package com.melloware.jukes.gui.view.node;
   
   import java.util.Iterator;
   
   import javax.swing.Icon;
   
   import org.apache.commons.logging.Log;
   import org.apache.commons.logging.LogFactory;
   
  import com.melloware.jukes.db.orm.Artist;
  import com.melloware.jukes.db.orm.Catalog;
  
  /**
   * Describes the root node in the Jukes navigation tree.
   * <p>
   * Copyright (c) 1999-2007 Melloware, Inc. <http://www.melloware.com>
   * @author Emil A. Lefkof III <info@melloware.com>
   * @version 4.0
   */
  public final class RootNode
      extends AbstractTreeNode {
  
      private static final Log LOG = LogFactory.getLog(RootNode.class);
  
      private final Catalog catalog;
  
      /**
       * Creates a root node for the specified catalog.
       *
       * @param aCatalog    the associated catalog
       */
      public RootNode(Catalog aCatalog) {
          super(null, aCatalog);
          LOG.debug("Created RootNode");
          this.catalog = aCatalog;
      }
  
      /**
       * Returns this node's associated Catalog instance.
       *
       * @return this node's associated Description instance.
       * @see NavigationNode#getModel()
       */
      public Catalog getCatalog() {
          return (Catalog)getModel();
      }
  
      /**
       * Returns this node's icon. Since the root node will be hidden
       * by the tree, we can return <code>null</code>.
       *
       * @return null
       */
      public Icon getIcon(boolean sel) {
          return null;
      }
  
      /**
       * Returns this node's name. Since the root node will be hidden
       * by the tree, we can return <code>null</code>.
       *
       * @return null
       */
      public String getName() {
          return null;
      }
  
  
      /**
       * Loads all the artists in the collection sorted by name ascending.
       */
      public void loadChildren() {
      	if (!childrenLoaded) {
              loadingChildren = true;
              LOG.debug("Loading artists");
              Iterator iter = catalog.getArtists().iterator();
              while (iter.hasNext()) {
                  Artist artist = (Artist)iter.next();
                  if (LOG.isDebugEnabled()) {
                  	LOG.debug("Loading artist: "+artist.getName());
  				}
                  ArtistNode node = new ArtistNode(this, artist);
                  this.add(node);
              }
              loadingChildren = false;
              childrenLoaded = true;
          }
      }
  
  }