identityhashtableenumerator.java

JAVA 所有包

/*
 * @(#)IdentityHashtableEnumerator.java	1.3 05/11/17
 *
 * Copyright 2006 Sun Microsystems, Inc. All rights reserved.
 * SUN PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
 */

/*
 * Licensed Materials - Property of IBM
 * RMI-IIOP v1.0
 * Copyright IBM Corp. 1998 1999  All Rights Reserved
 *
 * US Government Users Restricted Rights - Use, duplication or
 * disclosure restricted by GSA ADP Schedule Contract with IBM Corp.
 */

package com.sun.corba.se.impl.util;

import java.util.Dictionary;
import java.util.Enumeration;
import java.util.NoSuchElementException;

/**
 * A hashtable enumerator class.  This class should remain opaque 
 * to the client. It will use the Enumeration interface. 
 */
class IdentityHashtableEnumerator implements Enumeration {
    boolean keys;
    int index;
    IdentityHashtableEntry table[];
    IdentityHashtableEntry entry;

    IdentityHashtableEnumerator(IdentityHashtableEntry table[], boolean keys) {
	this.table = table;
	this.keys = keys;
	this.index = table.length;
    }
	
    public boolean hasMoreElements() {
	if (entry != null) {
	    return true;
	}
	while (index-- > 0) {
	    if ((entry = table[index]) != null) {
		return true;
	    }
	}
	return false;
}

public Object nextElement() {
    if (entry == null) {
	while ((index-- > 0) && ((entry = table[index]) == null));
    }
    if (entry != null) {
	    IdentityHashtableEntry e = entry;
	entry = e.next;
	return keys ? e.key : e.value;
    }
	throw new NoSuchElementException("IdentityHashtableEnumerator");
    }
}