package org.paneris.bibliomania;
   
   import java.util.Enumeration;
   import java.util.Vector;
   
   import org.melati.Melati;
   import org.webmacro.servlet.WebContext;
   
   public class AllMessageboards extends BibliomaniaServlet {
  
    /**
     * 
     */
    private static final long serialVersionUID = 1L;
  
    protected String bibliomaniaHandle(Melati melati, WebContext context)
              throws Exception {
          
      BibliomaniaDatabase db = (BibliomaniaDatabase) melati.getDatabase();
      db.setupContext(melati, context, null, null);
      
      Vector sectionGroups = load(db.getSectionGroupTable().selection());
      Vector sections = load(db.getSectionTable().selection());
      Vector authors = load(db.getAuthorTable().selection());
      Vector books =  load(db.getBookTable().selection());
      
      authors = ensure(authors, books);
      sections = ensure(sections, authors);
      sectionGroups = ensure(sectionGroups, sections);
      
      context.put("sectionGroups",sectionGroups);    
      context.put("sections",sections);    
      context.put("authors",authors);    
      context.put("books",books);    
      
      return "AllMessageboards.wm";
    }
    
    private Vector ensure(Vector a, Vector b) {
      for (Enumeration e = b.elements(); e.hasMoreElements();) {
        Unit u = (Unit)e.nextElement();
        if (!a.contains(u.getParentUnit())) { 
          a.add(u.getParentUnit());
        }
      }
      return a;
    }
  
    private Vector load(Enumeration e) {
      Vector v = new Vector();
      while (e.hasMoreElements()) {
        Unit u = (Unit)e.nextElement();
        if (u.getMessageboard() != null && u.getMessageboard().isActive()) {
          v.add(u);
        }
      }
      return v;
    }  
  }