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1   /* 
2    * Copyright 2004 University of Hannover
3    * 
4    * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except
5    * in compliance with the License. You may obtain a copy of the License at
6    * 
7    * http://www.apache.org/licenses/LICENSE-2.0
8    * 
9    * Unless required by applicable law or agreed to in writing, software distributed under the License
10   * is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
11   * or implied. See the License for the specific language governing permissions and limitations under
12   * the License.
13   */
14  
15  package olr.presentation;
16  
17  import java.util.List;
18  
19  import olr.rdf.Attribute;
20  import olr.rdf.OLR3Definitions;
21  import olr.rdf.Resource;
22  import olr.rdf.Tools;
23  import olr.viewer.CourseViewer;
24  import olr.viewer.ModelViewerRow;
25  
26  import org.apache.log4j.Logger;
27  import org.w3c.dom.html.HTMLTableElement;
28  import org.w3c.dom.html.HTMLTableRowElement;
29  
30  import com.lutris.appserver.server.httpPresentation.HttpPresentationException;
31  import com.lutris.appserver.server.httpPresentation.HttpPresentationRequest;
32  
33  /*** 
34   * @version $Id: ImageStructure.java,v 1.8 2004/08/03 09:47:36 roku Exp $
35   */
36  public class ImageStructure extends SecureHttpPresentation {
37      /*** 
38       * Initializes an instance of this class.
39       */
40      public ImageStructure() {
41      }
42  
43      public String handleDefault() throws HttpPresentationException {
44          return showPage();
45      }
46  
47      public String handleExpand() throws HttpPresentationException {
48          HttpPresentationRequest request = getComms().request;
49          try {
50              CourseViewer courseViewer = getSessionData().getCourseViewers().getActiveViewer();
51              int rowNr = Integer.parseInt(request.getParameter("row"));
52              courseViewer.expandResource(rowNr);
53          } catch (Exception e) {
54              e.printStackTrace();
55          }
56          return showPage();
57      }
58  
59      public String showPage() {
60          final ImageStructureHTML page = new ImageStructureHTML();
61          try {
62              final HTMLTableElement table = page.getElementGenerate();
63              final HTMLTableRowElement root = page.getElementRoot();
64              final HTMLTableRowElement imageInstance = page.getElementImageInstance();
65              final HTMLTableRowElement other = page.getElementOther();
66              final CourseViewer courseViewer = getSessionData().getCourseViewers().getActiveViewer();
67              if (courseViewer != null) {
68                  final List rows = courseViewer.getModelRows();
69  
70                  for (int rowNr = 0; rowNr < rows.size(); rowNr++) {
71  
72                      final ModelViewerRow row = (ModelViewerRow) rows.get(rowNr);
73                      courseViewer.checkSub(rowNr);
74  
75                      if (row.isPredicate())
76                          continue;
77                      final Resource resource = getSessionData().getStatementPool().getResource(
78                              row.getResource());
79                      if (resource == null)
80                          continue;
81                      final String type = resource.getType();
82                      final String title = resource.getTitle();
83                      final String indent = "".concat(String.valueOf(String.valueOf(row.getIndent() * 4)));
84                      final String hrefExpand = String.valueOf(String.valueOf((new StringBuffer(
85                              "ImageStructure.po?event=expand&row=")).append(rowNr)));
86                      final String hrefShow = String.valueOf(String.valueOf((new StringBuffer(
87                              "Content.po?aboutURI=")).append(Tools.URItoID(resource.getURI()))));
88                      if (row.getIndent() == 0) {
89                          page.getElementSpace0().setWidth(indent);
90                          page.getElementShow0().setHref(hrefShow);
91                          page.setTextShow0(title);
92                          table.appendChild(root.cloneNode(true));
93                          continue;
94                      }
95                      final List engineImages = getSessionData().getStatementPool()
96                              .getSpecificAttributesAbout(type, OLR3Definitions.OLR3_ENGINEIMAGE);
97                      if (engineImages.size() > 0) {
98                          page.getElementSpace1().setWidth(indent);
99                          page.getElementImage()
100                                 .setSrc(((Attribute) engineImages.get(0)).getObject());
101                         page.getElementExpand1().setHref(hrefExpand);
102                         page.getElementShow1().setHref(hrefShow);
103                         page.setTextShow1(title);
104                         table.appendChild(imageInstance.cloneNode(true));
105                     } else {
106                         page.getElementSpace2().setWidth(indent);
107                         page.getElementExpand2().setHref(hrefExpand);
108                         page.getElementShow2().setHref(hrefShow);
109                         page.setTextExpand2(row.isExpandable() ? row.isExpanded() ? "-" : "+" : "");//ge�ndert
110                         page.setTextShow2(title);
111                         table.appendChild(other.cloneNode(true));
112                     }
113                 }
114             }
115             table.removeChild(root);
116             table.removeChild(imageInstance);
117             table.removeChild(other);
118         } catch (Exception e) {
119             Logger.getLogger(getClass()).error(e);
120         }
121         return page.toDocument();
122     }
123 
124     private final String THIS_HTML = "ImageStructure.po";
125 
126     private final String CONTENT_HTML = "Content.po";
127 }