1 /*
2  * Copyright (c) 1998, 2019, Oracle and/or its affiliates. All rights reserved.
3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4  *
5  * This code is free software; you can redistribute it and/or modify it
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7  * published by the Free Software Foundation.  Oracle designates this
8  * particular file as subject to the "Classpath" exception as provided
9  * by Oracle in the LICENSE file that accompanied this code.
10  *
11  * This code is distributed in the hope that it will be useful, but WITHOUT
12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
14  * version 2 for more details (a copy is included in the LICENSE file that
15  * accompanied this code).
16  *
17  * You should have received a copy of the GNU General Public License version
18  * 2 along with this work; if not, write to the Free Software Foundation,
19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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24  */
25 
26 package com.sun.media.sound;
27 
28 import java.security.AccessController;
29 
30 import sun.security.action.GetPropertyAction;
31 
32 /**
33  * Printer allows you to set up global debugging status and print
34  * messages accordingly.
35  *
36  * @author David Rivas
37  * @author Kara Kytle
38  */
39 final class Printer {
40 
41     static final boolean err = isBuildInternal();
42 
43     private static final boolean SHOW_THREADID = true;
44     private static final boolean SHOW_TIMESTAMP = true;
45 
46     /**
47      * Suppresses default constructor, ensuring non-instantiability.
48      */
Printer()49     private Printer() {
50     }
51 
52     /**
53      * This method is used in the special cases which "should never happen...".
54      * And in fact if should be implemented as an assertion, but for
55      * compatibility reason it just print an error only in case of "internal"
56      * build. In time its usage should be replaced by some kind of assertion or
57      * dropped completly.
58      */
err(String str)59     public static void err(String str) {
60         if (err) {
61             println(str);
62         }
63     }
64 
65     /**
66      * Returns {@code true} if the build of the current jdk is "internal".
67      */
isBuildInternal()68     private static boolean isBuildInternal() {
69         String javaVersion = AccessController.doPrivileged(
70                 new GetPropertyAction("java.version"));
71         return javaVersion != null && javaVersion.contains("internal");
72     }
73 
74     private static long startTime = 0;
75 
println(String s)76     private static void println(String s) {
77         String prepend = "";
78         if (SHOW_THREADID) {
79             prepend = "thread "  + Thread.currentThread().getId() + " " + prepend;
80         }
81         if (SHOW_TIMESTAMP) {
82             if (startTime == 0) {
83                 startTime = System.nanoTime() / 1000000l;
84             }
85             prepend = prepend + ((System.nanoTime()/1000000l) - startTime) + "millis: ";
86         }
87         System.out.println(prepend + s);
88     }
89 }
90