1 /* 2 * Copyright (c) 1999, 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 6 * under the terms of the GNU General Public License version 2 only, as 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. 20 * 21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 22 * or visit www.oracle.com if you need additional information or have any 23 * questions. 24 */ 25 26 package com.sun.media.sound; 27 28 import java.util.StringTokenizer; 29 30 /** 31 * Audio configuration class for exposing attributes specific to the platform or system. 32 * 33 * @author Kara Kytle 34 * @author Florian Bomers 35 */ 36 final class Platform { 37 38 // native library we need to load 39 private static final String libName = "jsound"; 40 41 private static boolean isNativeLibLoaded; 42 43 // SYSTEM CHARACTERISTICS 44 // vary according to hardware architecture 45 46 // intel is little-endian. sparc is big-endian. 47 private static boolean bigEndian; 48 49 static { 50 loadLibraries(); 51 } 52 53 /** 54 * Private constructor. 55 */ 56 private Platform() { 57 } 58 59 /** 60 * Dummy method for forcing initialization. 61 */ 62 static void initialize() { 63 } 64 65 /** 66 * Determine whether the system is big-endian. 67 */ 68 static boolean isBigEndian() { 69 return bigEndian; 70 } 71 72 /** 73 * Load the native library or libraries. 74 */ 75 private static void loadLibraries() { 76 // load the native library 77 isNativeLibLoaded = true; 78 try { 79 jdk.internal.access.SharedSecrets.getJavaLangAccess().loadLibrary(libName); 80 } catch (Throwable t) { 81 if (Printer.err) Printer.err("Couldn't load library "+libName+": "+t.toString()); 82 isNativeLibLoaded = false; 83 } 84 if (isNativeLibLoaded) { 85 bigEndian = nIsBigEndian(); 86 } 87 } 88 89 static boolean isMidiIOEnabled() { 90 return isNativeLibLoaded; 91 } 92 93 static boolean isPortsEnabled() { 94 return isNativeLibLoaded; 95 } 96 97 static boolean isDirectAudioEnabled() { 98 return isNativeLibLoaded; 99 } 100 101 // the following native method is implemented in Platform.c 102 private static native boolean nIsBigEndian(); 103 }