/*
    * 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.tag.jstl.core;
  
  import java.io.IOException;
  
  import javax.el.ELException;
  import javax.faces.FacesException;
  import javax.faces.component.UIComponent;
  import javax.faces.view.facelets.FaceletContext;
  import javax.faces.view.facelets.FaceletException;
  import javax.faces.view.facelets.TagAttribute;
  import javax.faces.view.facelets.TagConfig;
  import javax.faces.view.facelets.TagHandler;
  
  import org.apache.myfaces.buildtools.maven2.plugin.builder.annotation.JSFFaceletAttribute;
  import org.apache.myfaces.buildtools.maven2.plugin.builder.annotation.JSFFaceletTag;
  
  /**
   * Catches any Throwable that occurs in its body and optionally 
   * exposes it.
   * 
   * @author Jacob Hookom
   * @version $Id$
   */
  @JSFFaceletTag(name="c:catch")
  public final class CatchHandler extends TagHandler
  {
  
      /**
       * Name of the exported scoped variable for the
       * exception thrown from a nested action. The type of the
       * scoped variable is the type of the exception thrown.
       */
      @JSFFaceletAttribute(className="java.lang.String")
      private final TagAttribute var;
  
      /**
       * @param config
       */
      public CatchHandler(TagConfig config)
      {
          super(config);
          this.var = this.getAttribute("var");
      }
  
      public void apply(FaceletContext ctx, UIComponent parent) throws IOException, FacesException, FaceletException,
              ELException
      {
          try
          {
              this.nextHandler.apply(ctx, parent);
          }
          catch (Exception e)
          {
              if (this.var != null)
              {
                  ctx.setAttribute(this.var.getValue(ctx), e);
              }
          }
      }
  
  }