package org.exolab.castor.mapping.loader.collection.handler;
   
   import java.util.Enumeration;
   import java.util.Iterator;
   
   import org.exolab.castor.mapping.CollectionHandler;
   import org.exolab.castor.mapping.loader.CollectionHandlers;
   import org.exolab.castor.mapping.loader.J2CollectionHandlers.IteratorEnumerator;
   
  public final class IteratorCollectionHandler<T> implements CollectionHandler<T> {
     public Object add(Object collection, T object) {
        // -- do nothing, cannot add elements to an
        // enumeration
        return null;
     }
  
     @SuppressWarnings("unchecked")
     public Enumeration<T> elements(Object collection) {
        if (collection == null) {
           return new CollectionHandlers.EmptyEnumerator<T>();
        }
        return new IteratorEnumerator<T>((Iterator<T>) collection);
     }
  
     public int size(Object collection) {
        // -- Nothing we can do without iterating over the
        // iterator
        return 0;
     }
  
     public Object clear(Object collection) {
        return null;
     }
  
     public String toString() {
        return "Iterator";
     }
  }