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Diffstat (limited to '')
-rw-r--r-- | sandbox/ant/sca/trunk/modules/extensibility/src/main/java/org/apache/tuscany/sca/core/DefaultUtilityExtensionPoint.java | 186 |
1 files changed, 0 insertions, 186 deletions
diff --git a/sandbox/ant/sca/trunk/modules/extensibility/src/main/java/org/apache/tuscany/sca/core/DefaultUtilityExtensionPoint.java b/sandbox/ant/sca/trunk/modules/extensibility/src/main/java/org/apache/tuscany/sca/core/DefaultUtilityExtensionPoint.java deleted file mode 100644 index 07b058ebcc..0000000000 --- a/sandbox/ant/sca/trunk/modules/extensibility/src/main/java/org/apache/tuscany/sca/core/DefaultUtilityExtensionPoint.java +++ /dev/null @@ -1,186 +0,0 @@ -/* - * 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.core; - -import java.io.IOException; -import java.lang.reflect.Constructor; -import java.lang.reflect.InvocationTargetException; -import java.lang.reflect.Modifier; -import java.util.HashMap; -import java.util.HashSet; -import java.util.Map; -import java.util.Set; - -import org.apache.tuscany.sca.extensibility.ServiceDeclaration; -import org.apache.tuscany.sca.extensibility.ServiceDiscovery; - -/** - * Default implementation of an extension point to hold Tuscany utility utilities. - * - * @version $Rev$ $Date$ - */ -public class DefaultUtilityExtensionPoint implements UtilityExtensionPoint { - private Map<Class<?>, Object> utilities = new HashMap<Class<?>, Object>(); - - private ExtensionPointRegistry extensionPoints; - - /** - * Constructs a new extension point. - */ - public DefaultUtilityExtensionPoint(ExtensionPointRegistry extensionPoints) { - this.extensionPoints = extensionPoints; - } - - /** - * Add a utility to the extension point. This default implementation - * stores utilities against the interfaces that they implement. - * - * @param utility The instance of the utility - * - * @throws IllegalArgumentException if utility is null - */ - public void addUtility(Object utility) { - if (utility == null) { - throw new IllegalArgumentException("Cannot register null as a Service"); - } - - Set<Class<?>> interfaces = getAllInterfaces(utility.getClass()); - for (Class<?> i : interfaces) { - utilities.put(i, utility); - } - } - - private Constructor<?> getConstructor(Constructor<?>[] constructors, Class<?>[] paramTypes) { - for (Constructor<?> c : constructors) { - Class<?>[] types = c.getParameterTypes(); - if (c.getParameterTypes().length == paramTypes.length) { - boolean found = true; - for (int i = 0; i < types.length; i++) { - if (types[i] != paramTypes[i]) { - found = false; - break; - } - } - if (found) { - return c; - } - } - } - return null; - } - - /** - * Get the utility by the interface that it implements - * - * @param utilityType The lookup key (utility interface) - * @return The instance of the utility - * - * @throws IllegalArgumentException if utilityType is null - */ - public <T> T getUtility(Class<T> utilityType) { - if (utilityType == null) { - throw new IllegalArgumentException("Cannot lookup Service of type null"); - } - - Object utility = utilities.get(utilityType); - if (utility == null) { - - // Dynamically load a utility class declared under META-INF/services/"utilityType" - try { - ServiceDeclaration utilityDeclaration =ServiceDiscovery.getInstance().getFirstServiceDeclaration(utilityType.getName()); - if (utilityDeclaration != null) { - Class<?> utilityClass = utilityDeclaration.loadClass(); - - // Construct the utility - Constructor<?>[] constructors = utilityClass.getConstructors(); - Constructor<?> constructor = getConstructor(constructors, new Class<?>[] {ExtensionPointRegistry.class}); - if (constructor != null) { - utility = constructor.newInstance(extensionPoints); - } else { - constructor = getConstructor(constructors, new Class<?>[] {}); - if (constructor != null) { - utility = constructor.newInstance(); - } else { - throw new IllegalArgumentException( - "No valid constructor is found for " + utilityClass); - } - } - - // Cache the loaded utility - addUtility(utility); - } - } catch (InvocationTargetException e) { - throw new IllegalArgumentException(e); - } catch (IOException e) { - throw new IllegalArgumentException(e); - } catch (ClassNotFoundException e) { - throw new IllegalArgumentException(e); - } catch (InstantiationException e) { - throw new IllegalArgumentException(e); - } catch (IllegalAccessException e) { - throw new IllegalArgumentException(e); - } - } - return utilityType.cast(utility); - } - - /** - * Remove a utility based on the interface that it implements - * - * @param utility The utility to remove - * - * @throws IllegalArgumentException if utility is null - */ - public void removeUtility(Object utility) { - if (utility == null) { - throw new IllegalArgumentException("Cannot remove null as a Service"); - } - - Set<Class<?>> interfaces = getAllInterfaces(utility.getClass()); - for (Class<?> i : interfaces) { - utilities.remove(i); - } - } - - /** - * Returns the set of interfaces implemented by the given class and its - * ancestors or a blank set if none - */ - private static Set<Class<?>> getAllInterfaces(Class<?> clazz) { - Set<Class<?>> implemented = new HashSet<Class<?>>(); - getAllInterfaces(clazz, implemented); - return implemented; - } - - private static void getAllInterfaces(Class<?> clazz, Set<Class<?>> implemented) { - Class<?>[] interfaces = clazz.getInterfaces(); - for (Class<?> interfaze : interfaces) { - if (Modifier.isPublic(interfaze.getModifiers())) { - implemented.add(interfaze); - } - } - Class<?> superClass = clazz.getSuperclass(); - // Object has no superclass so check for null - if (superClass != null && !superClass.equals(Object.class)) { - getAllInterfaces(superClass, implemented); - } - } - -} |