+ * + * FileDataSource Typing Semantics
+ *
+ * The FileDataSource class delegates data typing of files
+ * to an object subclassed from the FileTypeMap class.
+ * The setFileTypeMap method can be used to explicitly
+ * set the FileTypeMap for an instance of FileDataSource. If no
+ * FileTypeMap is set, the FileDataSource will call the FileTypeMap's
+ * getDefaultFileTypeMap method to get the System's default FileTypeMap.
+ *
+ * @see javax.activation.DataSource
+ * @see javax.activation.FileTypeMap
+ * @see javax.activation.MimetypesFileTypeMap
+ *
+ * @since 1.6
+ */
+public class FileDataSource implements DataSource {
+
+ // keep track of original 'ref' passed in, non-null
+ // one indicated which was passed in:
+ private File _file = null;
+ private FileTypeMap typeMap = null;
+
+ /**
+ * Creates a FileDataSource from a File object. Note:
+ * The file will not actually be opened until a method is
+ * called that requires the file to be opened.
+ *
+ * @param file the file
+ */
+ public FileDataSource(File file) {
+ _file = file; // save the file Object...
+ }
+
+ /**
+ * Creates a FileDataSource from
+ * the specified path name. Note:
+ * The file will not actually be opened until a method is
+ * called that requires the file to be opened.
+ *
+ * @param name the system-dependent file name.
+ */
+ public FileDataSource(String name) {
+ this(new File(name)); // use the file constructor
+ }
+
+ /**
+ * This method will return an InputStream representing the
+ * the data and will throw an IOException if it can
+ * not do so. This method will return a new
+ * instance of InputStream with each invocation.
+ *
+ * @return an InputStream
+ */
+ public InputStream getInputStream() throws IOException {
+ return new FileInputStream(_file);
+ }
+
+ /**
+ * This method will return an OutputStream representing the
+ * the data and will throw an IOException if it can
+ * not do so. This method will return a new instance of
+ * OutputStream with each invocation.
+ *
+ * @return an OutputStream
+ */
+ public OutputStream getOutputStream() throws IOException {
+ return new FileOutputStream(_file);
+ }
+
+ /**
+ * This method returns the MIME type of the data in the form of a
+ * string. This method uses the currently installed FileTypeMap. If
+ * there is no FileTypeMap explictly set, the FileDataSource will
+ * call the getDefaultFileTypeMap method on
+ * FileTypeMap to acquire a default FileTypeMap. Note: By
+ * default, the FileTypeMap used will be a MimetypesFileTypeMap.
+ *
+ * @return the MIME Type
+ * @see javax.activation.FileTypeMap#getDefaultFileTypeMap
+ */
+ public String getContentType() {
+ // check to see if the type map is null?
+ if (typeMap == null)
+ return FileTypeMap.getDefaultFileTypeMap().getContentType(_file);
+ else
+ return typeMap.getContentType(_file);
+ }
+
+ /**
+ * Return the name of this object. The FileDataSource
+ * will return the file name of the object.
+ *
+ * @return the name of the object.
+ * @see javax.activation.DataSource
+ */
+ public String getName() {
+ return _file.getName();
+ }
+
+ /**
+ * Return the File object that corresponds to this FileDataSource.
+ * @return the File object for the file represented by this object.
+ */
+ public File getFile() {
+ return _file;
+ }
+
+ /**
+ * Set the FileTypeMap to use with this FileDataSource
+ *
+ * @param map The FileTypeMap for this object.
+ */
+ public void setFileTypeMap(FileTypeMap map) {
+ typeMap = map;
+ }
+}