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 
  35 package com.sun.tools.example.debug.bdi;
  36 
  37 import com.sun.jdi.ThreadGroupReference;
  38 import com.sun.jdi.ThreadReference;
  39 import java.util.List;
  40 import java.util.Iterator;
  41 
  42 public class ThreadIterator implements Iterator<ThreadReference> {
  43     Iterator<ThreadReference> it = null;
  44     ThreadGroupIterator tgi;
  45 
  46     public ThreadIterator(ThreadGroupReference tg) {
  47         tgi = new ThreadGroupIterator(tg);
  48     }
  49 
  50     //### make this package access only?
  51     public ThreadIterator(List<ThreadGroupReference> tgl) {
  52         tgi = new ThreadGroupIterator(tgl);
  53     }
  54 
  55     @Override
  56     public boolean hasNext() {
  57         while (it == null || !it.hasNext()) {
  58             if (!tgi.hasNext()) {
  59                 return false; // no more
  60             }
  61             it = tgi.nextThreadGroup().threads().iterator();
  62         }
  63         return true;
  64     }
  65 
  66     @Override
  67     public ThreadReference next() {
  68         return it.next();
  69     }
  70 
  71     public ThreadReference nextThread() {
  72         return next();
  73     }
  74 
  75     @Override
  76     public void remove() {
  77         throw new UnsupportedOperationException();
  78     }
  79 }