SetVersionHeaderAction


1   /*
2    * Copyright 2004 Outerthought bvba and Schaubroeck nv
3    *
4    * Licensed under the Apache License, Version 2.0 (the "License");
5    * you may not use this file except in compliance with the License.
6    * You may obtain a copy of the License at
7    *
8    *     http://www.apache.org/licenses/LICENSE-2.0
9    *
10   * Unless required by applicable law or agreed to in writing, software
11   * distributed under the License is distributed on an "AS IS" BASIS,
12   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13   * See the License for the specific language governing permissions and
14   * limitations under the License.
15   */
16  package org.outerj.daisy.frontend;
17  
18  import org.apache.cocoon.acting.Action;
19  import org.apache.cocoon.environment.*;
20  import org.apache.avalon.framework.thread.ThreadSafe;
21  import org.apache.avalon.framework.parameters.Parameters;
22  import org.apache.avalon.framework.activity.Initializable;
23  import org.outerj.daisy.util.VersionHelper;
24  
25  import java.util.Map  ;
26  
27  /**
28   * Sets a HTTP header containing the Daisy Version.
29   * This action should typically be put somewhere at the start of the sitemap.
30   */
31  public class SetVersionHeaderAction implements Action, ThreadSafe, Initializable {
32      private static String   versionString;
33  
34      public void initialize() throws Exception   {
35          versionString = VersionHelper.getVersionString(SetVersionHeaderAction.class.getClassLoader(),
36                  "org/outerj/daisy/frontend/versioninfo.properties");
37      }
38  
39      public Map   act(Redirector redirector, SourceResolver resolver, Map   objectModel, String   source, Parameters parameters) throws Exception   {
40          Response response = ObjectModelHelper.getResponse(objectModel);
41          response.setHeader("X-Daisy-Version", versionString);
42          return null;
43      }
44  }
45
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