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    1   package org.apache.turbine.services.jsp.util;
    2
    3
    4   /*
    5    * Licensed to the Apache Software Foundation (ASF) under one
    6    * or more contributor license agreements.  See the NOTICE file
    7    * distributed with this work for additional information
    8    * regarding copyright ownership.  The ASF licenses this file
    9    * to you under the Apache License, Version 2.0 (the
    10   * "License"); you may not use this file except in compliance
    11   * with the License.  You may obtain a copy of the License at
    12   *
    13   *   http://www.apache.org/licenses/LICENSE-2.0
    14   *
    15   * Unless required by applicable law or agreed to in writing,
    16   * software distributed under the License is distributed on an
    17   * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
    18   * KIND, either express or implied.  See the License for the
    19   * specific language governing permissions and limitations
    20   * under the License.
    21   */
    22
    23
    24  import org.apache.commons.logging.Log;
    25  import org.apache.commons.logging.LogFactory;
    26  import org.apache.turbine.modules.Screen;
    27  import org.apache.turbine.modules.ScreenLoader;
    28  import org.apache.turbine.services.assemblerbroker.TurbineAssemblerBroker;
    29  import org.apache.turbine.services.template.TurbineTemplate;
    30  import org.apache.turbine.util.RunData;
    31
    32  /**
    33   * Returns output of a Screen module. An instance of this is placed in the
    34   * request by the JspLayout. This allows template authors to
    35   * place the screen template within the layout.<br>
    36   * Here's how it's used in a JSP template:<br>
    37   * <code>
    38   * <%useBean id="screen_placeholder" class="JspScreenPlaceholder" scope="request"/%>
    39   * ...
    40   * <%= screen_placeholder %>
    41   *</code>
    42   *
    43   * @author <a href="john.mcnally@clearink.com">John D. McNally</a>
    44   * @author <a href="mailto:hps@intermeta.de">Henning P. Schmiedehausen</a>
    45   * @version $Id: JspScreenPlaceholder.java 757213 2009-03-22 16:43:31Z tv $
    46   */
    47  public class JspScreenPlaceholder
    48  {
    49      /** Logging */
    50      private static Log log = LogFactory.getLog(JspNavigation.class);
    51
    52      /* The RunData object */
    53      private RunData data;
    54
    55      private ScreenLoader screenLoader;
    56
    57      /**
    58       * Constructor
    59       *
    60       * @param data A Rundata Object
    61       */
    62      public JspScreenPlaceholder(RunData data)
    63      {
    64          this.data = data;
    65          this.screenLoader = (ScreenLoader)TurbineAssemblerBroker.getLoader(Screen.NAME);
    66      }
    67
    68      /**
    69       * builds the output of the navigation template
    70       */
    71      public void exec()
    72      {
    73          String template = null;
    74          String module = null;
    75          try
    76          {
    77              template = data.getTemplateInfo().getScreenTemplate();
    78              module = TurbineTemplate.getScreenName(template);
    79              screenLoader.exec(data, module);
    80          }
    81          catch (Exception e)
    82          {
    83              String message = "Error processing navigation template:" +
    84                      template + " using module: " + module;
    85              log.error(message, e);
    86              try
    87              {
    88                  data.getResponse().getWriter().print("Error processing navigation template: "
    89                          + template + " using module: " + module);
    90              }
    91              catch (java.io.IOException ioe)
    92              {
    93                  // ignore
    94              }
    95          }
    96      }
    97  }