| /* |
| * 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.naming.factory; |
| |
| import java.util.Hashtable; |
| |
| import javax.naming.Context; |
| import javax.naming.Name; |
| import javax.naming.NamingException; |
| import javax.naming.RefAddr; |
| import javax.naming.Reference; |
| import javax.naming.spi.ObjectFactory; |
| |
| /** |
| * Abstract base class that provides common functionality required by |
| * sub-classes. This class exists primarily to reduce code duplication. |
| */ |
| public abstract class FactoryBase implements ObjectFactory { |
| |
| /** |
| * Creates a new object instance. |
| * |
| * @param obj The reference object describing the object to create |
| */ |
| @Override |
| public final Object getObjectInstance(Object obj, Name name, Context nameCtx, |
| Hashtable<?,?> environment) throws Exception { |
| |
| if (isReferenceTypeSupported(obj)) { |
| Reference ref = (Reference) obj; |
| |
| Object linked = getLinked(ref); |
| if (linked != null) { |
| return linked; |
| } |
| |
| ObjectFactory factory = null; |
| RefAddr factoryRefAddr = ref.get(Constants.FACTORY); |
| if (factoryRefAddr != null) { |
| // Using the specified factory |
| String factoryClassName = factoryRefAddr.getContent().toString(); |
| // Loading factory |
| ClassLoader tcl = Thread.currentThread().getContextClassLoader(); |
| Class<?> factoryClass = null; |
| try { |
| if (tcl != null) { |
| factoryClass = tcl.loadClass(factoryClassName); |
| } else { |
| factoryClass = Class.forName(factoryClassName); |
| } |
| } catch(ClassNotFoundException e) { |
| NamingException ex = new NamingException( |
| "Could not load resource factory class"); |
| ex.initCause(e); |
| throw ex; |
| } |
| try { |
| factory = (ObjectFactory) factoryClass.getConstructor().newInstance(); |
| } catch(Throwable t) { |
| if (t instanceof NamingException) { |
| throw (NamingException) t; |
| } |
| if (t instanceof ThreadDeath) { |
| throw (ThreadDeath) t; |
| } |
| if (t instanceof VirtualMachineError) { |
| throw (VirtualMachineError) t; |
| } |
| NamingException ex = new NamingException( |
| "Could not create resource factory instance"); |
| ex.initCause(t); |
| throw ex; |
| } |
| } else { |
| // Check for a default factory |
| factory = getDefaultFactory(ref); |
| } |
| |
| if (factory != null) { |
| return factory.getObjectInstance(obj, name, nameCtx, environment); |
| } else { |
| throw new NamingException("Cannot create resource instance"); |
| } |
| } |
| |
| return null; |
| } |
| |
| |
| /** |
| * Determines if this factory supports processing the provided reference |
| * object. |
| * |
| * @param obj The object to be processed |
| * |
| * @return <code>true</code> if this factory can process the object, |
| * otherwise <code>false</code> |
| */ |
| protected abstract boolean isReferenceTypeSupported(Object obj); |
| |
| /** |
| * If a default factory is available for the given reference type, create |
| * the default factory. |
| * |
| * @param ref The reference object to be processed |
| * |
| * @return The default factory for the given reference object or |
| * <code>null</code> if no default factory exists. |
| * |
| * @throws NamingException If the default factory can not be created |
| */ |
| protected abstract ObjectFactory getDefaultFactory(Reference ref) |
| throws NamingException; |
| |
| /** |
| * If this reference is a link to another JNDI object, obtain that object. |
| * |
| * @param ref The reference object to be processed |
| * |
| * @return The linked object or <code>null</code> if linked objects are |
| * not supported by or not configured for this reference object |
| */ |
| protected abstract Object getLinked(Reference ref) throws NamingException; |
| } |