J. Duke | 319a3b9 | 2007-12-01 00:00:00 +0000 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright 1997-2002 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 | |
| 26 | package java.awt.datatransfer; |
| 27 | |
| 28 | import java.io.Externalizable; |
| 29 | import java.io.ObjectOutput; |
| 30 | import java.io.ObjectInput; |
| 31 | import java.io.IOException; |
| 32 | import java.util.Enumeration; |
| 33 | |
| 34 | |
| 35 | /** |
| 36 | * A Multipurpose Internet Mail Extension (MIME) type, as defined |
| 37 | * in RFC 2045 and 2046. |
| 38 | * |
| 39 | * THIS IS *NOT* - REPEAT *NOT* - A PUBLIC CLASS! DataFlavor IS |
| 40 | * THE PUBLIC INTERFACE, AND THIS IS PROVIDED AS A ***PRIVATE*** |
| 41 | * (THAT IS AS IN *NOT* PUBLIC) HELPER CLASS! |
| 42 | */ |
| 43 | class MimeType implements Externalizable, Cloneable { |
| 44 | |
| 45 | /* |
| 46 | * serialization support |
| 47 | */ |
| 48 | |
| 49 | static final long serialVersionUID = -6568722458793895906L; |
| 50 | |
| 51 | /** |
| 52 | * Constructor for externalization; this constructor should not be |
| 53 | * called directly by an application, since the result will be an |
| 54 | * uninitialized, immutable <code>MimeType</code> object. |
| 55 | */ |
| 56 | public MimeType() { |
| 57 | } |
| 58 | |
| 59 | /** |
| 60 | * Builds a <code>MimeType</code> from a <code>String</code>. |
| 61 | * |
| 62 | * @param rawdata text used to initialize the <code>MimeType</code> |
| 63 | * @throws NullPointerException if <code>rawdata</code> is null |
| 64 | */ |
| 65 | public MimeType(String rawdata) throws MimeTypeParseException { |
| 66 | parse(rawdata); |
| 67 | } |
| 68 | |
| 69 | /** |
| 70 | * Builds a <code>MimeType</code> with the given primary and sub |
| 71 | * type but has an empty parameter list. |
| 72 | * |
| 73 | * @param primary the primary type of this <code>MimeType</code> |
| 74 | * @param sub the subtype of this <code>MimeType</code> |
| 75 | * @throws NullPointerException if either <code>primary</code> or |
| 76 | * <code>sub</code> is null |
| 77 | */ |
| 78 | public MimeType(String primary, String sub) throws MimeTypeParseException { |
| 79 | this(primary, sub, new MimeTypeParameterList()); |
| 80 | } |
| 81 | |
| 82 | /** |
| 83 | * Builds a <code>MimeType</code> with a pre-defined |
| 84 | * and valid (or empty) parameter list. |
| 85 | * |
| 86 | * @param primary the primary type of this <code>MimeType</code> |
| 87 | * @param sub the subtype of this <code>MimeType</code> |
| 88 | * @param mtpl the requested parameter list |
| 89 | * @throws NullPointerException if either <code>primary</code>, |
| 90 | * <code>sub</code> or <code>mtpl</code> is null |
| 91 | */ |
| 92 | public MimeType(String primary, String sub, MimeTypeParameterList mtpl) throws |
| 93 | MimeTypeParseException { |
| 94 | // check to see if primary is valid |
| 95 | if(isValidToken(primary)) { |
| 96 | primaryType = primary.toLowerCase(); |
| 97 | } else { |
| 98 | throw new MimeTypeParseException("Primary type is invalid."); |
| 99 | } |
| 100 | |
| 101 | // check to see if sub is valid |
| 102 | if(isValidToken(sub)) { |
| 103 | subType = sub.toLowerCase(); |
| 104 | } else { |
| 105 | throw new MimeTypeParseException("Sub type is invalid."); |
| 106 | } |
| 107 | |
| 108 | parameters = (MimeTypeParameterList)mtpl.clone(); |
| 109 | } |
| 110 | |
| 111 | public int hashCode() { |
| 112 | |
| 113 | // We sum up the hash codes for all of the strings. This |
| 114 | // way, the order of the strings is irrelevant |
| 115 | int code = 0; |
| 116 | code += primaryType.hashCode(); |
| 117 | code += subType.hashCode(); |
| 118 | code += parameters.hashCode(); |
| 119 | return code; |
| 120 | } // hashCode() |
| 121 | |
| 122 | /** |
| 123 | * <code>MimeType</code>s are equal if their primary types, |
| 124 | * subtypes, and parameters are all equal. No default values |
| 125 | * are taken into account. |
| 126 | * @param thatObject the object to be evaluated as a |
| 127 | * <code>MimeType</code> |
| 128 | * @return <code>true</code> if <code>thatObject</code> is |
| 129 | * a <code>MimeType</code>; otherwise returns <code>false</code> |
| 130 | */ |
| 131 | public boolean equals(Object thatObject) { |
| 132 | if (!(thatObject instanceof MimeType)) { |
| 133 | return false; |
| 134 | } |
| 135 | MimeType that = (MimeType)thatObject; |
| 136 | boolean isIt = |
| 137 | ((this.primaryType.equals(that.primaryType)) && |
| 138 | (this.subType.equals(that.subType)) && |
| 139 | (this.parameters.equals(that.parameters))); |
| 140 | return isIt; |
| 141 | } // equals() |
| 142 | |
| 143 | /** |
| 144 | * A routine for parsing the MIME type out of a String. |
| 145 | * |
| 146 | * @throws NullPointerException if <code>rawdata</code> is null |
| 147 | */ |
| 148 | private void parse(String rawdata) throws MimeTypeParseException { |
| 149 | int slashIndex = rawdata.indexOf('/'); |
| 150 | int semIndex = rawdata.indexOf(';'); |
| 151 | if((slashIndex < 0) && (semIndex < 0)) { |
| 152 | // neither character is present, so treat it |
| 153 | // as an error |
| 154 | throw new MimeTypeParseException("Unable to find a sub type."); |
| 155 | } else if((slashIndex < 0) && (semIndex >= 0)) { |
| 156 | // we have a ';' (and therefore a parameter list), |
| 157 | // but no '/' indicating a sub type is present |
| 158 | throw new MimeTypeParseException("Unable to find a sub type."); |
| 159 | } else if((slashIndex >= 0) && (semIndex < 0)) { |
| 160 | // we have a primary and sub type but no parameter list |
| 161 | primaryType = rawdata.substring(0, |
| 162 | slashIndex).trim().toLowerCase(); |
| 163 | subType = rawdata.substring(slashIndex + |
| 164 | 1).trim().toLowerCase(); |
| 165 | parameters = new MimeTypeParameterList(); |
| 166 | } else if (slashIndex < semIndex) { |
| 167 | // we have all three items in the proper sequence |
| 168 | primaryType = rawdata.substring(0, |
| 169 | slashIndex).trim().toLowerCase(); |
| 170 | subType = rawdata.substring(slashIndex + 1, |
| 171 | semIndex).trim().toLowerCase(); |
| 172 | parameters = new |
| 173 | MimeTypeParameterList(rawdata.substring(semIndex)); |
| 174 | } else { |
| 175 | // we have a ';' lexically before a '/' which means we have a primary type |
| 176 | // & a parameter list but no sub type |
| 177 | throw new MimeTypeParseException("Unable to find a sub type."); |
| 178 | } |
| 179 | |
| 180 | // now validate the primary and sub types |
| 181 | |
| 182 | // check to see if primary is valid |
| 183 | if(!isValidToken(primaryType)) { |
| 184 | throw new MimeTypeParseException("Primary type is invalid."); |
| 185 | } |
| 186 | |
| 187 | // check to see if sub is valid |
| 188 | if(!isValidToken(subType)) { |
| 189 | throw new MimeTypeParseException("Sub type is invalid."); |
| 190 | } |
| 191 | } |
| 192 | |
| 193 | /** |
| 194 | * Retrieve the primary type of this object. |
| 195 | */ |
| 196 | public String getPrimaryType() { |
| 197 | return primaryType; |
| 198 | } |
| 199 | |
| 200 | /** |
| 201 | * Retrieve the sub type of this object. |
| 202 | */ |
| 203 | public String getSubType() { |
| 204 | return subType; |
| 205 | } |
| 206 | |
| 207 | /** |
| 208 | * Retrieve a copy of this object's parameter list. |
| 209 | */ |
| 210 | public MimeTypeParameterList getParameters() { |
| 211 | return (MimeTypeParameterList)parameters.clone(); |
| 212 | } |
| 213 | |
| 214 | /** |
| 215 | * Retrieve the value associated with the given name, or null if there |
| 216 | * is no current association. |
| 217 | */ |
| 218 | public String getParameter(String name) { |
| 219 | return parameters.get(name); |
| 220 | } |
| 221 | |
| 222 | /** |
| 223 | * Set the value to be associated with the given name, replacing |
| 224 | * any previous association. |
| 225 | * |
| 226 | * @throw IllegalArgumentException if parameter or value is illegal |
| 227 | */ |
| 228 | public void setParameter(String name, String value) { |
| 229 | parameters.set(name, value); |
| 230 | } |
| 231 | |
| 232 | /** |
| 233 | * Remove any value associated with the given name. |
| 234 | * |
| 235 | * @throw IllegalArgumentExcpetion if parameter may not be deleted |
| 236 | */ |
| 237 | public void removeParameter(String name) { |
| 238 | parameters.remove(name); |
| 239 | } |
| 240 | |
| 241 | /** |
| 242 | * Return the String representation of this object. |
| 243 | */ |
| 244 | public String toString() { |
| 245 | return getBaseType() + parameters.toString(); |
| 246 | } |
| 247 | |
| 248 | /** |
| 249 | * Return a String representation of this object |
| 250 | * without the parameter list. |
| 251 | */ |
| 252 | public String getBaseType() { |
| 253 | return primaryType + "/" + subType; |
| 254 | } |
| 255 | |
| 256 | /** |
| 257 | * Returns <code>true</code> if the primary type and the |
| 258 | * subtype of this object are the same as the specified |
| 259 | * <code>type</code>; otherwise returns <code>false</code>. |
| 260 | * |
| 261 | * @param type the type to compare to <code>this</code>'s type |
| 262 | * @return <code>true</code> if the primary type and the |
| 263 | * subtype of this object are the same as the |
| 264 | * specified <code>type</code>; otherwise returns |
| 265 | * <code>false</code> |
| 266 | */ |
| 267 | public boolean match(MimeType type) { |
| 268 | if (type == null) |
| 269 | return false; |
| 270 | return primaryType.equals(type.getPrimaryType()) |
| 271 | && (subType.equals("*") |
| 272 | || type.getSubType().equals("*") |
| 273 | || (subType.equals(type.getSubType()))); |
| 274 | } |
| 275 | |
| 276 | /** |
| 277 | * Returns <code>true</code> if the primary type and the |
| 278 | * subtype of this object are the same as the content type |
| 279 | * described in <code>rawdata</code>; otherwise returns |
| 280 | * <code>false</code>. |
| 281 | * |
| 282 | * @param rawdata the raw data to be examined |
| 283 | * @return <code>true</code> if the primary type and the |
| 284 | * subtype of this object are the same as the content type |
| 285 | * described in <code>rawdata</code>; otherwise returns |
| 286 | * <code>false</code>; if <code>rawdata</code> is |
| 287 | * <code>null</code>, returns <code>false</code> |
| 288 | */ |
| 289 | public boolean match(String rawdata) throws MimeTypeParseException { |
| 290 | if (rawdata == null) |
| 291 | return false; |
| 292 | return match(new MimeType(rawdata)); |
| 293 | } |
| 294 | |
| 295 | /** |
| 296 | * The object implements the writeExternal method to save its contents |
| 297 | * by calling the methods of DataOutput for its primitive values or |
| 298 | * calling the writeObject method of ObjectOutput for objects, strings |
| 299 | * and arrays. |
| 300 | * @exception IOException Includes any I/O exceptions that may occur |
| 301 | */ |
| 302 | public void writeExternal(ObjectOutput out) throws IOException { |
| 303 | String s = toString(); // contains ASCII chars only |
| 304 | // one-to-one correspondence between ASCII char and byte in UTF string |
| 305 | if (s.length() <= 65535) { // 65535 is max length of UTF string |
| 306 | out.writeUTF(s); |
| 307 | } else { |
| 308 | out.writeByte(0); |
| 309 | out.writeByte(0); |
| 310 | out.writeInt(s.length()); |
| 311 | out.write(s.getBytes()); |
| 312 | } |
| 313 | } |
| 314 | |
| 315 | /** |
| 316 | * The object implements the readExternal method to restore its |
| 317 | * contents by calling the methods of DataInput for primitive |
| 318 | * types and readObject for objects, strings and arrays. The |
| 319 | * readExternal method must read the values in the same sequence |
| 320 | * and with the same types as were written by writeExternal. |
| 321 | * @exception ClassNotFoundException If the class for an object being |
| 322 | * restored cannot be found. |
| 323 | */ |
| 324 | public void readExternal(ObjectInput in) throws IOException, |
| 325 | ClassNotFoundException { |
| 326 | String s = in.readUTF(); |
| 327 | if (s == null || s.length() == 0) { // long mime type |
| 328 | byte[] ba = new byte[in.readInt()]; |
| 329 | in.readFully(ba); |
| 330 | s = new String(ba); |
| 331 | } |
| 332 | try { |
| 333 | parse(s); |
| 334 | } catch(MimeTypeParseException e) { |
| 335 | throw new IOException(e.toString()); |
| 336 | } |
| 337 | } |
| 338 | |
| 339 | /** |
| 340 | * Returns a clone of this object. |
| 341 | * @return a clone of this object |
| 342 | */ |
| 343 | |
| 344 | public Object clone() { |
| 345 | MimeType newObj = null; |
| 346 | try { |
| 347 | newObj = (MimeType)super.clone(); |
| 348 | } catch (CloneNotSupportedException cannotHappen) { |
| 349 | } |
| 350 | newObj.parameters = (MimeTypeParameterList)parameters.clone(); |
| 351 | return newObj; |
| 352 | } |
| 353 | |
| 354 | private String primaryType; |
| 355 | private String subType; |
| 356 | private MimeTypeParameterList parameters; |
| 357 | |
| 358 | // below here be scary parsing related things |
| 359 | |
| 360 | /** |
| 361 | * Determines whether or not a given character belongs to a legal token. |
| 362 | */ |
| 363 | private static boolean isTokenChar(char c) { |
| 364 | return ((c > 040) && (c < 0177)) && (TSPECIALS.indexOf(c) < 0); |
| 365 | } |
| 366 | |
| 367 | /** |
| 368 | * Determines whether or not a given string is a legal token. |
| 369 | * |
| 370 | * @throws NullPointerException if <code>s</code> is null |
| 371 | */ |
| 372 | private boolean isValidToken(String s) { |
| 373 | int len = s.length(); |
| 374 | if(len > 0) { |
| 375 | for (int i = 0; i < len; ++i) { |
| 376 | char c = s.charAt(i); |
| 377 | if (!isTokenChar(c)) { |
| 378 | return false; |
| 379 | } |
| 380 | } |
| 381 | return true; |
| 382 | } else { |
| 383 | return false; |
| 384 | } |
| 385 | } |
| 386 | |
| 387 | /** |
| 388 | * A string that holds all the special chars. |
| 389 | */ |
| 390 | |
| 391 | private static final String TSPECIALS = "()<>@,;:\\\"/[]?="; |
| 392 | |
| 393 | } // class MimeType |