*/
private HashMap<Class<?>, Object> factories = new HashMap<Class<?>, Object>();
private ExtensionPointRegistry registry;
public DefaultContextFactoryExtensionPoint(ExtensionPointRegistry registry) {
this.registry = registry;
}
/**
* Add a model factory extension.
*
* @param factory The factory to add.
* @throws IllegalArgumentException if factory is null
*/
public void addFactory(Object factory) throws IllegalArgumentException {
if (factory == null) {
throw new IllegalArgumentException("Cannot add null as a factory");
}
Class<?>[] interfaces = factory.getClass().getInterfaces();
for (int i = 0; i<interfaces.length; i++) {
factories.put(interfaces[i], factory);
}
}
/**
* Remove a model factory extension.
*
* @param factory The factory to remove
* @throws IllegalArgumentException if factory is null
*/
public void removeFactory(Object factory) throws IllegalArgumentException {
if (factory == null) {
throw new IllegalArgumentException("Cannot remove null as a factory");
}
Class<?>[] interfaces = factory.getClass().getInterfaces();
for (int i = 0; i<interfaces.length; i++) {
factories.remove(interfaces[i]);
}
}
/**
* Get a factory implementing the given interface.
*
* @param factoryInterface The lookup key (factory interface)
* @return The factory
*/
public <T> T getFactory(Class<T> factoryInterface) throws IllegalArgumentException {
if (factoryInterface == null) {
throw new IllegalArgumentException("Cannot get null as a factory");
}
Object factory = factories.get(factoryInterface);
if (factory == null) {
// Dynamically load a factory class declared under META-INF/services
try {
ServiceDeclaration factoryDeclaration = registry.getServiceDiscovery().getServiceDeclaration(factoryInterface.getName());
if (factoryDeclaration != null) {
Class<?> factoryClass = factoryDeclaration.loadClass();
// Default empty constructor
Constructor<?> constructor = factoryClass.getConstructor(ExtensionPointRegistry.class);
factory = constructor.newInstance(registry);
// Cache the loaded factory
addFactory(factory);
}
} catch (Exception e) {
throw new IllegalArgumentException(e);
}
}
return factoryInterface.cast(factory);
}
}
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