/*

  * 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.cdi.util;

 import java.util.Set;

 import javax.enterprise.context.Dependent;

 import javax.enterprise.context.spi.CreationalContext;

 import javax.enterprise.inject.spi.Bean;

 import javax.enterprise.inject.spi.BeanManager;

 import javax.faces.context.ExternalContext;

 import javax.faces.context.FacesContext;

 import javax.faces.convert.Converter;

 import javax.faces.validator.Validator;

 import org.apache.myfaces.cdi.dependent.AbstractBeanStorage;

 import org.apache.myfaces.cdi.dependent.DependentBeanEntry;

 import org.apache.myfaces.cdi.dependent.RequestDependentBeanStorage;

 import org.apache.myfaces.shared.config.MyfacesConfig;

 import org.apache.myfaces.util.ExternalSpecifications;

 /**

  *

  */

 public class CDIExternalArtifactResolver extends ExternalArtifactResolver

 {

     public static final String JAVAX_FACES_CONVERT_PACKAGE_NAME = "javax.faces.convert";

     public static final String JAVAX_FACES_VALIDATOR_PACKAGE_NAME = "javax.faces.validator";

     private Boolean managedConvertersEnabled;

     private Boolean managedValidatorsEnabled;

     public CDIExternalArtifactResolver()

     {

         initConverterInjectionEnabled();

         initValidatorInjectionEnabled();

     }

     private boolean isManagedConvertersEnabled()

     {

         if (managedConvertersEnabled != null)

         {

             return managedConvertersEnabled;

         }

         //initConverterInjectionEnabled();

         return managedConvertersEnabled;

     }

     private void initConverterInjectionEnabled()

     {

         if (managedConvertersEnabled != null)

         {

             return;

         }

         managedConvertersEnabled = MyfacesConfig.getCurrentInstance(

                 FacesContext.getCurrentInstance().getExternalContext()).isCdiManagedConvertersEnabled();

     }

     public Converter resolveManagedConverter(Class<? extends Converter> converterClass)

     {

         if (!isManagedConvertersEnabled())

         {

             return null;

         }

         ExternalContext externalContext = FacesContext.getCurrentInstance().getExternalContext();

         if (!ExternalSpecifications.isCDIAvailable(externalContext) ||

                 JAVAX_FACES_CONVERT_PACKAGE_NAME.equals(converterClass.getPackage().getName()))

         {

             return null;

         }

         BeanManager beanManager = CDIUtils.getBeanManager(externalContext);

         return getContextualReference(beanManager, converterClass);

     }

     private boolean isManagedValidatorsEnabled()

     {

         if (managedValidatorsEnabled != null)

         {

             return managedValidatorsEnabled;

         }

         //initValidatorInjectionEnabled();

         return managedValidatorsEnabled;

     }

     private void initValidatorInjectionEnabled()

     {

         if (managedValidatorsEnabled != null)

         {

             return;

         }

         managedValidatorsEnabled = MyfacesConfig.getCurrentInstance(

                 FacesContext.getCurrentInstance().getExternalContext()).isCdiManagedValidatorsEnabled();

     }

     public Validator resolveManagedValidator(Class<? extends Validator> validatorClass)

     {

         if (!isManagedValidatorsEnabled())

         {

             return null;

         }

         ExternalContext externalContext = FacesContext.getCurrentInstance().getExternalContext();

         if (!ExternalSpecifications.isCDIAvailable(externalContext) ||

                 JAVAX_FACES_VALIDATOR_PACKAGE_NAME.equals(validatorClass.getPackage().getName()))

         {

             return null;

         }

         BeanManager beanManager = CDIUtils.getBeanManager(externalContext);

         return getContextualReference(beanManager, validatorClass);

     }

     private static <T> T getContextualReference(BeanManager beanManager, Class<T> type)

     {

         Set<Bean<?>> beans = beanManager.getBeans(type);

         if (beans == null || beans.isEmpty())

         {

             return null;

         }

         Bean<?> bean = beanManager.resolve(beans);

         CreationalContext<?> creationalContext = beanManager.createCreationalContext(bean);

         @SuppressWarnings({ "unchecked", "UnnecessaryLocalVariable" })

         T result = (T) beanManager.getReference(bean, type, creationalContext);

         if (bean.getScope().equals(Dependent.class))

         {

             //TODO add serializable check again or remove this TODO once MYFACES-3805 is clarified

             AbstractBeanStorage beanStorage = getContextualReference(beanManager, RequestDependentBeanStorage.class);

             //noinspection unchecked

             beanStorage.add(new DependentBeanEntry(result, bean, creationalContext));

         }

         return result;

     }

 }