/*
    * Created on Sep 23, 2003
    *
    * To change the template for this generated file go to
    * Window>Preferences>Java>Code Generation>Code and Comments
    */
   package joeq.Compiler.Analysis.IPSSA.Utils;
   
   import java.util.Iterator;
  import jwutil.util.Assert;
  
  /***
   * @author livshits
   * @version $Id: IteratorHelper.java 1931 2004-09-22 22:17:47Z joewhaley $
   */
  public class IteratorHelper {
      public static class SingleIterator implements Iterator {
          boolean _done;
          Object  _obj;
          
          public SingleIterator(Object obj){
              _done = false;
              _obj  = obj; 
          }
          public boolean hasNext() {
              return !_done;
          }
  
          public Object next() {
              Assert._assert(!_done);
              return _obj;
          }
  
          public void remove() {
              Assert._assert(false);            
          }    
      }
      
      public static class EmptyIterator implements Iterator {
          private EmptyIterator(){}
          public boolean hasNext() {return false;}
          public Object next() {
              Assert._assert(false);
              return null;
          }
          public void remove() {
              Assert._assert(false);            
          }
          
          public static class FACTORY {
              static EmptyIterator _sample = null;
              
              public static EmptyIterator get(){
                  if(_sample == null){
                      _sample = new EmptyIterator();
                  }
                  
                  return _sample;
              }
          }
      }
  }