HelloWorld2a


1   package org.enhydra.barracuda.tutorials.comp;
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.enhydra.xml.xmlc.*;
10  
11  import org.enhydra.barracuda.core.comp.*;
12  import org.enhydra.barracuda.core.comp.helper.*;
13  import org.enhydra.barracuda.core.util.dom.*;
14  import org.enhydra.barracuda.tutorials.xmlc.*;
15  
16  /**
17   * Here's an example of HelloWorld using the BList
18   * component
19   */
20  public class HelloWorld2a extends ComponentGateway {
21  
22      //xmlc factory (ok as static because its threadsafe)
23  //     private static XMLCFactory xmlcFactory = null;
24  
25      //-------------------- ComponentGateway ----------------------
26      /**
27       * Handle the default HttpRequest. 
28       */
29      public Document handleDefault (BComponent root, ViewContext vc, HttpServletRequest req, HttpServletResponse resp) throws IOException {
30          //load the DOM object
31  //        if (xmlcFactory==null) xmlcFactory = new XMLCStdFactory(this.getClass().getClassLoader(), new StreamXMLCLogger());
32  //        HelloWorld2aHTML page = (HelloWorld2aHTML) xmlcFactory.create(HelloWorld2aHTML.class);
33  
34          //load the localized DOM template
35          HelloWorld2aHTML page = (HelloWorld2aHTML)DefaultDOMLoader.getGlobalInstance().getDOM(HelloWorld2aHTML.class, vc.getViewCapabilities().getClientLocale());
36          
37          //start by setting basic data (here we just leverage existing 
38          //XMLC technology)
39          page.setTextTitle1("Hello World 2a example");
40          page.setTextTitle2("Hello World 2a example");
41          page.setTextDescr("This example illustrates how we can create populate a page using other Barracuda components--like BList--without putting anything in the HTML template except for standard XMLC style id values.");
42  
43          //ok, now we need to setup the list component and add 
44          //it to the root
45          String  [] items = new String  [] {"Cabbage", "Carrots", "Pickles", "Sugar", "Wheaties", "Flour", "Potatoes"};
46          String  [] qtys =  new String  [] {"3 heads", "1 bag", "1 jar", "5 lbs", "3 bxs", "50 lbs", "25 lbs"};
47          ListModel listModel = new GroceriesModel(items, qtys);
48          View listView = new DefaultView(page.getElementShoppingList());
49          BList wcList = new BList(listModel);
50          wcList.setView(listView);
51          root.addChild(wcList);
52          
53          //set up the footer component (notice we use a list component)
54          DefaultListModel flistModel = new DefaultListModel();
55          View flistView = new DefaultView(page.getElementFooter());
56          BList fwcList = new BList(flistModel);
57          fwcList.setView(flistView);
58          root.addChild(fwcList);
59  
60          //now to add data to the footer list we're actually going to 
61          //add in all the child nodes
62          Node fn = HelloWorld2Footer.getNode(page.getDocument());
63          NodeList nl = fn.getChildNodes();
64          for (int i=0,max=nl.getLength(); i<max; i++) {
65              flistModel.add(nl.item(i));
66          }
67          
68          //return the page
69          return page;
70      }
71  
72      //--------------- GroceriesModel -------------------------
73      /**
74       * Groceries Model
75       */
76      class GroceriesModel extends AbstractListModel {
77  
78          String  [] items = null;
79          String  [] qtys = null;
80  
81          //constructor
82          public GroceriesModel(String  [] iitems, String  [] iqtys) {
83              items = iitems;
84              qtys = iqtys;
85          }
86  
87          //provide items by pos
88          public Object   getItemAt(int index) {
89              return qtys[index]+" "+items[index];
90          }
91  
92          //get the size of the list
93          public int getSize() {
94              return items.length;
95          }
96      }
97  
98  }
99
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