001/* FileTypeMap.java -- Classifies the MIME content of files.
002   Copyright (C) 2004 Free Software Foundation, Inc.
003
004This file is part of GNU Classpath.
005
006GNU Classpath is free software; you can redistribute it and/or modify
007it under the terms of the GNU General Public License as published by
008the Free Software Foundation; either version 2, or (at your option)
009any later version.
010
011GNU Classpath is distributed in the hope that it will be useful, but
012WITHOUT ANY WARRANTY; without even the implied warranty of
013MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
014General Public License for more details.
015
016You should have received a copy of the GNU General Public License
017along with GNU Classpath; see the file COPYING.  If not, write to the
018Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
01902110-1301 USA.
020
021Linking this library statically or dynamically with other modules is
022making a combined work based on this library.  Thus, the terms and
023conditions of the GNU General Public License cover the whole
024combination.
025
026As a special exception, the copyright holders of this library give you
027permission to link this library with independent modules to produce an
028executable, regardless of the license terms of these independent
029modules, and to copy and distribute the resulting executable under
030terms of your choice, provided that you also meet, for each linked
031independent module, the terms and conditions of the license of that
032module.  An independent module is a module which is not derived from
033or based on this library.  If you modify this library, you may extend
034this exception to your version of the library, but you are not
035obligated to do so.  If you do not wish to do so, delete this
036exception statement from your version. */
037
038package javax.activation;
039
040import 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 */
048public 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}