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Demo

Controller.java

package edu.virtualschool.jwaa.xml;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.Iterator;

import org.apache.log4j.Logger;
import org.apache.velocity.VelocityContext;

import edu.virtualschool.VirtualSchoolNavigationBar;
import edu.virtualschool.jwaa.AccountAbstraction;
import edu.virtualschool.jwaa.Fault;
import edu.virtualschool.jwaa.GenericPage;
import edu.virtualschool.jwaa.IgnorableFault;
import edu.virtualschool.jwaa.bean.DemoAccountBean;
import edu.virtualschool.jwaa.dbms.DB;

public class Controller extends GenericPage
{
  DB dbms;
  PageElement page;
  HashMap dictionary;
  final HashMap param = new HashMap();
  final VelocityContext context = new VelocityContext();
  
  final static Logger logger = Logger.getLogger(Controller.class.getName());
  public final static edu.virtualschool.jwaa.MetaPage meta = new edu.virtualschool.jwaa.MetaPage(
      Controller.class,
      "/jwaa/xml",
      "Controller",
      "Jwaa XML Page Controller"
    );

  public Controller() 
  {
  }
  public final void run() throws Fault
  {
    String path = httpRequest.getPathInfo();
    
    JwaaServlet servlet = (JwaaServlet)this.servlet;
    RootDirectory root = servlet.getRoot();
    this.page = root.findPath(path);
    if (page == null)
      throw new Fault(path+" is not a valid application");
      
    ApplicationElement app = page.getApplication();
    AccountAbstraction account = getAccount();
    if (!page.allowsAccessBy(account))
      page = app.getRefusePage();
      
    try
    {
      this.dbms = app.getDBMS();
      this.dictionary = app.getDictionary();

      GenericForm form = page.getFormInstance(this);
      this.context.put("self", this);
      this.context.put("account", account);
      this.context.put("dbms", dbms);
      this.context.put("form", form);
      
      VelocityEngine engine = app.getVelocityEngine();
      String pageText = page.getText();
      String evalText = engine.evaluate(pageText, this.context);
      send(evalText);
      dbms.commit();
    }
    catch (Fault e)
    {
      logger.error(e, e);
      if (dbms != null)
        dbms.rollback();
      throw e;
    }
    finally
    {
      if (dbms != null)
        dbms.close();
    }
  }
  public final void fault(String text, Throwable e)
  {
    logger.error(e, e);
    try
    {
      if (page != null)
      { 
        PageElement faultPage = page.getApplication().getFaultPage();
        context.put("message", text);
        context.put("fault", e);
        VelocityEngine engine = page.getApplication().getVelocityEngine();
        String pageText = "#header()\n"+faultPage.text+"\n#footer()";
        String evalText = engine.evaluate(pageText, context);
        send(evalText);
      }
      else
        send("<h1 align=\"center\">Whups!</h1><p>"+e.getMessage()+"</p>\n");
    }
    catch (Throwable e1)
    {
      logger.error(e1, e1);
    }
  }
  public final void gotoPage(String pageID)
  {
    PageElement page = findPage(pageID);
    if (page == null)
    {
      logger.error("page "+pageID+" not found");
      return;
    }
    try
    {
      if (page == null)
        logger.error("gotoPage(null) ignored");
      else
        redirect(page);
    }
    catch (IgnorableFault e)  {}
    catch (Throwable e)
    {
      logger.error(e, e);
    }
  }
  public final PageElement findPage(String id)
  {
    return getApplication().findPage(id);
  }
  public final ApplicationElement getApplication()
  {
    return page.getApplication();
  }
  public final PageElement getPage()
  {
    return page;
  }
  public final DB getDB()
  {
    return dbms;
  }
  static final VirtualSchoolNavigationBar topRow = new VirtualSchoolNavigationBar("JWAA");
  public String getNavigationBar()
  {
    int row=1;
    AccountAbstraction account = getAccount();
    StringBuffer buf = new StringBuffer();
    ArrayList pathToRoot = page.getRootPath();
    pathToRoot.add(topRow);
    for (int i = pathToRoot.size()-1; i >= 0; i--)
    {
      Object object = pathToRoot.get(i);
      edu.virtualschool.jwaa.MetaPage parent = (edu.virtualschool.jwaa.MetaPage)object;
      StringBuffer rowBuf = new StringBuffer();
      for (Iterator it = parent.childrenIterator(); it.hasNext(); )
      {
        edu.virtualschool.jwaa.MetaPage child = (edu.virtualschool.jwaa.MetaPage)it.next();
        if (child == null)
          continue;
        String anchor = child.getAnchor();
        if (anchor == null || anchor.equals(""))
          continue;
        else if (child.allowsAccessBy(account)) 
        {
          rowBuf.append((child.isSelected() || pathToRoot.contains(child)) ?  " <td class=\"highlight\">" : " <td>");
          rowBuf.append(emitLink(child));
          rowBuf.append("</td>\n"); 
        }
      }
      if (!rowBuf.toString().equals("")) 
        buf.append(
          "<table class=\"row"+row+"\" width=\"100%\">\n"+
          " <tr>\n"+rowBuf+"\n </tr>\n"+
          "</table>\n");
      row++;
    }
    return buf.toString();
  }
  public final PageElement getNextPage()
  {
    ArrayList siblings = page.pages.getPages();
    int index = siblings.indexOf(page);
    if (index < siblings.size() - 1)
      return (PageElement) siblings.get(index + 1);
    else
      return page.getApplication().getInnerHomePage();
  }
  public final PageElement getPrevPage()
  {
    ArrayList siblings = page.pages.getPages();
    int index = siblings.indexOf(page);
    if (index >= 1)
      return (PageElement) siblings.get(index - 1);
    else
      return page.getApplication().getInnerHomePage();
  }
  public String link(String key)
  {
    String uri = (String)dictionary.get(key);
    if (uri != null)
      return (String)httpResponse.encodeURL(uri);
    logger.error(key + " not found in application dictionary");
    return "<b>("+key+" not found in dictionary)</b>";
  }
  public final void logout()
  {
    super.setAccount(DemoAccountBean.Null);
  }
}
/*
  public final String emitXML(String filePath)
    throws Fault
  {
    logger.debug("emitXML "+filePath);
    JwaaServlet servlet = (JwaaServlet)this.servlet;
    RootDirectory root = servlet.root;
    File file = new File(root.fileMonitor.file, filePath);
    FileField field = new FileField(file);
    Reader reader = field.getReader();
    return XMLUtil.escape(reader);
  }
  public String encodeURL(String uri)
  {
    String encodedURL = httpResponse.encodeURL(uri);
    return encodedURL;
  }
  public final String emitLink(String p)
  {
    return emitLink(p, null, null, null);
  }
  public final String emitLink(String p, Object anchor)
  {
    return emitLink(p, anchor, null, null);
  }
  public final String emitLink(String p, Object anchor, Object title)
  {
    return emitLink(p, anchor, title, null);
  }
  public final String emitLink(String p, Object anchor, ArrayList args)
  {
    return emitLink(p, anchor, null, args);
  }
  private final static Object[] nullArgs = new Object[] {};
  public final String emitLink(String p, Object anchor, Object title, ArrayList args)
  {
    if (p == null)
      return "emitLink(null, ...) ignored";
    PageElement page = findPage(p);
    if (page == null)
      return "page "+p+" not found";
    ApplicationElement application = page.pages.getApplication();
    Object[] argArray = nullArgs;
    if (args != null)
      argArray = args.toArray();
    return page.emitLink(this, anchor, title, argArray);
  }
  public final String emitForm()
  {
    return page.emitForm(this, null);
  }
*/