/*

  * 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 javax.faces.convert;

 import javax.el.ValueExpression;

 import javax.faces.FacesException;

 import javax.faces.application.FacesMessage;

 import javax.faces.component.UIComponent;

 import javax.faces.context.FacesContext;

 import java.security.AccessController;

 import java.security.PrivilegedActionException;

 import java.security.PrivilegedExceptionAction;

 import java.util.Locale;

 import java.util.MissingResourceException;

 import java.util.ResourceBundle;

 class _MessageUtils

 {

     private static final String DETAIL_SUFFIX = "_detail";

     static FacesMessage getErrorMessage(FacesContext facesContext,

                                         String messageId,

                                         Object args[])

     {

         return getMessage(facesContext,

                           facesContext.getViewRoot().getLocale(),

                           FacesMessage.SEVERITY_ERROR,

                           messageId,

                           args);

     }

     static FacesMessage getMessage(FacesContext facesContext,

                                    Locale locale,

                                    FacesMessage.Severity severity,

                                    String messageId,

                                    Object args[])

     {

         ResourceBundle appBundle;

         ResourceBundle defBundle;

         String summary;

         String detail;

         appBundle = getApplicationBundle(facesContext, locale);

         summary = getBundleString(appBundle, messageId);

         if (summary != null)

         {

             detail = getBundleString(appBundle, messageId + DETAIL_SUFFIX);

         }

         else

         {

             defBundle = getDefaultBundle(facesContext, locale);

             summary = getBundleString(defBundle, messageId);

             if (summary != null)

             {

                 detail = getBundleString(defBundle, messageId + DETAIL_SUFFIX);

             }

             else

             {

                 //Try to find detail alone

                 detail = getBundleString(appBundle, messageId + DETAIL_SUFFIX);

                 if (detail != null)

                 {

                     summary = null;

                 }

                 else

                 {

                     detail = getBundleString(defBundle, messageId + DETAIL_SUFFIX);

                     if (detail != null)

                     {

                         summary = null;

                     }

                     else

                     {

                         //Neither detail nor summary found

                         facesContext.getExternalContext().log("No message with id " + messageId

                                                               + " found in any bundle");

                         return new FacesMessage(severity, messageId, null);

                     }

                 }

             }

         }

         if (args != null && args.length > 0)

         {

             return new _ParametrizableFacesMessage(severity, summary, detail, args, locale);

         }

         else

         {

             return new FacesMessage(severity, summary, detail);

         }

     }

     private static String getBundleString(ResourceBundle bundle, String key)

     {

         try

         {

             return bundle == null ? null : bundle.getString(key);

         }

         catch (MissingResourceException e)

         {

             return null;

         }

     }

     private static ResourceBundle getApplicationBundle(FacesContext facesContext, Locale locale)

     {

         String bundleName = facesContext.getApplication().getMessageBundle();

         return bundleName != null ? getBundle(facesContext, locale, bundleName) : null;

     }

     private static ResourceBundle getDefaultBundle(FacesContext facesContext,

                                                    Locale locale)

     {

         return getBundle(facesContext, locale, FacesMessage.FACES_MESSAGES);

     }

     private static ResourceBundle getBundle(FacesContext facesContext,

                                             Locale locale,

                                             String bundleName)

     {

         try

         {

             //First we try the JSF implementation class loader

             return ResourceBundle.getBundle(bundleName,

                                             locale,

                                             facesContext.getClass().getClassLoader());

         }

         catch (MissingResourceException ignore1)

         {

             try

             {

                 //Next we try the JSF API class loader

                 return ResourceBundle.getBundle(bundleName,

                                                 locale,

                                                 _MessageUtils.class.getClassLoader());

             }

             catch (MissingResourceException ignore2)

             {

                 try

                 {

                     //Last resort is the context class loader

                     if (System.getSecurityManager() != null)

                     {

                         Object cl = AccessController.doPrivileged(new PrivilegedExceptionAction()

                         {

                             public Object run() throws PrivilegedActionException

                             {

                                 return Thread.currentThread().getContextClassLoader();

                             }

                         });

                         return ResourceBundle.getBundle(bundleName,locale,(ClassLoader)cl);

                     }

                     else

                     {

                         return ResourceBundle.getBundle(bundleName,locale,

                                                         Thread.currentThread().getContextClassLoader());

                     }                   

                 }

                 catch(PrivilegedActionException pae)

                 {

                     throw new FacesException(pae);

                 }

                 catch (MissingResourceException damned)

                 {

                     facesContext.getExternalContext().log("resource bundle " + bundleName + " could not be found");

                     return null;

                 }

             }

         }

     }

     static Object getLabel(FacesContext facesContext, UIComponent component)

     {

         Object label = component.getAttributes().get("label");

         ValueExpression expression = null;

         if (label != null && 

             label instanceof String && ((String)label).length() == 0 )

         {

             // Note component.getAttributes().get("label") internally try to 

             // evaluate the EL expression for the label, but in some cases, 

             // when PSS is disabled and f:loadBundle is used, when the view is 

             // restored the bundle is not set to the EL expression returns an 

             // empty String. It is not possible to check if there is a 

             // hardcoded label, but we can check if there is

             // an EL expression set, so the best in this case is use that, and if

             // there is an EL expression set, use it, otherwise use the hardcoded

             // value. See MYFACES-3591 for details.

             expression = component.getValueExpression("label");

             if (expression != null)

             {

                 // Set the label to null and use the EL expression instead.

                 label = null;

             }

         }

         if(label != null)

         {

             return label;

         }

         expression = (expression == null) ? component.getValueExpression("label") : expression;

         if(expression != null)

         {

             return expression;

         }

         //If no label is not specified, use clientId

         return component.getClientId( facesContext );

     }

 }