libjava/classpath/javax/activation/FileTypeMap.java

   1 /* FileTypeMap.java -- Classifies the MIME content of files.
   2    Copyright (C) 2004 Free Software Foundation, Inc.
   3
   4 This file is part of GNU Classpath.
   5
   6 GNU Classpath is free software; you can redistribute it and/or modify
   7 it under the terms of the GNU General Public License as published by
   8 the Free Software Foundation; either version 2, or (at your option)
   9 any later version.
  10
  11 GNU Classpath is distributed in the hope that it will be useful, but
  12 WITHOUT ANY WARRANTY; without even the implied warranty of
  13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14 General Public License for more details.
  15
  16 You should have received a copy of the GNU General Public License
  17 along with GNU Classpath; see the file COPYING.  If not, write to the
  18 Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
  19 02110-1301 USA.
  20
  21 Linking this library statically or dynamically with other modules is
  22 making a combined work based on this library.  Thus, the terms and
  23 conditions of the GNU General Public License cover the whole
  24 combination.
  25
  26 As a special exception, the copyright holders of this library give you
  27 permission to link this library with independent modules to produce an
  28 executable, regardless of the license terms of these independent
  29 modules, and to copy and distribute the resulting executable under
  30 terms of your choice, provided that you also meet, for each linked
  31 independent module, the terms and conditions of the license of that
  32 module.  An independent module is a module which is not derived from
  33 or based on this library.  If you modify this library, you may extend
  34 this exception to your version of the library, but you are not
  35 obligated to do so.  If you do not wish to do so, delete this
  36 exception statement from your version. */
  37
  38 package javax.activation;
  39
  40 import java.io.File;
  41
  42 /**
  43  * Classifier for the MIME content type of files.
  44  *
  45  * @author <a href='mailto:dog@gnu.org'>Chris Burdess</a>
  46  * @version 1.1
  47  */
  48 public abstract class FileTypeMap
  49 {
  50
  51   /* Class scope */
  52
  53   private static FileTypeMap defaultMap;
  54
  55   /**
  56    * Returns the system default file type map.
  57    * If one has not been set, this returns a MimetypesFileTypeMap.
  58    */
  59   public static FileTypeMap getDefaultFileTypeMap()
  60   {
  61     if (defaultMap == null)
  62       {
  63         defaultMap = new MimetypesFileTypeMap();
  64       }
  65     return defaultMap;
  66   }
  67
  68   /**
  69    * Sets the default file type map.
  70    * @param map the new file type map
  71    */
  72   public static void setDefaultFileTypeMap(FileTypeMap map)
  73   {
  74     SecurityManager security = System.getSecurityManager();
  75     if (security != null)
  76       {
  77         try
  78           {
  79             security.checkSetFactory();
  80           }
  81         catch (SecurityException e)
  82           {
  83             if (map != null && FileTypeMap.class.getClassLoader() !=
  84                 map.getClass().getClassLoader())
  85               {
  86                 throw e;
  87               }
  88           }
  89       }
  90     defaultMap = map;
  91   }
  92
  93   /* Instance scope */
  94
  95   /**
  96    * Returns the content type of the specified file.
  97    * @param file the file to classify
  98    */
  99   public abstract String getContentType(File file);
 100
 101   /**
 102    * Returns the content type of the specified file path.
 103    * @param filename the path of the file to classify
 104    */
 105   public abstract String getContentType(String filename);
 106
 107 }
 108