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| 1 | +/* | |
| 2 | + * Copyright (c) 1998, 2008, 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 | +package com.sun.tools.example.debug.tty; | |
| 27 | + | |
| 28 | +import com.sun.jdi.ThreadGroupReference; | |
| 29 | +import java.util.List; | |
| 30 | +import java.util.Stack; | |
| 31 | +import java.util.ArrayList; | |
| 32 | +import java.util.Iterator; | |
| 33 | + | |
| 34 | +/** | |
| 35 | + * Descend the tree of thread groups. | |
| 36 | + * @author Robert G. Field | |
| 37 | + */ | |
| 38 | +class ThreadGroupIterator implements Iterator<ThreadGroupReference> { | |
| 39 | + private final Stack<Iterator<ThreadGroupReference>> stack = new Stack<Iterator<ThreadGroupReference>>(); | |
| 40 | + | |
| 41 | + ThreadGroupIterator(List<ThreadGroupReference> tgl) { | |
| 42 | + push(tgl); | |
| 43 | + } | |
| 44 | + | |
| 45 | + ThreadGroupIterator(ThreadGroupReference tg) { | |
| 46 | + List<ThreadGroupReference> tgl = new ArrayList<ThreadGroupReference>(); | |
| 47 | + tgl.add(tg); | |
| 48 | + push(tgl); | |
| 49 | + } | |
| 50 | + | |
| 51 | + ThreadGroupIterator() { | |
| 52 | + this(Env.vm().topLevelThreadGroups()); | |
| 53 | + } | |
| 54 | + | |
| 55 | + private Iterator<ThreadGroupReference> top() { | |
| 56 | + return stack.peek(); | |
| 57 | + } | |
| 58 | + | |
| 59 | + /** | |
| 60 | + * The invariant in this class is that the top iterator | |
| 61 | + * on the stack has more elements. If the stack is | |
| 62 | + * empty, there is no top. This method assures | |
| 63 | + * this invariant. | |
| 64 | + */ | |
| 65 | + private void push(List<ThreadGroupReference> tgl) { | |
| 66 | + stack.push(tgl.iterator()); | |
| 67 | + while (!stack.isEmpty() && !top().hasNext()) { | |
| 68 | + stack.pop(); | |
| 69 | + } | |
| 70 | + } | |
| 71 | + | |
| 72 | + @Override | |
| 73 | + public boolean hasNext() { | |
| 74 | + return !stack.isEmpty(); | |
| 75 | + } | |
| 76 | + | |
| 77 | + @Override | |
| 78 | + public ThreadGroupReference next() { | |
| 79 | + return nextThreadGroup(); | |
| 80 | + } | |
| 81 | + | |
| 82 | + public ThreadGroupReference nextThreadGroup() { | |
| 83 | + ThreadGroupReference tg = top().next(); | |
| 84 | + push(tg.threadGroups()); | |
| 85 | + return tg; | |
| 86 | + } | |
| 87 | + | |
| 88 | + @Override | |
| 89 | + public void remove() { | |
| 90 | + throw new UnsupportedOperationException(); | |
| 91 | + } | |
| 92 | + | |
| 93 | + static ThreadGroupReference find(String name) { | |
| 94 | + ThreadGroupIterator tgi = new ThreadGroupIterator(); | |
| 95 | + while (tgi.hasNext()) { | |
| 96 | + ThreadGroupReference tg = tgi.nextThreadGroup(); | |
| 97 | + if (tg.name().equals(name)) { | |
| 98 | + return tg; | |
| 99 | + } | |
| 100 | + } | |
| 101 | + return null; | |
| 102 | + } | |
| 103 | + | |
| 104 | +} | |