import javax.swing.DefaultListModel;

/**
 * DoubleListModel is the model for the DoubleList class.
 * It overrides a couple of methods so that only Doubles are
 * placed into it.
 * 
 * @author Stuart Hansen
 * @version September 2008
 */

public class DoubleListModel extends DefaultListModel
{
      // Overrides add element so that only Doubles are added
      public void addElement(Object obj)
      {
         Double d = Double.parseDouble(obj.toString());
         addElement(d);
      }
      
      // A specialized addElement for Doubles
      public void addElement(Double d)
      {
    	  super.addElement(d);
      }
      
      // Overrides toArray() so that the returned Array contains Doubles
      public Double[] toArray()
      {
         Object[] tempArr = super.toArray();
         Double[] dArr = new Double[tempArr.length];
         for (int i=0; i<tempArr.length; i++)
            dArr[i] = (Double) tempArr[i];
         return dArr;
      }
}