/*

 * Copyright (c) 1998, 2011, 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.

 */

/*

 * This source code is provided to illustrate the usage of a given feature

 * or technique and has been deliberately simplified. Additional steps

 * required for a production-quality application, such as security checks,

 * input validation and proper error handling, might not be present in

 * this sample code.

 */

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();

    }

}