1 /*
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3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4  *
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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
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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 import java.security.PrivilegedAction;
30 import java.util.StringTokenizer;
31 
32 /**
33  * Audio configuration class for exposing attributes specific to the platform or system.
34  *
35  * @author Kara Kytle
36  * @author Florian Bomers
37  */
38 final class Platform {
39 
40     // native library we need to load
41     private static final String libName = "jsound";
42 
43     private static boolean isNativeLibLoaded;
44 
45     // SYSTEM CHARACTERISTICS
46     // vary according to hardware architecture
47 
48     // intel is little-endian.  sparc is big-endian.
49     private static boolean bigEndian;
50 
51     static {
loadLibraries()52         loadLibraries();
53     }
54 
55     /**
56      * Private constructor.
57      */
Platform()58     private Platform() {
59     }
60 
61     /**
62      * Dummy method for forcing initialization.
63      */
initialize()64     static void initialize() {
65     }
66 
67     /**
68      * Determine whether the system is big-endian.
69      */
isBigEndian()70     static boolean isBigEndian() {
71         return bigEndian;
72     }
73 
74     /**
75      * Load the native library or libraries.
76      */
loadLibraries()77     private static void loadLibraries() {
78         // load the native library
79         isNativeLibLoaded = true;
80         try {
81             AccessController.doPrivileged((PrivilegedAction<Void>) () -> {
82                 System.loadLibrary(libName);
83                 return null;
84             });
85         } catch (Throwable t) {
86             if (Printer.err) Printer.err("Couldn't load library "+libName+": "+t.toString());
87             isNativeLibLoaded = false;
88         }
89         if (isNativeLibLoaded) {
90             bigEndian = nIsBigEndian();
91         }
92     }
93 
isMidiIOEnabled()94     static boolean isMidiIOEnabled() {
95         return isNativeLibLoaded;
96     }
97 
isPortsEnabled()98     static boolean isPortsEnabled() {
99         return isNativeLibLoaded;
100     }
101 
isDirectAudioEnabled()102     static boolean isDirectAudioEnabled() {
103         return isNativeLibLoaded;
104     }
105 
106     // the following native method is implemented in Platform.c
nIsBigEndian()107     private static native boolean nIsBigEndian();
108 }
109