CompEx9


1   package org.enhydra.barracuda.examples.xmlc;
2   
3   import java.io.*;
4   import java.util.*;
5   import javax.servlet.*;
6   import javax.servlet.http.*;
7   
8   import org.w3c.dom.*;
9   import org.w3c.dom.html.*;
10  import org.enhydra.xml.xmlc.*;
11  
12  import org.enhydra.barracuda.core.comp.*;
13  import org.enhydra.barracuda.core.comp.helper.*;
14  import org.enhydra.barracuda.core.event.*;
15  import org.enhydra.barracuda.plankton.http.*;
16  import org.enhydra.barracuda.core.util.dom.*;
17  import org.enhydra.barracuda.core.view.*;
18  import org.enhydra.barracuda.examples.xmlc.data.*;
19  
20  /**
21   * Make sure a reusable component can handle nested images within an anchor element
22   */
23  public class CompEx9 extends BTemplateGateway {
24  
25      BComponent broot = null;
26  
27      Document page = null;
28      BTemplate templateComp = null;
29      
30      //-------------------- BTemplateGateway ----------------------
31      /**
32       * Return an instance of the template model
33       */
34      public TemplateModel getTemplateModel() {
35          return new LocalTemplateModel();
36      }
37      
38      /**
39       * Return an instance of the template class (must implement Document)
40       */
41      public Class   getTemplateClass() {
42          return CompEx9HTML.class;
43      }
44      
45      public DOMWriter getDOMWriter() {
46          return new DefaultDOMWriter(true);
47      }
48  
49      /**
50       * Handle the default HttpRequest. 
51       */
52      public Document handleDefault (BComponent root, ViewContext vc, HttpServletRequest req, HttpServletResponse resp) throws IOException {
53  
54          if (templateComp==null) {
55              //load the localized DOM template
56              page = DefaultDOMLoader.getGlobalInstance().getDOM(getTemplateClass());
57          }
58  
59              //create a template component and bind it to the views
60              templateComp = new BTemplate(getTemplateModel());
61              templateComp.setView(new DefaultTemplateView(page.getDocumentElement()));
62              root.removeAll();
63              root.addChild(templateComp);
64  
65          //return the page
66          return page;
67      }
68  
69      protected void handleDefault(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
70  
71          long bmillis = 0;
72          long smillis = 0;
73          long emillis = 0;
74          long elapsed1 = 0;
75          long elapsed2 = 0;
76          if (logger.isInfoEnabled()) bmillis = System.currentTimeMillis();
77          if (logger.isInfoEnabled()) logger.info("Handling incoming HTTP request in "+this);
78          
79          ViewContext vc = null;
80          try {
81              //start by figuring out the ViewCapabilities
82              if (logger.isDebugEnabled()) logger.debug("Create the ViewContext");
83  //csc_101701.1            vc = new DefaultViewContext(new ViewCapabilities(req, resp));
84              vc = new DefaultViewContext(new ViewCapabilities(req, resp), req, resp);    //csc_101701.1
85          
86              //create our root component
87              if (logger.isDebugEnabled()) logger.debug("Create component root");
88              if (broot==null) {
89  //            if (true) {
90                  broot = new BComponent();
91                  broot.setName("Root");
92              }
93              
94              //give the implementation a chance to add any components to the root
95              if (logger.isDebugEnabled()) logger.debug("Handling default");
96              Document doc = handleDefault(broot, vc, req, resp);
97              
98              //now init the component
99              if (logger.isDebugEnabled()) logger.debug("Invoking initCycle on component hierarchy");
100 //            broot.initCycle();
101 broot.validate();
102             
103             //now render the component
104             if (logger.isDebugEnabled()) logger.debug("Rendering component hierarchy");
105             if (logger.isDebugEnabled()) smillis = System.currentTimeMillis();
106             broot.render(vc);
107             if (logger.isDebugEnabled()) elapsed1 = System.currentTimeMillis()-smillis;
108 
109             //its possible the implementor may want to recycle children...if so, remove them
110             //prior to calling destroy on the root
111             if (recycleChildren) {
112                 if (logger.isDebugEnabled()) logger.debug("Recycling child components");
113                 List children = broot.getChildren();
114                 if (children!=null) {
115                     for (int i=children.size()-1; i>=0; i--) {
116                         broot.removeChild(i);            
117                     }
118                 }
119             }
120 
121             //now destroy the component
122             if (logger.isDebugEnabled()) logger.debug("Invoking destroyCycle on component hierarchy");
123 //            broot.destroyCycle();
124 
125             //csc_102201.1            
126             //now adjust the outgoing page (this is critical to make sure we
127             //can accurately detect client scripting)
128 //            ScriptDetector.prepareClientResp(doc, vc);
129 
130             //now render the page
131             if (logger.isDebugEnabled()) logger.debug("Rendering the DOM");
132             if (logger.isInfoEnabled()) smillis = System.currentTimeMillis();
133             this.getDOMWriter().write(doc, resp);
134             if (logger.isInfoEnabled()) {
135                 elapsed2 = System.currentTimeMillis()-smillis;
136                 emillis = System.currentTimeMillis();
137             }
138 
139             if (logger.isInfoEnabled()) logger.info("Dispatching complete! (rendered in "+(elapsed1)+"/written in "+(elapsed2)+" of "+(emillis-bmillis)+" millis)");
140 
141 /*
142         } catch (ClientSideRedirectException re) {
143             //if we get a redirect exception, request the browser to redirect accordingly
144 //            if (logger.isInfoEnabled()) logger.info("ClientSideRedirectException...redirecting to "+re.getRedirectURL());
145 //            resp.setStatus(HttpServletResponse.SC_MOVED_TEMPORARILY);
146 //            resp.setHeader("Location", re.getRedirectURL());
147 
148             String url = URLRewriter.encodeRedirectURL(req, resp, re.getRedirectURL());
149             if (logger.isInfoEnabled()) logger.info("ClientSideRedirectException...redirecting to "+url);
150             resp.sendRedirect(url);    
151 */
152         } catch (RenderException e) {
153             //if we get a RenderException, handle it
154             if (logger.isInfoEnabled()) logger.info("Handling RenderException:"+e);
155             handleRenderException(e, vc, req, resp);
156 /*            
157         } catch (EventException e) {
158             //if we get an EventException, handle it
159             if (logger.isInfoEnabled()) logger.info("Handling EventException:"+e);
160             handleEventException(e, vc, req, resp);
161 */            
162         } finally {
163             //nop
164         }
165     }
166 
167 
168 
169 
170     //--------------- TemplateModel --------------------------
171     /**
172      * LocalTemplateModel
173      */
174     class LocalTemplateModel extends AbstractTemplateModel {
175     
176         //register the model by name
177         public String   getName() {return "Ex9";}
178         
179         //provide items by key
180         public Object   getItem(String   key) {
181             ViewContext vc = getViewContext();
182             ViewCapabilities vcap = vc.getViewCapabilities();
183             if (key.equals("Link1")) {
184                 return new BLink("Click me", "CompTest9");
185             } else {
186                 return super.getItem(key);
187             }
188         }
189     }
190 }
191
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