/*
    * 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 javax.faces.component.StateHolder;
  import javax.faces.component.html.HtmlDataTable;
  import javax.faces.context.FacesContext;
  import javax.faces.event.ActionEvent;
  import javax.faces.event.ActionListener;
  import javax.servlet.http.HttpServletResponse;
  
  import org.apache.commons.logging.Log;
  import org.apache.commons.logging.LogFactory;
  import org.apache.myfaces.commons.exporter.util.ComponentUtils;
  import org.apache.myfaces.commons.exporter.util.ExcelExporterUtil;
  import org.apache.myfaces.commons.exporter.util.ExporterConstants;
  import org.apache.myfaces.commons.exporter.util.PDFExporterUtil;
  
  /**
   *
   * This class is acting as the Exporter ActionListener.
   */
  public class ExporterActionListener implements ActionListener, StateHolder
  {
  
      private static final Log log = LogFactory
              .getLog(ExporterActionListener.class);
  
      public static final String FILENAME_KEY = "filename";
  
      public static final String FILE_TYPE_KEY = "fileType";
  
      public static final String FOR_KEY = "for";
  
      private String _fileType;
  
      private String _fileName;
  
      private String _for;
  
      public ExporterActionListener() 
      {
      }
  
      public ExporterActionListener(String _for, String _fileType,
              String _fileName)
      {
          this._fileType = _fileType;
          this._fileName = _fileName;
          this._for = _for;
      }
  
      public void processAction(ActionEvent event)
      {
          FacesContext facesContext = FacesContext.getCurrentInstance();
          Object response = facesContext.getExternalContext().getResponse();
  
          if (!(response instanceof HttpServletResponse))
          {
              log.error("ExporteActionListener requires servlet");
          }
          else
          {
              try
              {
  
                  /* get the source dataTable component */
                  HtmlDataTable dataTable = (HtmlDataTable) ComponentUtils
                          .findComponentById(facesContext, facesContext
                                  .getViewRoot(), _for);
  
                  if (!(dataTable instanceof HtmlDataTable))
                  {
                      throw new RuntimeException(
                              "exporterActionListener for attribute should contain a "
                                      + "dataTable component id");
                  }
  
                  if (ExporterConstants.EXCEL_FILE_TYPE
                          .equalsIgnoreCase(_fileType))
                  {
  
                      /*
                      * Excel case. Generate the XLS to the response stream.
                      */
                     Object contextResponse = facesContext.getExternalContext()
                             .getResponse();
 
                     if (contextResponse instanceof HttpServletResponse)
                     {
                         ExcelExporterUtil.generateEXCEL(facesContext,
                                 (HttpServletResponse) contextResponse,
                                 _fileName, dataTable);
                     }
 
                 }
                 else
                 {
 
                     /*
                      * PDF case. Generate the PDF to the response stream.
                      */
                     HttpServletResponse httpResponse = (HttpServletResponse) facesContext
                             .getExternalContext().getResponse();
 
                     PDFExporterUtil.generatePDF(facesContext, httpResponse,
                             _fileName, dataTable);
                 }
 
                 /* save the seralized view and complete the response. */
                 facesContext.getApplication().getStateManager()
                         .saveSerializedView(facesContext);
                 facesContext.responseComplete();
             }
             catch (Exception exception)
             {
                 throw new RuntimeException(exception);
             }
 
         }
 
         facesContext.responseComplete();
     }
 
     public String getFilename()
     {
         return _fileName;
     }
 
     public void setFilename(String _filename)
     {
         this._fileName = _filename;
     }
 
     public String getFileType()
     {
         return _fileType;
     }
 
     public void setFileType(String type)
     {
         _fileType = type;
     }
 
     public String getFor()
     {
         return _for;
     }
 
     public void setFor(String _for)
     {
         this._for = _for;
     }
 
     public void restoreState(FacesContext context, Object state)
     {
         String values[] = (String[]) state;
 
         _for = values[0];
         _fileName = values[1];
         _fileType = values[2];
     }
 
     public Object saveState(FacesContext context)
     {
         String values[] = new String[3];
 
         values[0] = _for;
         values[1] = _fileName;
         values[2] = _fileType;
         return ((String[]) values);
     }
 
     public boolean isTransient()
     {
         return false;
     }
 
     public void setTransient(boolean newTransientValue)
     {
         if (newTransientValue == true)
         {
             throw new IllegalArgumentException();
         }
     }
 }