1 /* 2 * Copyright (c) 2008, 2009, 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 sun.nio.fs; 27 28 import java.nio.file.Path; 29 import java.io.IOException; 30 import java.security.AccessController; 31 import java.security.PrivilegedAction; 32 33 /** 34 * File type detector that uses the GNOME I/O library or the deprecated 35 * GNOME VFS to guess the MIME type of a file. 36 */ 37 38 public class GnomeFileTypeDetector 39 extends AbstractFileTypeDetector 40 { 41 private static final String GNOME_VFS_MIME_TYPE_UNKNOWN = 42 "application/octet-stream"; 43 44 // true if GIO available 45 private final boolean gioAvailable; 46 47 // true if GNOME VFS available and GIO is not available 48 private final boolean gnomeVfsAvailable; 49 50 public GnomeFileTypeDetector() { 51 gioAvailable = initializeGio(); 52 if (gioAvailable) { 53 gnomeVfsAvailable = false; 54 } else { 55 gnomeVfsAvailable = initializeGnomeVfs(); 56 } 57 } 58 59 @Override 60 public String implProbeContentType(Path obj) throws IOException { 61 if (!gioAvailable && !gnomeVfsAvailable) 62 return null; 63 if (!(obj instanceof UnixPath)) 64 return null; 65 66 UnixPath path = (UnixPath)obj; 67 NativeBuffer buffer = NativeBuffers.asNativeBuffer(path.getByteArrayForSysCalls()); 68 try { 69 if (gioAvailable) { 70 byte[] type = probeUsingGio(buffer.address()); 71 return (type == null) ? null : new String(type); 72 } else { 73 byte[] type = probeUsingGnomeVfs(buffer.address()); 74 if (type == null) 75 return null; 76 String s = new String(type); 77 return s.equals(GNOME_VFS_MIME_TYPE_UNKNOWN) ? null : s; 78 } 79 80 } finally { 81 buffer.release(); 82 } 83 84 } 85 86 // GIO 87 private static native boolean initializeGio(); 88 private static native byte[] probeUsingGio(long pathAddress); 89 90 // GNOME VFS 91 private static native boolean initializeGnomeVfs(); 92 private static native byte[] probeUsingGnomeVfs(long pathAddress); 93 94 static { 95 AccessController.doPrivileged(new PrivilegedAction<Void>() { 96 public Void run() { 97 System.loadLibrary("nio"); 98 return null; 99 }}); 100 } 101 }