1/*
2 * Copyright (c) 1998, 2011, 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 * This source code is provided to illustrate the usage of a given feature
28 * or technique and has been deliberately simplified. Additional steps
29 * required for a production-quality application, such as security checks,
30 * input validation and proper error handling, might not be present in
31 * this sample code.
32 */
33
34
35package com.sun.tools.example.debug.tty;
36
37import com.sun.jdi.ThreadGroupReference;
38import com.sun.jdi.ThreadReference;
39import java.util.List;
40import java.util.Iterator;
41
42class ThreadIterator implements Iterator<ThreadReference> {
43    Iterator<ThreadReference> it = null;
44    ThreadGroupIterator tgi;
45
46    ThreadIterator(ThreadGroupReference tg) {
47        tgi = new ThreadGroupIterator(tg);
48    }
49
50    ThreadIterator(List<ThreadGroupReference> tgl) {
51        tgi = new ThreadGroupIterator(tgl);
52    }
53
54    ThreadIterator() {
55        tgi = new ThreadGroupIterator();
56    }
57
58    @Override
59    public boolean hasNext() {
60        while (it == null || !it.hasNext()) {
61            if (!tgi.hasNext()) {
62                return false; // no more
63            }
64            it = tgi.nextThreadGroup().threads().iterator();
65        }
66        return true;
67    }
68
69    @Override
70    public ThreadReference next() {
71        return it.next();
72    }
73
74    public ThreadReference nextThread() {
75        return next();
76    }
77
78    @Override
79    public void remove() {
80        throw new UnsupportedOperationException();
81    }
82}
83