PublisherXmlRequestBuilder


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.outerx.daisy.x10Publisher.PublisherRequestDocument;
19  import org.apache.xmlbeans.XmlSaxHandler;
20  import org.apache.xmlbeans.XmlObject;
21  import org.apache.xmlbeans.XmlException;
22  import org.apache.cocoon.components.flow.util.PipelineUtil;
23  import org.apache.cocoon.components.LifecycleHelper;
24  import org.apache.avalon.framework.context.Context;
25  import org.apache.avalon.framework.service.ServiceManager;
26  import org.xml.sax.SAXException  ;
27  import org.xml.sax.ContentHandler  ;
28  
29  /**
30   * Utility code to build a PublisherRequestDocument from the output of a Cocoon pipeline.
31   */
32  public class PublisherXmlRequestBuilder {
33      public static PublisherRequestDocument loadPublisherRequest(String   name, Object   params, ServiceManager serviceManager, Context context) throws Exception   {
34          XmlSaxHandler xmlSaxHandler = XmlObject.Factory.newXmlSaxHandler();
35          try {
36              executePipeline(name, params, xmlSaxHandler.getContentHandler(), serviceManager, context);
37          } catch (Throwable   e) {
38              throw new Exception  ("Error building publisher request for \"" + name + "\".", e);
39          }
40  
41          XmlObject requestAsXmlObject = null;
42          try {
43              requestAsXmlObject = xmlSaxHandler.getObject();
44          } catch (XmlException e) {
45              throw new SAXException  ("Error retrieving publisher request as XmlObject.", e);
46          }
47  
48          PublisherRequestDocument publisherRequestDocument = (PublisherRequestDocument)requestAsXmlObject.changeType(PublisherRequestDocument.type);
49          if (publisherRequestDocument == null)
50              throw new SAXException  ("Could not change the type of the XmlObject to PublisherRequestDocument.");
51  
52          return publisherRequestDocument;
53      }
54  
55      private static void executePipeline(String   pipe, Object   viewData, ContentHandler   contentHandler, ServiceManager serviceManager, Context context) throws Exception   {
56          PipelineUtil pipelineUtil = new PipelineUtil();
57          try {
58              LifecycleHelper.setupComponent(pipelineUtil, null, context, serviceManager, null, false);
59              pipelineUtil.processToSAX(pipe, viewData, contentHandler);
60          } finally {
61              LifecycleHelper.dispose(pipelineUtil);
62          }
63      }
64  }
65
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