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    1   /*
    2    * Licensed to the Apache Software Foundation (ASF) under one
    3    * or more contributor license agreements.  See the NOTICE file
    4    * distributed with this work for additional information
    5    * regarding copyright ownership.  The ASF licenses this file
    6    * to you under the Apache License, Version 2.0 (the
    7    * "License"); you may not use this file except in compliance
    8    * with the License.  You may obtain a copy of the License at
    9    *
    10   *   http://www.apache.org/licenses/LICENSE-2.0
    11   *
    12   * Unless required by applicable law or agreed to in writing,
    13   * software distributed under the License is distributed on an
    14   * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
    15   * KIND, either express or implied.  See the License for the
    16   * specific language governing permissions and limitations
    17   * under the License.
    18   */
    19
    20  package org.apache.myfaces.orchestra.frameworkAdapter.springBasic;
    21
    22  import org.apache.commons.logging.Log;
    23  import org.apache.commons.logging.LogFactory;
    24  import org.apache.myfaces.orchestra.frameworkAdapter.basic.BasicFrameworkAdapter;
    25  import org.apache.myfaces.orchestra.frameworkAdapter.basic.BasicFrameworkAdapterFilter;
    26  import org.apache.myfaces.orchestra.lib._UrlMatcher;
    27
    28  import javax.servlet.Filter;
    29  import javax.servlet.FilterChain;
    30  import javax.servlet.FilterConfig;
    31  import javax.servlet.ServletException;
    32  import javax.servlet.ServletRequest;
    33  import javax.servlet.ServletResponse;
    34  import java.io.IOException;
    35
    36  /**
    37   * Configures the SpringBasicFrameworkAdapter.
    38   * <p>
    39   * Orchestra accesses information about the request, response, session, etc via a
    40   * FrameworkAdapter so that it can be used with multiple web tier frameworks. This
    41   * class selects and configures a version of this adapter which looks up variables
    42   * via Spring.
    43   * <p>
    44   * If filter config parameter "conversationMessagerClass" is set, then this is
    45   * passed to the SpringBasicFrameworkAdapter, meaning that this can be either a
    46   * beanname defined in the dependency-injection framework, or an absolute
    47   * classname of a type implementing ConversationMessager.
    48   * <p>
    49   * This filter access the Spring framework to lookup the bean in its
    50   *  {@link org.apache.myfaces.orchestra.frameworkAdapter.FrameworkAdapter#getBean} method
    51   */
    52  public class SpringBasicFrameworkAdapterFilter implements Filter
    53  {
    54      private final static String INIT_CONVERSATION_MESSAGER = "conversationMessagerClass";
    55
    56      private final Log log = LogFactory.getLog(BasicFrameworkAdapterFilter.class);
    57      private BasicFrameworkAdapter adapter;
    58      private _UrlMatcher urlMatcher;
    59
    60      public void init(FilterConfig filterConfig) throws ServletException
    61      {
    62          String conversationMessager = filterConfig.getInitParameter(INIT_CONVERSATION_MESSAGER);
    63
    64           adapter = new SpringBasicFrameworkAdapter(filterConfig.getServletContext(), conversationMessager);
    65           urlMatcher = new _UrlMatcher(filterConfig);
    66      }
    67
    68      public void doFilter(ServletRequest req, ServletResponse rsp, FilterChain filterChain)
    69      throws IOException, ServletException
    70      {
    71          if (!urlMatcher.accept(req))
    72          {
    73              filterChain.doFilter(req, rsp);
    74              return;
    75          }
    76
    77          log.debug("doFilter");
    78          try
    79          {
    80              adapter.beginRequest(req, rsp);
    81              filterChain.doFilter(req, rsp);
    82          }
    83          finally
    84          {
    85              adapter.endRequest();
    86          }
    87      }
    88
    89      public void destroy()
    90      {
    91      }
    92  }