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 }