recyclablenamingenumeration.java

Tomcat 4.1与WebServer集成组件的源代码包.

/*
 * $Header: /home/cvs/jakarta-tomcat-connectors/naming/src/org/apache/naming/util/RecyclableNamingEnumeration.java,v 1.1 2002/10/01 18:49:49 costin Exp $
 * $Revision: 1.1 $
 * $Date: 2002/10/01 18:49:49 $
 *
 * ====================================================================
 *
 * The Apache Software License, Version 1.1
 *
 * Copyright (c) 1999 The Apache Software Foundation.  All rights 
 * reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer. 
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 *
 * 3. The end-user documentation included with the redistribution, if
 *    any, must include the following acknowlegement:  
 *       "This product includes software developed by the 
 *        Apache Software Foundation (http://www.apache.org/)."
 *    Alternately, this acknowlegement may appear in the software itself,
 *    if and wherever such third-party acknowlegements normally appear.
 *
 * 4. The names "The Jakarta Project", "Tomcat", and "Apache Software
 *    Foundation" must not be used to endorse or promote products derived
 *    from this software without prior written permission. For written 
 *    permission, please contact [e-mail].
 *
 * 5. Products derived from this software may not be called "Apache"
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 *
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 * ====================================================================
 *
 * This software consists of voluntary contributions made by many
 * individuals on behalf of the Apache Software Foundation.  For more
 * information on the Apache Software Foundation, please see
 * <http://www.apache.org/>.
 *
 * [Additional notices, if required by prior licensing conditions]
 *
 */ 


package org.apache.naming.util;

import java.util.Hashtable;
import java.util.Vector;
import java.util.Enumeration;
import javax.naming.NamingException;
import javax.naming.NamingEnumeration;
import javax.naming.NameClassPair;

/**
 * Naming enumeration implementation.
 *
 * @author Remy Maucherat
 * @version $Revision: 1.1 $ $Date: 2002/10/01 18:49:49 $
 */

public class RecyclableNamingEnumeration 
    implements NamingEnumeration {


    // ----------------------------------------------------------- Constructors


    public RecyclableNamingEnumeration(Vector entries) {
        this.entries = entries;
        recycle();
    }


    // -------------------------------------------------------------- Variables


    /**
     * Entries.
     */
    protected Vector entries;


    /**
     * Underlying enumeration.
     */
    protected Enumeration enum;


    // --------------------------------------------------------- Public Methods


    /**
     * Retrieves the next element in the enumeration.
     */
    public Object next()
        throws NamingException {
        return nextElement();
    }


    /**
     * Determines whether there are any more elements in the enumeration.
     */
    public boolean hasMore()
        throws NamingException {
        return enum.hasMoreElements();
    }


    /**
     * Closes this enumeration.
     */
    public void close()
        throws NamingException {
    }


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


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


    // -------------------------------------------------------- Package Methods


    /**
     * Recycle.
     */
    void recycle() {
        enum = entries.elements();
    }


}