/*

  * 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.view.facelets.el;

 import javax.el.ELContext;

 import javax.faces.context.FacesContext;

 import org.apache.myfaces.buildtools.maven2.plugin.builder.annotation.JSFWebConfigParam;

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

 public class ContextAwareUtils

 {

     /**

      * Wrap exception caused by calls to EL expressions, so information like

      * the location, expression string and tag name can be retrieved by

      * the ExceptionHandler implementation and used to output meaningful information about itself.

      * 

      * <p>Note in some cases this will wrap the original javax.el.ELException, so the

      * information will not be on the stack trace unless ExceptionHandler

      * retrieve checking if the exception implements ContextAware interface and calling getWrapped() method.

      * </p>

      * 

      */

     @JSFWebConfigParam(since="2.0.9, 2.1.3" , defaultValue="true", expectedValues="true, false")

     public static final String INIT_PARAM_WRAP_TAG_EXCEPTIONS_AS_CONTEXT_AWARE

             = "org.apache.myfaces.WRAP_TAG_EXCEPTIONS_AS_CONTEXT_AWARE";

     public static boolean isWrapTagExceptionsAsContextAware(ELContext context)

     {

         FacesContext facesContext = (FacesContext) context.getContext(FacesContext.class);

         facesContext = facesContext == null ? FacesContext.getCurrentInstance() : facesContext;

         if (facesContext != null)

         {

             return WebConfigParamUtils.getBooleanInitParameter(facesContext.getExternalContext(),

                     INIT_PARAM_WRAP_TAG_EXCEPTIONS_AS_CONTEXT_AWARE, true);

         }

         else

         {

             //No facesContext, return false

             return false;

         }

     }

 }