/*

 * Copyright 2003 Sun Microsystems, Inc.  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.

 *

 * 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,

 * CA 95054 USA or visit www.sun.com if you need additional information or

 * have any questions.

 */

import java.lang.instrument.Instrumentation;

/*

 * Copyright 2003 Wily Technology, Inc.

 */

/**

 * A JPLIS agent that makes the Instrumentation available via a static accessor.

 * Used so that unit test frameworks that run as apps can exercise the Instrumentation--

 * configure this guy as a JPLIS agent, then call the Instrumentation fetcher from the test case.

 *

 */

public class InstrumentationHandoff

{

    private static Instrumentation      sInstrumentation;

    // disallow construction

    private

    InstrumentationHandoff()

        {

        }

    public static void

    premain(String options, Instrumentation inst)

    {

        System.out.println("InstrumentationHandoff JPLIS agent initialized");

        sInstrumentation = inst;

    }

    // may return null

    public static Instrumentation

    getInstrumentation()

    {

        return sInstrumentation;

    }

    public static Instrumentation

    getInstrumentationOrThrow()

    {

        Instrumentation result = getInstrumentation();

        if ( result == null )

            {

            throw new NullPointerException("instrumentation instance not initialized");

            }

        return result;

    }

}