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 * 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.
 *
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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, Kara Kytle/**
 * 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.
/**
     * 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.
/**
     * 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 true if the build of the current jdk is "internal". /**
     * 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) {
            prepend = "thread "  + Thread.currentThread().getId() + " " + prepend;
        }
        if (SHOW_TIMESTAMP) {
            if (startTime == 0) {
                startTime = System.nanoTime() / 1000000l;
            }
            prepend = prepend + ((System.nanoTime()/1000000l) - startTime) + "millis: ";
        }
        System.out.println(prepend + s);
    }
}