/* 
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 * 
 *     http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */


package javax.naming;

import java.util.Enumeration;
import javax.naming.NamingException;

/**
 * A <code>NamingEnumeration</code> interface is an <code>Enumeration</code> 
 * which has been extended to support <code>NamingException</code>s. They can 
 * be thrown when getting the next element, checking if the Enumeration has 
 * more elements or on closing the <code>Enumeration</code>.
 * 
 */
public interface NamingEnumeration<T> extends Enumeration<T> {

    /*
     * -------------------------------------------------------------------
     * Methods
     * -------------------------------------------------------------------
     */

    /**
     * Get the next element.
     *
     * @return  the next element - can be null.
     * @exception NamingException if a naming error occurs
     * @exception java.util.NoSuchElementException when no more elements exist.
     */
    public T next() throws NamingException;

    /**
     * Check for more elements.
     *
     * @return  if more elements exist return true else return false.
     * @exception NamingException if a naming error occurs
     */
    public boolean hasMore() throws NamingException;

    /**
     * Close the enumeration.
     * 
     * @exception NamingException if a naming error occurs
     */
    public void close() throws NamingException;

}