JDK14/Java14源码在线阅读

/*
 * Copyright (c) 1998, 2019, 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 com.sun.media.sound;

import java.security.AccessController;

import sun.security.action.GetPropertyAction;

/**
 * Printer allows you to set up global debugging status and print
 * messages accordingly.
 *
 * @author David Rivas
 * @author Kara Kytle
 */
final class Printer {

    static final boolean err = isBuildInternal();

    private static final boolean SHOW_THREADID = true;
    private static final boolean SHOW_TIMESTAMP = true;

    /**
     * Suppresses default constructor, ensuring non-instantiability.
     */
    private Printer() {
    }

    /**
     * This method is used in the special cases which "should never happen...".
     * And in fact if should be implemented as an assertion, but for
     * compatibility reason it just print an error only in case of "internal"
     * build. In time its usage should be replaced by some kind of assertion or
     * dropped completly.
     */
    public static void err(String str) {
        if (err) {
            println(str);
        }
    }

    /**
     * Returns {@code true} if the build of the current jdk is "internal".
     */
    private static boolean isBuildInternal() {
        String javaVersion = AccessController.doPrivileged(
                new GetPropertyAction("java.version"));
        return javaVersion != null && javaVersion.contains("internal");
    }

    private static long startTime = 0;

    private static void println(String s) {
        String prepend = "";
        if (SHOW_THREADID) {

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