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Diffstat (limited to '')
-rw-r--r-- | sandbox/event/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/DefaultModelFactoryExtensionPoint.java | 130 |
1 files changed, 130 insertions, 0 deletions
diff --git a/sandbox/event/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/DefaultModelFactoryExtensionPoint.java b/sandbox/event/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/DefaultModelFactoryExtensionPoint.java new file mode 100644 index 0000000000..b69c58a0ff --- /dev/null +++ b/sandbox/event/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/DefaultModelFactoryExtensionPoint.java @@ -0,0 +1,130 @@ +/* + * 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.util.HashMap; + +import org.apache.tuscany.sca.extensibility.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>(); + + /** + * Constructs a new DefaultModelFactoryExtensionPoint. + */ + 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. + * + * @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 { + factory = ServiceDiscovery.getInstance().newFactoryClassInstance(factoryInterface); + } catch (Exception e) { + throw new IllegalArgumentException(e); + } + + // Cache the factory + addFactory(factory); + } + } + return factoryInterface.cast(factory); + } + +} |