1 /*
   2  * Copyright (c) 1997, 2016, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.  Oracle designates this
   8  * particular file as subject to the "Classpath" exception as provided
   9  * by Oracle in the LICENSE file that accompanied this code.
  10  *
  11  * This code is distributed in the hope that it will be useful, but WITHOUT
  12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  14  * version 2 for more details (a copy is included in the LICENSE file that
  15  * accompanied this code).
  16  *
  17  * You should have received a copy of the GNU General Public License version
  18  * 2 along with this work; if not, write to the Free Software Foundation,
  19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  20  *
  21  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  22  * or visit www.oracle.com if you need additional information or have any
  23  * questions.
  24  */
  25 
  26 
  27 /*
  28  * The Original Code is HAT. The Initial Developer of the
  29  * Original Code is Bill Foote, with contributions from others
  30  * at JavaSoft/Sun.
  31  */
  32 
  33 package jdk.test.lib.hprof.util;
  34 
  35 import java.util.Enumeration;
  36 import java.util.NoSuchElementException;
  37 import jdk.test.lib.hprof.model.JavaHeapObject;
  38 
  39 public class CompositeEnumeration implements Enumeration<JavaHeapObject> {
  40     Enumeration<JavaHeapObject> e1;
  41     Enumeration<JavaHeapObject> e2;
  42 
  43     public CompositeEnumeration(Enumeration<JavaHeapObject> e1, Enumeration<JavaHeapObject> e2) {
  44         this.e1 = e1;
  45         this.e2 = e2;
  46     }
  47 
  48     public boolean hasMoreElements() {
  49         return e1.hasMoreElements() || e2.hasMoreElements();
  50     }
  51 
  52     public JavaHeapObject nextElement() {
  53         if (e1.hasMoreElements()) {
  54             return e1.nextElement();
  55         }
  56 
  57         if (e2.hasMoreElements()) {
  58             return e2.nextElement();
  59         }
  60 
  61         throw new NoSuchElementException();
  62     }
  63 }