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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.NavigationLoader;
    27  import org.apache.turbine.services.template.TurbineTemplate;
    28  import org.apache.turbine.util.RunData;
    29
    30  /**
    31   * Returns output of a Navigation module. An instance of this is placed in the
    32   * request by the JspLayout. This allows template authors to
    33   * set the navigation template they'd like to place in their templates.<br>
    34   * Here's how it's used in a JSP template:<br>
    35   * <code>
    36   * <%useBean id="navigation" class="JspNavigation" scope="request"/%>
    37   * ...
    38   * <%= navigation.setTemplate("admin_navigation.jsp") %>
    39   * </code>
    40   * @author <a href="john.mcnally@clearink.com">John D. McNally</a>
    41   * @author <a href="mbryson@mont.mindspring.com">Dave Bryson</a>
    42   * @author <a href="mailto:hps@intermeta.de">Henning P. Schmiedehausen</a>
    43   * @version $Id: JspNavigation.java 1078552 2011-03-06 19:58:46Z tv $
    44   */
    45  public class JspNavigation
    46  {
    47      /** Logging */
    48      private static Log log = LogFactory.getLog(JspNavigation.class);
    49
    50      /* The RunData object */
    51      private final RunData data;
    52
    53      /**
    54       * Constructor
    55       *
    56       * @param data
    57       */
    58      public JspNavigation(RunData data)
    59      {
    60          this.data = data;
    61      }
    62
    63      /**
    64       * builds the output of the navigation template
    65       * @param template the name of the navigation template
    66       */
    67      public void setTemplate(String template)
    68      {
    69          data.getTemplateInfo().setNavigationTemplate(template);
    70          String module = null;
    71          try
    72          {
    73              module = TurbineTemplate.getNavigationName(template);
    74              NavigationLoader.getInstance().exec(data, module);
    75          }
    76          catch (Exception e)
    77          {
    78              String message = "Error processing navigation template:" +
    79                      template + " using module: " + module;
    80              log.error(message, e);
    81              try
    82              {
    83                  data.getResponse().getWriter().print("Error processing navigation template: "
    84                          + template + " using module: " + module);
    85              }
    86              catch (java.io.IOException ioe)
    87              {
    88                  // ignore
    89              }
    90          }
    91      }
    92  }