/*

  * 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.spi.impl;

 import javax.faces.context.ExternalContext;

 import org.apache.myfaces.shared.util.ClassUtils;

 import org.apache.myfaces.spi.InjectionProvider;

 import org.apache.myfaces.spi.InjectionProviderException;

 import org.apache.myfaces.util.ExternalSpecifications;

 /**

  * Delegation pattern to avoid direct instantiation

  */

 public class CDIAnnotationDelegateInjectionProvider extends InjectionProvider

 {

     private InjectionProvider delegate;

     private final boolean available;

     public CDIAnnotationDelegateInjectionProvider(ExternalContext externalContext)

     {

         if (ExternalSpecifications.isCDIAvailable(externalContext))

         {

             try

             {

                 Class clazz = ClassUtils.simpleClassForName(

                     "org.apache.myfaces.cdi.impl.CDIAnnotationInjectionProvider");

                 delegate = (InjectionProvider) clazz.getConstructor(

                     ExternalContext.class).newInstance(externalContext);

             }

             catch(Exception e)

             {

                 //Ignore

             }

         }

         available = (delegate != null);

     }

     @Override

     public Object inject(Object instance) throws InjectionProviderException

     {

         if (available)

         {

             return delegate.inject(instance);

         }

         return null;

     }

     @Override

     public void postConstruct(Object instance, Object creationMetaData) throws InjectionProviderException

     {

         if (available)

         {

             delegate.postConstruct(instance, creationMetaData);

         }

     }

     @Override

     public void preDestroy(Object instance, Object creationMetaData) throws InjectionProviderException

     {

         if (available)

         {

             delegate.preDestroy(instance, creationMetaData);

         }

     }

     @Override

     public boolean isAvailable()

     {

         return available;

     }

 }