1 /* 2 * Copyright (c) 2012, 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 libcore.net.MimeUtils; 30 31 /** 32 * File type detector that uses a file extension to look up its MIME type 33 * based on a mime.types file. 34 */ 35 36 class MimeTypesFileTypeDetector extends AbstractFileTypeDetector { 37 38 @Override implProbeContentType(Path path)39 protected String implProbeContentType(Path path) { 40 Path fn = path.getFileName(); 41 if (fn == null) 42 return null; // no file name 43 44 String ext = getExtension(fn.toString()); 45 if (ext.isEmpty()) 46 return null; // no extension 47 48 // Case-sensitive search 49 String mimeType; 50 do { 51 mimeType = MimeUtils.guessMimeTypeFromExtension(ext); 52 if (mimeType == null) 53 ext = getExtension(ext); 54 } while (mimeType == null && !ext.isEmpty()); 55 56 return mimeType; 57 } 58 59 // Get the extension of a file name. getExtension(String name)60 private static String getExtension(String name) { 61 String ext = ""; 62 if (name != null && !name.isEmpty()) { 63 int dot = name.indexOf('.'); 64 if ((dot >= 0) && (dot < name.length() - 1)) { 65 ext = name.substring(dot + 1); 66 } 67 } 68 return ext; 69 } 70 } 71