Source for javax.activation.FileTypeMap

   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: }