1 /* 2 * Copyright (c) 1997, 2012, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. Oracle designates this 8 * particular file as subject to the "Classpath" exception as provided 9 * by Oracle in the LICENSE file that accompanied this code. 10 * 11 * This code is distributed in the hope that it will be useful, but WITHOUT 12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 14 * version 2 for more details (a copy is included in the LICENSE file that 15 * accompanied this code). 16 * 17 * You should have received a copy of the GNU General Public License version 18 * 2 along with this work; if not, write to the Free Software Foundation, 19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 20 * 21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 22 * or visit www.oracle.com if you need additional information or have any 23 * questions. 24 */ 25 26 package javax.activation; 27 28 import java.io.InputStream; 29 import java.io.OutputStream; 30 import java.io.File; 31 import java.io.FileDescriptor; 32 import java.io.FileNotFoundException; 33 import java.io.FileInputStream; 34 import java.io.FileOutputStream; 35 import java.io.IOException; 36 import com.sun.activation.registries.MimeTypeFile; 37 38 /** 39 * The FileDataSource class implements a simple DataSource object 40 * that encapsulates a file. It provides data typing services via 41 * a FileTypeMap object. <p> 42 * 43 * <b>FileDataSource Typing Semantics</b><p> 44 * 45 * The FileDataSource class delegates data typing of files 46 * to an object subclassed from the FileTypeMap class. 47 * The <code>setFileTypeMap</code> method can be used to explicitly 48 * set the FileTypeMap for an instance of FileDataSource. If no 49 * FileTypeMap is set, the FileDataSource will call the FileTypeMap's 50 * getDefaultFileTypeMap method to get the System's default FileTypeMap. 51 * 52 * @see javax.activation.DataSource 53 * @see javax.activation.FileTypeMap 54 * @see javax.activation.MimetypesFileTypeMap 55 * 56 * @since 1.6 57 */ 58 public class FileDataSource implements DataSource { 59 60 // keep track of original 'ref' passed in, non-null 61 // one indicated which was passed in: 62 private File _file = null; 63 private FileTypeMap typeMap = null; 64 65 /** 66 * Creates a FileDataSource from a File object. <i>Note: 67 * The file will not actually be opened until a method is 68 * called that requires the file to be opened.</i> 69 * 70 * @param file the file 71 */ 72 public FileDataSource(File file) { 73 _file = file; // save the file Object... 74 } 75 76 /** 77 * Creates a FileDataSource from 78 * the specified path name. <i>Note: 79 * The file will not actually be opened until a method is 80 * called that requires the file to be opened.</i> 81 * 82 * @param name the system-dependent file name. 83 */ 84 public FileDataSource(String name) { 85 this(new File(name)); // use the file constructor 86 } 87 88 /** 89 * This method will return an InputStream representing the 90 * the data and will throw an IOException if it can 91 * not do so. This method will return a new 92 * instance of InputStream with each invocation. 93 * 94 * @return an InputStream 95 */ 96 public InputStream getInputStream() throws IOException { 97 return new FileInputStream(_file); 98 } 99 100 /** 101 * This method will return an OutputStream representing the 102 * the data and will throw an IOException if it can 103 * not do so. This method will return a new instance of 104 * OutputStream with each invocation. 105 * 106 * @return an OutputStream 107 */ 108 public OutputStream getOutputStream() throws IOException { 109 return new FileOutputStream(_file); 110 } 111 112 /** 113 * This method returns the MIME type of the data in the form of a 114 * string. This method uses the currently installed FileTypeMap. If 115 * there is no FileTypeMap explictly set, the FileDataSource will 116 * call the <code>getDefaultFileTypeMap</code> method on 117 * FileTypeMap to acquire a default FileTypeMap. <i>Note: By 118 * default, the FileTypeMap used will be a MimetypesFileTypeMap.</i> 119 * 120 * @return the MIME Type 121 * @see javax.activation.FileTypeMap#getDefaultFileTypeMap 122 */ 123 public String getContentType() { 124 // check to see if the type map is null? 125 if (typeMap == null) 126 return FileTypeMap.getDefaultFileTypeMap().getContentType(_file); 127 else 128 return typeMap.getContentType(_file); 129 } 130 131 /** 132 * Return the <i>name</i> of this object. The FileDataSource 133 * will return the file name of the object. 134 * 135 * @return the name of the object. 136 * @see javax.activation.DataSource 137 */ 138 public String getName() { 139 return _file.getName(); 140 } 141 142 /** 143 * Return the File object that corresponds to this FileDataSource. 144 * @return the File object for the file represented by this object. 145 */ 146 public File getFile() { 147 return _file; 148 } 149 150 /** 151 * Set the FileTypeMap to use with this FileDataSource 152 * 153 * @param map The FileTypeMap for this object. 154 */ 155 public void setFileTypeMap(FileTypeMap map) { 156 typeMap = map; 157 } 158 }