// $Id: AbstractTreeSelectionGuard.java 165 2009-05-28 21:46:38Z agony $
   /**
    * 
    */
   package de.mindcrimeilab.xsanalyzer.model;
   
   import java.beans.PropertyChangeEvent;
   import java.beans.PropertyChangeListener;
   
  import javax.swing.tree.TreePath;
  
  import org.springframework.binding.value.ValueModel;
  import org.springframework.richclient.core.Guarded;
  
  /**
   * @author Michael Engelhardt<me@mindcrime-ilab.de>
   * @author $Author: agony $
   * @version $Revision: 165 $
   * 
   */
  public abstract class AbstractTreeSelectionGuard implements PropertyChangeListener {
  
      private final ValueModel selectionHolder;
  
      private final Guarded guarded;
  
      public AbstractTreeSelectionGuard(ValueModel selectionHolder, Guarded guarded) {
          this.selectionHolder = selectionHolder;
          this.selectionHolder.addValueChangeListener(this);
          this.guarded = guarded;
          propertyChange(null);
      }
  
      /*
       * (non-Javadoc)
       * 
       * @see java.beans.PropertyChangeListener#propertyChange(java.beans.PropertyChangeEvent)
       */
      @Override
      public void propertyChange(PropertyChangeEvent evt) {
          TreePath[] selected = (TreePath[]) selectionHolder.getValue();
          guarded.setEnabled(shouldEnable(selected));
  
      }
  
      public Guarded getGuarded() {
          return guarded;
      }
  
      public ValueModel getSelectionHolder() {
          return selectionHolder;
      }
  
      protected abstract boolean shouldEnable(TreePath[] selected);
  }