/*
    * 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.myfaces.config.annotation;
  
  import java.lang.reflect.InvocationTargetException;
  import java.lang.reflect.Method;
  import java.lang.reflect.Modifier;
  
  import javax.annotation.PostConstruct;
  import javax.annotation.PreDestroy;
  import javax.naming.NamingException;
  
  import org.apache.myfaces.shared_impl.util.ClassUtils;
  
  /**
   * See SRV.14.5 Servlet Specification Version 2.5 JSR 154
   * and Common Annotations for the Java Platform JSR 250
  
   */
  
  public class NoInjectionAnnotationLifecycleProvider implements LifecycleProvider2
  {
  
  
      public Object newInstance(String className)
             throws InstantiationException, IllegalAccessException, NamingException, InvocationTargetException, ClassNotFoundException
      {
          Class clazz = ClassUtils.classForName(className);
          Object object = clazz.newInstance();
          processAnnotations(object);
          //postConstruct(object);
          return object;
      }
  
      /**
       * Call postConstruct method on the specified instance.
       */
      public void postConstruct(Object instance)
              throws IllegalAccessException, InvocationTargetException
      {
  
          // TODO the servlet spec is not clear about searching in superclass??
  
          Method[] methods = instance.getClass().getDeclaredMethods();
          Method postConstruct = null;
          for (Method method : methods)
          {
              if (method.isAnnotationPresent(PostConstruct.class))
              {
                  // a method that does not take any arguments
                  // the method must not be static
                  // must not throw any checked expections
                  // the return value must be void
                  // the method may be public, protected, package private or private
  
                  if ((postConstruct != null)
                          || (method.getParameterTypes().length != 0)
                          || (Modifier.isStatic(method.getModifiers()))
                          || (method.getExceptionTypes().length > 0)
                          || (!method.getReturnType().getName().equals("void")))
                  {
                      throw new IllegalArgumentException("Invalid PostConstruct annotation");
                  }
                  postConstruct = method;
              }
          }
  
          invokeAnnotatedMethod(postConstruct, instance);
  
      }
  
      public void destroyInstance(Object instance)
              throws IllegalAccessException, InvocationTargetException
      {
  
          // TODO the servlet spec is not clear about searching in superclass??
          // May be only check non private fields and methods
          Method[] methods = instance.getClass().getDeclaredMethods();
          Method preDestroy = null;
          for (Method method : methods)
          {
              if (method.isAnnotationPresent(PreDestroy.class))
              {
                 // must not throw any checked expections
                 // the method must not be static
                 // must not throw any checked expections
                 // the return value must be void
                 // the method may be public, protected, package private or private
 
                 if ((preDestroy != null)
                         || (method.getParameterTypes().length != 0)
                         || (Modifier.isStatic(method.getModifiers()))
                         || (method.getExceptionTypes().length > 0)
                         || (!method.getReturnType().getName().equals("void")))
                 {
                     throw new IllegalArgumentException("Invalid PreDestroy annotation");
                 }
                 preDestroy = method;
             }
         }
 
         invokeAnnotatedMethod(preDestroy, instance);
 
     }
 
     private void invokeAnnotatedMethod(Method method, Object instance)
                 throws IllegalAccessException, InvocationTargetException
     {
         // At the end the annotated
         // method is invoked
         if (method != null)
         {
             boolean accessibility = method.isAccessible();
             method.setAccessible(true);
             method.invoke(instance);
             method.setAccessible(accessibility);
         }
     }
 
      /**
      * Inject resources in specified instance.
      */
     protected void processAnnotations(Object instance)
             throws IllegalAccessException, InvocationTargetException, NamingException
     {
 
     }
 
 }