/*
    * 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.commons.exporter;
  
  import java.io.IOException;
  
  import javax.el.ELException;
  import javax.el.ValueExpression;
  import javax.faces.FacesException;
  import javax.faces.component.ActionSource;
  import javax.faces.component.UIComponent;
  import javax.faces.view.facelets.ComponentHandler;
  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;
  
  /**
   * The (FaceletsExporterActionListenerTag) is responsible for handling the 
   * ExporterActionListener Tag in Facelets.
   */
  public class FaceletsExporterActionListenerTag extends TagHandler
  {
  
      private final TagAttribute _for;
  
      private final TagAttribute _fileType;
  
      private final TagAttribute _fileName;
  
      public FaceletsExporterActionListenerTag(TagConfig tagConfig) 
      {
          super(tagConfig);
          this._for = getRequiredAttribute(ExporterActionListener.FOR_KEY);
          this._fileType = getRequiredAttribute(ExporterActionListener.FILE_TYPE_KEY);
          this._fileName = getRequiredAttribute(ExporterActionListener.FILENAME_KEY);
      }
  
      public void apply(FaceletContext faceletContext, UIComponent parent)
              throws IOException, FacesException, FaceletException, ELException
      {
          if (ComponentHandler.isNew(parent))
          {
              ValueExpression forVE = _for.getValueExpression(faceletContext,
                      Object.class);
              ValueExpression fileTypeVE = _fileType.getValueExpression(
                      faceletContext, Object.class);
              ValueExpression fileNameVE = _fileName.getValueExpression(
                      faceletContext, Object.class);
  
              ActionSource actionSource = (ActionSource) parent;
              actionSource.addActionListener(new ExporterActionListener(
                      (String) forVE.getValue(faceletContext),
                      (String) fileTypeVE.getValue(faceletContext),
                      (String) fileNameVE.getValue(faceletContext)));
          }
      }
  }