/* Copyright 2000 Charles G. Wright
 * This software may be distributed under the terms of the
 * GNU General Public License.
 *
 * $Id: CWmonitoredElements.java,v 1.1 2000-06-15 10:14:52-05 chuckles Exp chuckles $
 */


import java.util.*;
import java.awt.*;

/** <p>The purpose of this class is to maintain a list of all
 * information that can be displayed as output. The information
 * can be retrieved from a variety of classes. If a class can
 * supply information for monitoring, it must implement the
 * CWmonitorable interface, meaning that it implements
 * <ul><li>String name; // A name
 * <li>String[] fields; // An array of names of elements.
 * <li>double getValue(TMYdata tmystuff, int month, int day, int hour, int fieldnum)
 * </ul>
 * <p>The class also manages a set of List objects that are used to
 * select monitored information. As monitored elements are added,
 * a string representing that object is added to each registered List.
 */

public class CWmonitoredElements {
  private static Vector elements = new Vector();

  // List objects that must be kept in sync with this list.
  // As elements are added to the elements list, we need to
  // add corresponding entries to the List objects.

  // Right now, the List(s) must be created first.

  public static Vector lists = new Vector();
  //---------------------------------------------------
  /** Register all of the monitorable elements for a given class.*/

  public static void addElements(CWmonitorable obj){
    for (int i = 0; i < obj.getFields().length; i++){
      addElement(obj, i);
    }
  }
  //----------------------------------------------------
  /** Add a monitorable element to the list.*/

  public static void addElement(CWmonitorable obj, int fi){
    java.awt.List li;
    // Create a monitorable element and add to the vector.
    CWmonitoredElement me = new CWmonitoredElement(obj, fi);
    elements.addElement(me);

    // create a string of the form <object_name>.<field_name>...

    String list_entry = obj.getName() + ": " + obj.getFields()[fi];
    System.out.println("List entry: " + list_entry);

    // Add this string to each of the Lists.
    
    for (int i = 0; i < lists.size(); i++){
      li = (java.awt.List)lists.elementAt(i);
      li.add(list_entry);
    } 
    System.out.println("List entry added."); 
  }

  //--------------------------------------------------
  // Add a List that is to be kept current.
  public static void addList(java.awt.List li){
    lists.addElement(li);
  }
  //------------------------------------------------
  public static int size(){
    return(elements.size());
  }
  //-------------------------------------------------
  public static CWmonitorable objectAt(int i){
    CWmonitoredElement me = (CWmonitoredElement)elements.elementAt(i);
    return (CWmonitorable)me.obj;
  }
  //----------------------------------------------
  public static int indexAt(int i){
    CWmonitoredElement me = (CWmonitoredElement)elements.elementAt(i);
    return me.index;
  }
}