Examples of com.google.code.javax.activation.DataHandler

Package com.google.code.javax.activation

Examples of com.google.code.javax.activation.DataHandler

com.google.code.javax.activation.DataHandler
The DataHandler class provides a consistent interface to data available in many different sources and formats. It manages simple stream to string conversions and related operations using DataContentHandlers. It provides access to commands that can operate on the data. The commands are found using a CommandMap.
DataHandler and the Transferable Interface
DataHandler implements the Transferable interface so that data can be used in AWT data transfer operations, such as cut and paste and drag and drop. The implementation of the Transferable interface relies on the availability of an installed DataContentHandler object corresponding to the MIME type of the data represented in the specific instance of the DataHandler.
DataHandler and CommandMaps
The DataHandler keeps track of the current CommandMap that it uses to service requests for commands (getCommand, getAllCommands, getPreferredCommands). Each instance of a DataHandler may have a CommandMap associated with it using the setCommandMap method. If a CommandMap was not set, DataHandler calls the getDefaultCommandMap method in CommandMap and uses the value it returns. See CommandMap for more information.
DataHandler and URLs
The current DataHandler implementation creates a private instance of URLDataSource when it is constructed with a URL. @see javax.activation.CommandMap @see javax.activation.DataContentHandler @see javax.activation.DataSource @see javax.activation.URLDataSource

    public void setContent(Object o, String type) 
      throws MessagingException {
  if (o instanceof Multipart)
      setContent((Multipart)o);
  else
      setDataHandler(new DataHandler(o, type));
    }

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     * @exception  IllegalStateException if this message is
     *      obtained from a READ_ONLY folder.
     * @exception       MessagingException
     */
    public void setContent(Multipart mp) throws MessagingException {
  setDataHandler(new DataHandler(mp, mp.getContentType()));
  mp.setParent(this);
    }

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   * we're now committed to using this instance of the
   * object and we discard any stream data used to create
   * this object.
   */
  if (cachedContent != null) {
      dh = new DataHandler(cachedContent, getContentType());
      cachedContent = null;
      content = null;
      if (contentStream != null) {
    try {
        contentStream.close();

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    public synchronized DataHandler getDataHandler() 
    throws MessagingException {
  if (dh == null) {
     if (bs.isMulti())
    dh = new DataHandler(
      new IMAPMultipartDataSource(
        this, bs.bodies, sectionId, message)
         );
      else if (bs.isNested() && message.isREV1())
    dh = new DataHandler(
      new IMAPNestedMessage(message, 
                bs.bodies[0],
                bs.envelope,
                sectionId),
      type

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    public void setContent(Object o, String type) 
    throws MessagingException {
  if (o instanceof Multipart) {
      setContent((Multipart)o);
  } else {
      setDataHandler(new DataHandler(o, type));
  }
    }

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     *      existing values.
     * @exception  IllegalStateException if this body part is
     *      obtained from a READ_ONLY folder.
     */
    public void setContent(Multipart mp) throws MessagingException {
  setDataHandler(new DataHandler(mp, mp.getContentType()));
  mp.setParent(this);
    }

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     * @exception  MessagingException  message related errors
     * @since    JavaMail 1.4
     */
    public void attachFile(File file) throws IOException, MessagingException {
      FileDataSource fds = new FileDataSource(file);     
        this.setDataHandler(new DataHandler(fds));
        this.setFileName(fds.getName());
    }

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   * we're now committed to using this instance of the
   * object and we discard any stream data used to create
   * this object.
   */
  if (cachedContent != null) {
      dh = new DataHandler(cachedContent, getContentType());
      cachedContent = null;
      content = null;
      if (contentStream != null) {
    try {
        contentStream.close();

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  }
  return encoding;
    }


    static void updateHeaders(MimePart part) throws MessagingException {
  DataHandler dh = part.getDataHandler();
  if (dh == null) // Huh ?
      return;


  try {
      String type = dh.getContentType();
      boolean composite = false;
      boolean needCTHeader = part.getHeader("Content-Type") == null;


      ContentType cType = new ContentType(type);


      /*
       * If this is a multipart, give sub-parts a chance to
       * update their headers.  Even though the data for this
       * multipart may have come from a stream, one of the
       * sub-parts may have been updated.
       */
      if (cType.match("multipart/*")) {
    // If multipart, recurse
    composite = true;
    Object o;
    if (part instanceof MimeBodyPart) {
        MimeBodyPart mbp = (MimeBodyPart)part;
        o = mbp.cachedContent != null ?
        mbp.cachedContent : dh.getContent();
    } else if (part instanceof MimeMessage) {
        MimeMessage msg = (MimeMessage)part;
        o = msg.cachedContent != null ?
        msg.cachedContent : dh.getContent();
    } else
        o = dh.getContent();
    if (o instanceof MimeMultipart)
        ((MimeMultipart)o).updateHeaders();
    else
        throw new MessagingException("MIME part of type \"" +
      type + "\" contains object of type " +

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      /*
       * If the data for this part comes from a stream,
       * just copy it to the output stream without decoding
       * and reencoding it.
       */
      DataHandler dh = part.getDataHandler();
      if (dh instanceof MimePartDataHandler) {
    // call getContentStream to give subclass a chance to
    // provide the data on demand
    if (part instanceof MimeBodyPart) {
        MimeBodyPart mbp = (MimeBodyPart)part;

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