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      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
     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.
     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