UrlController xref

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    1   /*
    2    * $Id: UrlController.java 471754 2006-11-06 14:55:09Z husted $
    3    *
    4    * Licensed to the Apache Software Foundation (ASF) under one
    5    * or more contributor license agreements.  See the NOTICE file
    6    * distributed with this work for additional information
    7    * regarding copyright ownership.  The ASF licenses this file
    8    * to you under the Apache License, Version 2.0 (the
    9    * "License"); you may not use this file except in compliance
    10   * with the License.  You may obtain a copy of the License at
    11   *
    12   *  http://www.apache.org/licenses/LICENSE-2.0
    13   *
    14   * Unless required by applicable law or agreed to in writing,
    15   * software distributed under the License is distributed on an
    16   * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
    17   * KIND, either express or implied.  See the License for the
    18   * specific language governing permissions and limitations
    19   * under the License.
    20   */
    21
    22  package org.apache.struts.tiles;
    23
    24  import java.io.IOException;
    25
    26  import javax.servlet.RequestDispatcher;
    27  import javax.servlet.ServletContext;
    28  import javax.servlet.ServletException;
    29  import javax.servlet.http.HttpServletRequest;
    30  import javax.servlet.http.HttpServletResponse;
    31
    32  /**
    33   * Tiles controller including a local URL.
    34   */
    35  public class UrlController implements Controller {
    36
    37      /**
    38       * URL associated with this controller.
    39       */
    40      protected String url = null;
    41
    42      /**
    43       * Constructor.
    44       * @param url URL.
    45       */
    46      public UrlController(String url) {
    47          this.url = url;
    48      }
    49
    50      /**
    51       * Method associated to a tile and called immediately before the tile
    52       * is included.  This implementation calls an <code>Action</code>.
    53       * No servlet is set by this method.
    54       *
    55       * @param tileContext Current tile context.
    56       * @param request Current request.
    57       * @param response Current response.
    58       * @param servletContext Current servlet context.
    59       */
    60      public void perform(
    61          ComponentContext tileContext,
    62          HttpServletRequest request,
    63          HttpServletResponse response,
    64          ServletContext servletContext)
    65          throws ServletException, IOException {
    66
    67          RequestDispatcher rd = servletContext.getRequestDispatcher(url);
    68          if (rd == null) {
    69              throw new ServletException(
    70                  "Controller can't find url '" + url + "'.");
    71          }
    72
    73          rd.include(request, response);
    74      }
    75
    76      /**
    77       * @see org.apache.struts.tiles.Controller#execute(org.apache.struts.tiles.ComponentContext, javax.servlet.http.HttpServletRequest, javax.servlet.http.HttpServletResponse, javax.servlet.ServletContext)
    78       */
    79      public void execute(
    80          ComponentContext tileContext,
    81          HttpServletRequest request,
    82          HttpServletResponse response,
    83          ServletContext servletContext)
    84          throws Exception {
    85
    86          RequestDispatcher rd = servletContext.getRequestDispatcher(url);
    87          if (rd == null) {
    88              throw new ServletException(
    89                  "Controller can't find url '" + url + "'.");
    90          }
    91
    92          rd.include(request, response);
    93
    94      }
    95
    96  }