package bluej.debugmgr;

import threadchecker.OnThread;
import threadchecker.Tag;




| This class implements a singleton history object for library class
| invocations.
|
| @author Michael Kolling
| @version $Id: ClassHistory.java 16001 2016-06-09 15:35:27Z nccb $
|
@OnThread(Tag.Any)
public class ClassHistory
extends History{
   

   
   private static ClassHistory classHistory = null;

   
   


| Get the class history singleton. The first time this method
| is called, the 'maxLength' parameter determines the history
| size. The parameter has no effect on subsequent calls.
|
public static ClassHistory getClassHistory(int maxLength)
   {
      if (classHistory == null)
           
      classHistory = new ClassHistory(maxLength);
       
      return classHistory;     
      }

   
   

   
   

| Initialise this history with some often-used classes for convinience.
|
private ClassHistory(int maxLength)
   {
      super(maxLength, false);
      put("java.lang.String");
      put("java.lang.Math");
      put("java.util.ArrayList");
      put("java.util.Random");
      put("java.util.");
      put("java.awt.");
      put("javax.swing.");     
      } 
   }