001/* DataContentHandler.java -- Converts streams to objects and vice versa. 002 Copyright (C) 2004 Free Software Foundation, Inc. 003 004This file is part of GNU Classpath. 005 006GNU Classpath is free software; you can redistribute it and/or modify 007it under the terms of the GNU General Public License as published by 008the Free Software Foundation; either version 2, or (at your option) 009any later version. 010 011GNU Classpath is distributed in the hope that it will be useful, but 012WITHOUT ANY WARRANTY; without even the implied warranty of 013MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 014General Public License for more details. 015 016You should have received a copy of the GNU General Public License 017along with GNU Classpath; see the file COPYING. If not, write to the 018Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 01902110-1301 USA. 020 021Linking this library statically or dynamically with other modules is 022making a combined work based on this library. Thus, the terms and 023conditions of the GNU General Public License cover the whole 024combination. 025 026As a special exception, the copyright holders of this library give you 027permission to link this library with independent modules to produce an 028executable, regardless of the license terms of these independent 029modules, and to copy and distribute the resulting executable under 030terms of your choice, provided that you also meet, for each linked 031independent module, the terms and conditions of the license of that 032module. An independent module is a module which is not derived from 033or based on this library. If you modify this library, you may extend 034this exception to your version of the library, but you are not 035obligated to do so. If you do not wish to do so, delete this 036exception statement from your version. */ 037 038package javax.activation; 039 040import java.awt.datatransfer.DataFlavor; 041import java.awt.datatransfer.UnsupportedFlavorException; 042import java.io.IOException; 043import 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 */ 051public 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