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/* * Copyright (c) 1998, 2008, Oracle and/or its affiliates. All rights reserved. * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. * * This code is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License version 2 only, as * published by the Free Software Foundation.  Oracle designates this * particular file as subject to the "Classpath" exception as provided * by Oracle in the LICENSE file that accompanied this code. * * This code is distributed in the hope that it will be useful, but WITHOUT * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License * version 2 for more details (a copy is included in the LICENSE file that * accompanied this code). * * You should have received a copy of the GNU General Public License version * 2 along with this work; if not, write to the Free Software Foundation, * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. * * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA * or visit www.oracle.com if you need additional information or have any * questions. */ package com.sun.tools.example.debug.bdi; import com.sun.jdi.ThreadGroupReference;import com.sun.jdi.ThreadReference;import java.util.List;import java.util.Iterator; public class ThreadIterator implements Iterator<ThreadReference> {    Iterator<ThreadReference> it = null;    ThreadGroupIterator tgi;     public ThreadIterator(ThreadGroupReference tg) {        tgi = new ThreadGroupIterator(tg);    }     //### make this package access only?    public ThreadIterator(List<ThreadGroupReference> tgl) {        tgi = new ThreadGroupIterator(tgl);    }     @Override    public boolean hasNext() {        while (it == null || !it.hasNext()) {            if (!tgi.hasNext()) {                return false; // no more            }            it = tgi.nextThreadGroup().threads().iterator();        }        return true;    }     @Override    public ThreadReference next() {        return it.next();    }     public ThreadReference nextThread() {        return next();    }     @Override    public void remove() {        throw new UnsupportedOperationException();    }}