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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.contribution;
import java.lang.reflect.Constructor;
import java.lang.reflect.Method;
import java.util.HashMap;
import org.apache.tuscany.sca.contribution.util.ServiceDiscovery;
/**
* Default implementation of a model factory extension point.
*
* @version $Rev$ $Date$
*/
public class DefaultModelFactoryExtensionPoint implements ModelFactoryExtensionPoint {
private HashMap<Class<?>, Object> factories = new HashMap<Class<?>, Object>();
public DefaultModelFactoryExtensionPoint() {
}
/**
* Add a model factory extension.
*
* @param factory The factory to add
*/
public void addFactory(Object factory) {
Class[] interfaces = factory.getClass().getInterfaces();
if (interfaces.length == 0) {
Class<?> sc = factory.getClass().getSuperclass();
if (sc != Object.class) {
factories.put(sc, factory);
}
} else {
for (int i = 0; i<interfaces.length; i++) {
factories.put(interfaces[i], factory);
}
}
}
/**
* Remove a model factory extension.
*
* @param factory The factory to remove
*/
public void removeFactory(Object factory) {
Class[] interfaces = factory.getClass().getInterfaces();
if (interfaces.length == 0) {
Class<?> sc = factory.getClass().getSuperclass();
if (sc != Object.class) {
factories.remove(sc);
}
} else {
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) {
Object factory = factories.get(factoryInterface);
if (factory == null) {
if (factoryInterface.isInterface()) {
// Dynamically load a factory class declared under META-INF/services
try {
Class<?> factoryClass = ServiceDiscovery.getInstance().loadFirstServiceClass(factoryInterface);
if (factoryClass != null) {
try {
// Default empty constructor
Constructor<?> constructor = factoryClass.getConstructor();
factory = constructor.newInstance();
} catch (NoSuchMethodException e) {
// Constructor taking the model factory extension point
Constructor<?> constructor = factoryClass.getConstructor(ModelFactoryExtensionPoint.class);
factory = constructor.newInstance(this);
}
// Cache the loaded factory
addFactory(factory);
}
} catch (Exception e) {
throw new IllegalArgumentException(e);
}
} else {
// Call the newInstance static method on the factory abstract class
try {
Method newInstanceMethod = factoryInterface.getMethod("newInstance");
factory = newInstanceMethod.invoke(null);
} catch (Exception e) {
throw new IllegalArgumentException(e);
}
// Cache the factory
addFactory(factory);
}
}
return factoryInterface.cast(factory);
}
}
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