/*
 * Copyright (c) 2012, 2013, Oracle and/or its affiliates. All rights reserved.
 * ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
 *
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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
 * {@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? */
 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());
 }
}