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1   /*
2    * Licensed to the Apache Software Foundation (ASF) under one or more
3    * contributor license agreements.  See the NOTICE file distributed with
4    * this work for additional information regarding copyright ownership.
5    * The ASF licenses this file to You under the Apache License, Version 2.0
6    * (the "License"); you may not use this file except in compliance with
7    * the License.  You may obtain a copy of the License at
8    * 
9    *      http://www.apache.org/licenses/LICENSE-2.0
10   * 
11   * Unless required by applicable law or agreed to in writing, software
12   * distributed under the License is distributed on an "AS IS" BASIS,
13   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14   * See the License for the specific language governing permissions and
15   * limitations under the License.
16   */
17  package org.apache.jetspeed.aggregator.impl;
18  
19  import java.io.IOException;
20  import java.util.HashMap;
21  
22  import org.apache.jetspeed.PortalReservedParameters;
23  import org.apache.jetspeed.aggregator.PortletAggregator;
24  import org.apache.jetspeed.aggregator.PortletRenderer;
25  import org.apache.jetspeed.exception.JetspeedException;
26  import org.apache.jetspeed.om.page.ContentFragment;
27  import org.apache.jetspeed.om.page.ContentFragmentImpl;
28  import org.apache.jetspeed.om.page.Fragment;
29  import org.apache.jetspeed.request.RequestContext;
30  
31  /***
32   * PortletAggregator builds the content required to render a single portlet.
33   *
34   * @author <a href="mailto:taylor@apache.org">David Sean Taylor</a>
35   * @version $Id: PortletAggregatorImpl.java 543171 2007-05-31 15:55:09Z ate $
36   */
37  public class PortletAggregatorImpl implements PortletAggregator
38  {
39      private PortletRenderer renderer;
40  
41      public PortletAggregatorImpl(PortletRenderer renderer) 
42      {
43          this.renderer = renderer;
44      }
45  
46      /* (non-Javadoc)
47       * @see org.apache.jetspeed.aggregator.Aggregator#build(org.apache.jetspeed.request.RequestContext)
48       */
49      public void build(RequestContext context) throws JetspeedException, IOException
50      {
51          // construct Fragment for rendering use with
52          // appropriate id to match portlet entity
53          String entity = context.getRequestParameter(PortalReservedParameters.PORTLET_ENTITY);
54          if (entity == null)
55          {
56              entity = (String)context.getAttribute(PortalReservedParameters.PORTLET_ENTITY);
57          }
58          if (entity == null)
59          {
60              return;
61          }        
62          Fragment fragment = context.getPage().getFragmentById(entity);
63          if (fragment == null) 
64          {        
65              String name = context.getRequestParameter(PortalReservedParameters.PORTLET);
66              if (name == null)
67              {
68                  name = (String)context.getAttribute(PortalReservedParameters.PORTLET);
69              }
70              if (name == null)
71              {
72                  return;
73              }
74              fragment = new PortletAggregatorFragmentImpl(entity);        
75              fragment.setType(Fragment.PORTLET);
76              fragment.setName(name);
77          }
78          ContentFragment contentFragment = new ContentFragmentImpl(fragment, new HashMap());
79          renderer.renderNow(contentFragment, context);
80          context.getResponse().getWriter().write(contentFragment.getRenderedContent());
81      }
82      
83  }