001    /* DataContentHandler.java -- Converts streams to objects and vice versa.
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.awt.datatransfer.DataFlavor;
041    import java.awt.datatransfer.UnsupportedFlavorException;
042    import java.io.IOException;
043    import java.io.OutputStream;
044    
045    /**
046     * Provider that can convert streams to objects and vice versa.
047     *
048     * @author <a href='mailto:dog@gnu.org'>Chris Burdess</a>
049     * @version 1.1
050     */
051    public interface DataContentHandler
052    {
053    
054      /**
055       * Returns a list of the flavors that data can be provided in, ordered
056       * by preference.
057       */
058      DataFlavor[] getTransferDataFlavors();
059      
060      /**
061       * Returns an object representing the data to be transferred.
062       * @param df the flavor representing the requested type
063       * @param ds the data source of the data to be converted
064       */
065      Object getTransferData(DataFlavor df, DataSource ds)
066        throws UnsupportedFlavorException, IOException;
067      
068      /**
069       * Returns an object representing the data in its most preferred form.
070       * @param ds the data source of the data to be converted
071       */
072      Object getContent(DataSource ds)
073        throws IOException;
074      
075      /**
076       * Writes the object as a stream of bytes.
077       * @param obj the object to convert
078       * @param mimeType the MIME type of the stream
079       * @param os the byte stream
080       */
081      void writeTo(Object obj, String mimeType, OutputStream os)
082        throws IOException;
083      
084    }
085