iteratorfiltersupport.java

来自「webwork source」· Java 代码 · 共 53 行

/*
 * WebWork, Web Application Framework
 *
 * Distributable under Apache license.
 * See terms of license at opensource.org
 */
package webwork.util;

import java.util.Enumeration;
import java.util.Iterator;

/**
 *	A base class for iterator filters
 *
 *	@author Rickard 謆erg ([e-mail])
 *	@version $Revision: 1.9 $
 */
public abstract class IteratorFilterSupport
{
   // Protected implementation --------------------------------------
   protected Object getIterator(Object source)
   {
      return MakeIterator.convert(source);
   }

   // Wrapper for enumerations
   public class EnumerationIterator
      implements Iterator
   {
      Enumeration enum;

      public EnumerationIterator(Enumeration aEnum)
      {
         enum = aEnum;
      }

      public boolean hasNext()
      {
         return enum.hasMoreElements();
      }

      public Object next()
      {
         return enum.nextElement();
      }

      public void remove()
      {
         throw new UnsupportedOperationException("Remove is not supported in IteratorFilterSupport.");
      }
   }
}