Examples of the descriptor being used in client code.

• By William Louth
• November 17, 2000

// TreeCellRenderer
  Descriptor d = DescriptorLookup.getInstance().get(value);
  setIcon(IconManager.getInstance().getIcon(d.getIcon(value)));
  setText(d.getName(value));


// ListCellRenderer - getListCellRendererComponent method
  if ((value instanceof Describeable)) {
    // get the descriptor, ask it to determine the icon and text for the
    //  list item to be displayed
    Descriptor dd = DescriptorLookup.getInstance().get(value);
    setIcon(IconManager.getInstance().getIcon(dd.getIcon(value)));
    setText(dd.getName(value));
  }
// FolderTableModel methods
public String getColumnName(int col) {
 // _props is a list of PropertyDescriptors that is set when the folder
 // table model is given a Folder object to display. Folder objects hold
 // only one type of Describeable object. The table model can get the
 // object descriptor relating to the type of contents and determine
 // the columns and so on.
 return ((PropertyDescriptor)_props.get(col)).getName();
}
public int getColumnCount() {
 return _props.size();
}
// The following 2 methods can handle any list of objects, i.e.,
// rows, without writing type-specific code.


public Object getValueAt(int row, int col) {
 Object value = null;
  try {
   if(_rows[row]==null)
     _rows[row] = getValues((Describeable)_objs[row]);
     value = ((Object[])_rows[row])[col];
  } catch (Exception e) {
    value = e;
  }
  return value;
}
private Object[] getValues(Describeable d) {
 int size = _props.size();
 Object[] props = new Object[size];
 for(int i = 0; i < size; i++)
   props[i]  = ((PropertyDescriptor)_props.get(i)).getValue(d);
 return props;
}