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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 * published by the Free Software Foundation.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
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 * 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).
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package java.util;

import sun.util.logging.PlatformLogger;

import java.security.AccessController;
import java.security.PrivilegedAction;

Utility class for detecting inadvertent uses of boxing in java.util classes. The detection is turned on or off based on whether the system property org.openjdk.java.util.stream.tripwire is considered true according to Boolean.getBoolean(String). This should normally be turned off for production use. 
API Note:

Typical usage would be for boxing code to do:

    if (Tripwire.ENABLED)
        Tripwire.trip(getClass(), "{0} calling PrimitiveIterator.OfInt.nextInt()");
Since:
1.8/**
 * Utility class for detecting inadvertent uses of boxing in
 * {@code java.util} 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 PrimitiveIterator.OfInt.nextInt()");
 * }</pre>
 *
 * @since 1.8
 */
final class Tripwire {
    private static final String TRIPWIRE_PROPERTY = "org.openjdk.java.util.stream.tripwire";

    
Should debugging checks be enabled? /** Should debugging checks be enabled? */
    static final boolean ENABLED = AccessController.doPrivileged(
            (PrivilegedAction<Boolean>) () -> Boolean.getBoolean(TRIPWIRE_PROPERTY));

    private Tripwire() { }

    
Produces a log warning, using PlatformLogger.getLogger(className), using the supplied message. The class name of trippingClass will be used as the first parameter to the message. 
Params:
trippingClass – Name of the class generating the message
msg – A message format string of the type expected by PlatformLogger/**
     * 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());
    }
}