package org.apache.turbine.services.jsp.util;

 /*

  * 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.

  */

 import org.apache.commons.logging.Log;

 import org.apache.commons.logging.LogFactory;

 import org.apache.turbine.modules.Screen;

 import org.apache.turbine.modules.ScreenLoader;

 import org.apache.turbine.services.TurbineServices;

 import org.apache.turbine.services.assemblerbroker.AssemblerBrokerService;

 import org.apache.turbine.services.template.TemplateService;

 import org.apache.turbine.util.RunData;

 /**

  * Returns output of a Screen module. An instance of this is placed in the

  * request by the JspLayout. This allows template authors to

  * place the screen template within the layout.<br>

  * Here's how it's used in a JSP template:<br>

  * <code>

  * <%useBean id="screen_placeholder" class="JspScreenPlaceholder" scope="request" %>

  * ...

  * <%= screen_placeholder %>

  * </code>

  *

  * @author <a href="john.mcnally@clearink.com">John D. McNally</a>

  * @author <a href="mailto:hps@intermeta.de">Henning P. Schmiedehausen</a>

  * @version $Id: JspScreenPlaceholder.java 1773378 2016-12-09 13:19:59Z tv $

  */

 public class JspScreenPlaceholder

 {

     /** Logging */

     private static Log log = LogFactory.getLog(JspNavigation.class);

     /* The RunData object */

     private final RunData data;

     private final ScreenLoader screenLoader;

     /**

      * Constructor

      *

      * @param data A Rundata Object

      */

     public JspScreenPlaceholder(RunData data)

     {

         this.data = data;

         AssemblerBrokerService abs = (AssemblerBrokerService)TurbineServices.getInstance()

             .getService(AssemblerBrokerService.SERVICE_NAME);

         this.screenLoader = (ScreenLoader)abs.getLoader(Screen.class);

     }

     /**

      * builds the output of the navigation template

      */

     public void exec()

     {

         String template = null;

         String module = null;

         try

         {

             template = data.getTemplateInfo().getScreenTemplate();

             TemplateService templateService = (TemplateService)TurbineServices.getInstance().getService(TemplateService.SERVICE_NAME);

             module = templateService.getScreenName(template);

             screenLoader.exec(data, module);

         }

         catch (Exception e)

         {

             String message = "Error processing navigation template:" +

                     template + " using module: " + module;

             log.error(message, e);

             try

             {

                 data.getResponse().getWriter().print("Error processing navigation template: "

                         + template + " using module: " + module);

             }

             catch (java.io.IOException ioe)

             {

                 // ignore

             }

         }

     }

 }