1 /* DataSourceDataContentHolder.java -- DCH using an existing data source. 2 Copyright (C) 2004 Free Software Foundation, Inc. 3 4 This file is part of GNU Classpath. 5 6 GNU Classpath is free software; you can redistribute it and/or modify 7 it under the terms of the GNU General Public License as published by 8 the Free Software Foundation; either version 2, or (at your option) 9 any later version. 10 11 GNU Classpath is distributed in the hope that it will be useful, but 12 WITHOUT ANY WARRANTY; without even the implied warranty of 13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 14 General Public License for more details. 15 16 You should have received a copy of the GNU General Public License 17 along with GNU Classpath; see the file COPYING. If not, write to the 18 Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 19 02110-1301 USA. 20 21 Linking this library statically or dynamically with other modules is 22 making a combined work based on this library. Thus, the terms and 23 conditions of the GNU General Public License cover the whole 24 combination. 25 26 As a special exception, the copyright holders of this library give you 27 permission to link this library with independent modules to produce an 28 executable, regardless of the license terms of these independent 29 modules, and to copy and distribute the resulting executable under 30 terms of your choice, provided that you also meet, for each linked 31 independent module, the terms and conditions of the license of that 32 module. An independent module is a module which is not derived from 33 or based on this library. If you modify this library, you may extend 34 this exception to your version of the library, but you are not 35 obligated to do so. If you do not wish to do so, delete this 36 exception statement from your version. */ 37 38 package javax.activation; 39 40 import java.awt.datatransfer.DataFlavor; 41 import java.awt.datatransfer.UnsupportedFlavorException; 42 import java.io.IOException; 43 import java.io.OutputStream; 44 45 /** 46 * Data content handler using an existing DCH and a data source. 47 * 48 * @author <a href='mailto:dog@gnu.org'>Chris Burdess</a> 49 * @version 1.1 50 */ 51 class DataSourceDataContentHandler 52 implements DataContentHandler 53 { 54 55 private DataSource ds; 56 private DataFlavor[] flavors; 57 private DataContentHandler dch; 58 DataSourceDataContentHandler(DataContentHandler dch, DataSource ds)59 public DataSourceDataContentHandler(DataContentHandler dch, DataSource ds) 60 { 61 this.ds = ds; 62 this.dch = dch; 63 } 64 getContent(DataSource ds)65 public Object getContent(DataSource ds) 66 throws IOException 67 { 68 if (dch != null) 69 { 70 return dch.getContent(ds); 71 } 72 else 73 { 74 return ds.getInputStream(); 75 } 76 } 77 getTransferData(DataFlavor flavor, DataSource ds)78 public Object getTransferData(DataFlavor flavor, DataSource ds) 79 throws UnsupportedFlavorException, IOException 80 { 81 if (dch != null) 82 { 83 return dch.getTransferData(flavor, ds); 84 } 85 DataFlavor[] tdf = getTransferDataFlavors(); 86 if (tdf.length > 0 && flavor.equals(tdf[0])) 87 { 88 return ds.getInputStream(); 89 } 90 else 91 { 92 throw new UnsupportedFlavorException(flavor); 93 } 94 } 95 getTransferDataFlavors()96 public DataFlavor[] getTransferDataFlavors() 97 { 98 if (flavors == null) 99 { 100 if (dch != null) 101 { 102 flavors = dch.getTransferDataFlavors(); 103 } 104 else 105 { 106 String mimeType = ds.getContentType(); 107 flavors = new DataFlavor[1]; 108 flavors[0] = new ActivationDataFlavor(mimeType, mimeType); 109 } 110 } 111 return flavors; 112 } 113 writeTo(Object obj, String mimeType, OutputStream out)114 public void writeTo(Object obj, String mimeType, OutputStream out) 115 throws IOException 116 { 117 if (dch == null) 118 { 119 throw new UnsupportedDataTypeException("no DCH for content type " + 120 ds.getContentType()); 121 } 122 dch.writeTo(obj, mimeType, out); 123 } 124 125 } 126