package org.webslinger.commons.vfs.util;

 import java.util.Iterator;

 public class IteratorWrapper<T> implements Iterator<T> {

     protected Iterator<T> it;

     protected IteratorRemover remover;

     protected T lastObject;

     protected int serialNumber;

     protected IteratorOwner owner;

     public IteratorWrapper(Iterator<T> it, IteratorRemover remover, IteratorOwner owner) {

         this.it = it;

         this.remover = remover;

         this.owner = owner;

         serialNumber = owner.getSerialNumber();

     }

     protected void checkRemoved() {

         if (owner.getSerialNumber() != serialNumber) throw new IllegalStateException("removed");

     }

     public void remove() {

         checkRemoved();

         it.remove();

         remover.remove(lastObject);

     }

     public T next() {

         checkRemoved();

         return lastObject = it.next();

     }

     public boolean hasNext() {

         checkRemoved();

         return it.hasNext();

     }

 }