001    /* FileTypeMap.java -- Classifies the MIME content of files.
002       Copyright (C) 2004 Free Software Foundation, Inc.
003    
004    This file is part of GNU Classpath.
005    
006    GNU Classpath is free software; you can redistribute it and/or modify
007    it under the terms of the GNU General Public License as published by
008    the Free Software Foundation; either version 2, or (at your option)
009    any later version.
010    
011    GNU Classpath is distributed in the hope that it will be useful, but
012    WITHOUT ANY WARRANTY; without even the implied warranty of
013    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
014    General Public License for more details.
015    
016    You should have received a copy of the GNU General Public License
017    along with GNU Classpath; see the file COPYING.  If not, write to the
018    Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
019    02110-1301 USA.
020    
021    Linking this library statically or dynamically with other modules is
022    making a combined work based on this library.  Thus, the terms and
023    conditions of the GNU General Public License cover the whole
024    combination.
025    
026    As a special exception, the copyright holders of this library give you
027    permission to link this library with independent modules to produce an
028    executable, regardless of the license terms of these independent
029    modules, and to copy and distribute the resulting executable under
030    terms of your choice, provided that you also meet, for each linked
031    independent module, the terms and conditions of the license of that
032    module.  An independent module is a module which is not derived from
033    or based on this library.  If you modify this library, you may extend
034    this exception to your version of the library, but you are not
035    obligated to do so.  If you do not wish to do so, delete this
036    exception statement from your version. */
037    
038    package javax.activation;
039    
040    import java.io.File;
041    
042    /**
043     * Classifier for the MIME content type of files.
044     *
045     * @author <a href='mailto:dog@gnu.org'>Chris Burdess</a>
046     * @version 1.1
047     */
048    public abstract class FileTypeMap
049    {
050    
051      /* Class scope */
052    
053      private static FileTypeMap defaultMap;
054    
055      /**
056       * Returns the system default file type map.
057       * If one has not been set, this returns a MimetypesFileTypeMap.
058       */
059      public static FileTypeMap getDefaultFileTypeMap()
060      {
061        if (defaultMap == null)
062          {
063            defaultMap = new MimetypesFileTypeMap();
064          }
065        return defaultMap;
066      }
067    
068      /**
069       * Sets the default file type map.
070       * @param map the new file type map
071       */
072      public static void setDefaultFileTypeMap(FileTypeMap map)
073      {
074        SecurityManager security = System.getSecurityManager();
075        if (security != null)
076          {
077            try
078              {
079                security.checkSetFactory();
080              }
081            catch (SecurityException e)
082              {
083                if (map != null && FileTypeMap.class.getClassLoader() !=
084                    map.getClass().getClassLoader())
085                  {
086                    throw e;
087                  }
088              }
089          }
090        defaultMap = map;
091      }
092    
093      /* Instance scope */
094    
095      /**
096       * Returns the content type of the specified file.
097       * @param file the file to classify
098       */
099      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    }