CompositeEnumeration.java revision 2224:2a8815d86b93 
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
33package jdk.test.lib.hprof.util;
34
35import java.util.Enumeration;
36import java.util.NoSuchElementException;
37import jdk.test.lib.hprof.model.JavaHeapObject;
38
39public 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}
64