/*

 * Copyright (c) 2012, 2013, 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

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 */

package java.util.stream;

import java.security.AccessController;

import java.security.PrivilegedAction;

import sun.util.logging.PlatformLogger;

/**

 * Utility class for detecting inadvertent uses of boxing in

 * {@code java.util.stream} classes.  The detection is turned on or off based on

 * whether the system property {@code org.openjdk.java.util.stream.tripwire} is

 * considered {@code true} according to {@link Boolean#getBoolean(String)}.

 * This should normally be turned off for production use.

 *

 * @apiNote

 * Typical usage would be for boxing code to do:

 * <pre>{@code

 *     if (Tripwire.ENABLED)

 *         Tripwire.trip(getClass(), "{0} calling Sink.OfInt.accept(Integer)");

 * }</pre>

 *

 * @since 1.8

 */

final class Tripwire {

    private static final String TRIPWIRE_PROPERTY = "org.openjdk.java.util.stream.tripwire";

    /** Should debugging checks be enabled? */

    static final boolean ENABLED = AccessController.doPrivileged(

            (PrivilegedAction<Boolean>) () -> Boolean.getBoolean(TRIPWIRE_PROPERTY));

    private Tripwire() { }

    /**

     * Produces a log warning, using {@code PlatformLogger.getLogger(className)},

     * using the supplied message.  The class name of {@code trippingClass} will

     * be used as the first parameter to the message.

     *

     * @param trippingClass Name of the class generating the message

     * @param msg A message format string of the type expected by

     * {@link PlatformLogger}

     */

    static void trip(Class<?> trippingClass, String msg) {

        PlatformLogger.getLogger(trippingClass.getName()).warning(msg, trippingClass.getName());

    }

}