J. Duke | 319a3b9 | 2007-12-01 00:00:00 +0000 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright 2000-2002 Sun Microsystems, Inc. All Rights Reserved. |
| 3 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| 4 | * |
| 5 | * This code is free software; you can redistribute it and/or modify it |
| 6 | * under the terms of the GNU General Public License version 2 only, as |
| 7 | * published by the Free Software Foundation. Sun designates this |
| 8 | * particular file as subject to the "Classpath" exception as provided |
| 9 | * by Sun in the LICENSE file that accompanied this code. |
| 10 | * |
| 11 | * This code is distributed in the hope that it will be useful, but WITHOUT |
| 12 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| 13 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| 14 | * version 2 for more details (a copy is included in the LICENSE file that |
| 15 | * accompanied this code). |
| 16 | * |
| 17 | * You should have received a copy of the GNU General Public License version |
| 18 | * 2 along with this work; if not, write to the Free Software Foundation, |
| 19 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| 20 | * |
| 21 | * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, |
| 22 | * CA 95054 USA or visit www.sun.com if you need additional information or |
| 23 | * have any questions. |
| 24 | */ |
| 25 | package javax.swing.plaf.basic; |
| 26 | |
| 27 | import java.io.*; |
| 28 | import java.awt.datatransfer.*; |
| 29 | import javax.swing.plaf.UIResource; |
| 30 | |
| 31 | /** |
| 32 | * A transferable implementation for the default data transfer of some Swing |
| 33 | * components. |
| 34 | * |
| 35 | * @author Timothy Prinzing |
| 36 | */ |
| 37 | class BasicTransferable implements Transferable, UIResource { |
| 38 | |
| 39 | protected String plainData; |
| 40 | protected String htmlData; |
| 41 | |
| 42 | private static DataFlavor[] htmlFlavors; |
| 43 | private static DataFlavor[] stringFlavors; |
| 44 | private static DataFlavor[] plainFlavors; |
| 45 | |
| 46 | static { |
| 47 | try { |
| 48 | htmlFlavors = new DataFlavor[3]; |
| 49 | htmlFlavors[0] = new DataFlavor("text/html;class=java.lang.String"); |
| 50 | htmlFlavors[1] = new DataFlavor("text/html;class=java.io.Reader"); |
| 51 | htmlFlavors[2] = new DataFlavor("text/html;charset=unicode;class=java.io.InputStream"); |
| 52 | |
| 53 | plainFlavors = new DataFlavor[3]; |
| 54 | plainFlavors[0] = new DataFlavor("text/plain;class=java.lang.String"); |
| 55 | plainFlavors[1] = new DataFlavor("text/plain;class=java.io.Reader"); |
| 56 | plainFlavors[2] = new DataFlavor("text/plain;charset=unicode;class=java.io.InputStream"); |
| 57 | |
| 58 | stringFlavors = new DataFlavor[2]; |
| 59 | stringFlavors[0] = new DataFlavor(DataFlavor.javaJVMLocalObjectMimeType+";class=java.lang.String"); |
| 60 | stringFlavors[1] = DataFlavor.stringFlavor; |
| 61 | |
| 62 | } catch (ClassNotFoundException cle) { |
| 63 | System.err.println("error initializing javax.swing.plaf.basic.BasicTranserable"); |
| 64 | } |
| 65 | } |
| 66 | |
| 67 | public BasicTransferable(String plainData, String htmlData) { |
| 68 | this.plainData = plainData; |
| 69 | this.htmlData = htmlData; |
| 70 | } |
| 71 | |
| 72 | |
| 73 | /** |
| 74 | * Returns an array of DataFlavor objects indicating the flavors the data |
| 75 | * can be provided in. The array should be ordered according to preference |
| 76 | * for providing the data (from most richly descriptive to least descriptive). |
| 77 | * @return an array of data flavors in which this data can be transferred |
| 78 | */ |
| 79 | public DataFlavor[] getTransferDataFlavors() { |
| 80 | DataFlavor[] richerFlavors = getRicherFlavors(); |
| 81 | int nRicher = (richerFlavors != null) ? richerFlavors.length : 0; |
| 82 | int nHTML = (isHTMLSupported()) ? htmlFlavors.length : 0; |
| 83 | int nPlain = (isPlainSupported()) ? plainFlavors.length: 0; |
| 84 | int nString = (isPlainSupported()) ? stringFlavors.length : 0; |
| 85 | int nFlavors = nRicher + nHTML + nPlain + nString; |
| 86 | DataFlavor[] flavors = new DataFlavor[nFlavors]; |
| 87 | |
| 88 | // fill in the array |
| 89 | int nDone = 0; |
| 90 | if (nRicher > 0) { |
| 91 | System.arraycopy(richerFlavors, 0, flavors, nDone, nRicher); |
| 92 | nDone += nRicher; |
| 93 | } |
| 94 | if (nHTML > 0) { |
| 95 | System.arraycopy(htmlFlavors, 0, flavors, nDone, nHTML); |
| 96 | nDone += nHTML; |
| 97 | } |
| 98 | if (nPlain > 0) { |
| 99 | System.arraycopy(plainFlavors, 0, flavors, nDone, nPlain); |
| 100 | nDone += nPlain; |
| 101 | } |
| 102 | if (nString > 0) { |
| 103 | System.arraycopy(stringFlavors, 0, flavors, nDone, nString); |
| 104 | nDone += nString; |
| 105 | } |
| 106 | return flavors; |
| 107 | } |
| 108 | |
| 109 | /** |
| 110 | * Returns whether or not the specified data flavor is supported for |
| 111 | * this object. |
| 112 | * @param flavor the requested flavor for the data |
| 113 | * @return boolean indicating whether or not the data flavor is supported |
| 114 | */ |
| 115 | public boolean isDataFlavorSupported(DataFlavor flavor) { |
| 116 | DataFlavor[] flavors = getTransferDataFlavors(); |
| 117 | for (int i = 0; i < flavors.length; i++) { |
| 118 | if (flavors[i].equals(flavor)) { |
| 119 | return true; |
| 120 | } |
| 121 | } |
| 122 | return false; |
| 123 | } |
| 124 | |
| 125 | /** |
| 126 | * Returns an object which represents the data to be transferred. The class |
| 127 | * of the object returned is defined by the representation class of the flavor. |
| 128 | * |
| 129 | * @param flavor the requested flavor for the data |
| 130 | * @see DataFlavor#getRepresentationClass |
| 131 | * @exception IOException if the data is no longer available |
| 132 | * in the requested flavor. |
| 133 | * @exception UnsupportedFlavorException if the requested data flavor is |
| 134 | * not supported. |
| 135 | */ |
| 136 | public Object getTransferData(DataFlavor flavor) throws UnsupportedFlavorException, IOException { |
| 137 | DataFlavor[] richerFlavors = getRicherFlavors(); |
| 138 | if (isRicherFlavor(flavor)) { |
| 139 | return getRicherData(flavor); |
| 140 | } else if (isHTMLFlavor(flavor)) { |
| 141 | String data = getHTMLData(); |
| 142 | data = (data == null) ? "" : data; |
| 143 | if (String.class.equals(flavor.getRepresentationClass())) { |
| 144 | return data; |
| 145 | } else if (Reader.class.equals(flavor.getRepresentationClass())) { |
| 146 | return new StringReader(data); |
| 147 | } else if (InputStream.class.equals(flavor.getRepresentationClass())) { |
| 148 | return new StringBufferInputStream(data); |
| 149 | } |
| 150 | // fall through to unsupported |
| 151 | } else if (isPlainFlavor(flavor)) { |
| 152 | String data = getPlainData(); |
| 153 | data = (data == null) ? "" : data; |
| 154 | if (String.class.equals(flavor.getRepresentationClass())) { |
| 155 | return data; |
| 156 | } else if (Reader.class.equals(flavor.getRepresentationClass())) { |
| 157 | return new StringReader(data); |
| 158 | } else if (InputStream.class.equals(flavor.getRepresentationClass())) { |
| 159 | return new StringBufferInputStream(data); |
| 160 | } |
| 161 | // fall through to unsupported |
| 162 | |
| 163 | } else if (isStringFlavor(flavor)) { |
| 164 | String data = getPlainData(); |
| 165 | data = (data == null) ? "" : data; |
| 166 | return data; |
| 167 | } |
| 168 | throw new UnsupportedFlavorException(flavor); |
| 169 | } |
| 170 | |
| 171 | // --- richer subclass flavors ---------------------------------------------- |
| 172 | |
| 173 | protected boolean isRicherFlavor(DataFlavor flavor) { |
| 174 | DataFlavor[] richerFlavors = getRicherFlavors(); |
| 175 | int nFlavors = (richerFlavors != null) ? richerFlavors.length : 0; |
| 176 | for (int i = 0; i < nFlavors; i++) { |
| 177 | if (richerFlavors[i].equals(flavor)) { |
| 178 | return true; |
| 179 | } |
| 180 | } |
| 181 | return false; |
| 182 | } |
| 183 | |
| 184 | /** |
| 185 | * Some subclasses will have flavors that are more descriptive than HTML |
| 186 | * or plain text. If this method returns a non-null value, it will be |
| 187 | * placed at the start of the array of supported flavors. |
| 188 | */ |
| 189 | protected DataFlavor[] getRicherFlavors() { |
| 190 | return null; |
| 191 | } |
| 192 | |
| 193 | protected Object getRicherData(DataFlavor flavor) throws UnsupportedFlavorException { |
| 194 | return null; |
| 195 | } |
| 196 | |
| 197 | // --- html flavors ---------------------------------------------------------- |
| 198 | |
| 199 | /** |
| 200 | * Returns whether or not the specified data flavor is an HTML flavor that |
| 201 | * is supported. |
| 202 | * @param flavor the requested flavor for the data |
| 203 | * @return boolean indicating whether or not the data flavor is supported |
| 204 | */ |
| 205 | protected boolean isHTMLFlavor(DataFlavor flavor) { |
| 206 | DataFlavor[] flavors = htmlFlavors; |
| 207 | for (int i = 0; i < flavors.length; i++) { |
| 208 | if (flavors[i].equals(flavor)) { |
| 209 | return true; |
| 210 | } |
| 211 | } |
| 212 | return false; |
| 213 | } |
| 214 | |
| 215 | /** |
| 216 | * Should the HTML flavors be offered? If so, the method |
| 217 | * getHTMLData should be implemented to provide something reasonable. |
| 218 | */ |
| 219 | protected boolean isHTMLSupported() { |
| 220 | return htmlData != null; |
| 221 | } |
| 222 | |
| 223 | /** |
| 224 | * Fetch the data in a text/html format |
| 225 | */ |
| 226 | protected String getHTMLData() { |
| 227 | return htmlData; |
| 228 | } |
| 229 | |
| 230 | // --- plain text flavors ---------------------------------------------------- |
| 231 | |
| 232 | /** |
| 233 | * Returns whether or not the specified data flavor is an plain flavor that |
| 234 | * is supported. |
| 235 | * @param flavor the requested flavor for the data |
| 236 | * @return boolean indicating whether or not the data flavor is supported |
| 237 | */ |
| 238 | protected boolean isPlainFlavor(DataFlavor flavor) { |
| 239 | DataFlavor[] flavors = plainFlavors; |
| 240 | for (int i = 0; i < flavors.length; i++) { |
| 241 | if (flavors[i].equals(flavor)) { |
| 242 | return true; |
| 243 | } |
| 244 | } |
| 245 | return false; |
| 246 | } |
| 247 | |
| 248 | /** |
| 249 | * Should the plain text flavors be offered? If so, the method |
| 250 | * getPlainData should be implemented to provide something reasonable. |
| 251 | */ |
| 252 | protected boolean isPlainSupported() { |
| 253 | return plainData != null; |
| 254 | } |
| 255 | |
| 256 | /** |
| 257 | * Fetch the data in a text/plain format. |
| 258 | */ |
| 259 | protected String getPlainData() { |
| 260 | return plainData; |
| 261 | } |
| 262 | |
| 263 | // --- string flavorss -------------------------------------------------------- |
| 264 | |
| 265 | /** |
| 266 | * Returns whether or not the specified data flavor is a String flavor that |
| 267 | * is supported. |
| 268 | * @param flavor the requested flavor for the data |
| 269 | * @return boolean indicating whether or not the data flavor is supported |
| 270 | */ |
| 271 | protected boolean isStringFlavor(DataFlavor flavor) { |
| 272 | DataFlavor[] flavors = stringFlavors; |
| 273 | for (int i = 0; i < flavors.length; i++) { |
| 274 | if (flavors[i].equals(flavor)) { |
| 275 | return true; |
| 276 | } |
| 277 | } |
| 278 | return false; |
| 279 | } |
| 280 | |
| 281 | |
| 282 | } |