J. Duke | 319a3b9 | 2007-12-01 00:00:00 +0000 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright 2000-2006 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 java.beans; |
| 26 | |
| 27 | import java.io.*; |
| 28 | import java.util.*; |
| 29 | import java.lang.reflect.*; |
| 30 | import java.nio.charset.Charset; |
| 31 | import java.nio.charset.CharsetEncoder; |
| 32 | import java.nio.charset.IllegalCharsetNameException; |
| 33 | import java.nio.charset.UnsupportedCharsetException; |
| 34 | |
| 35 | /** |
| 36 | * The <code>XMLEncoder</code> class is a complementary alternative to |
| 37 | * the <code>ObjectOutputStream</code> and can used to generate |
| 38 | * a textual representation of a <em>JavaBean</em> in the same |
| 39 | * way that the <code>ObjectOutputStream</code> can |
| 40 | * be used to create binary representation of <code>Serializable</code> |
| 41 | * objects. For example, the following fragment can be used to create |
| 42 | * a textual representation the supplied <em>JavaBean</em> |
| 43 | * and all its properties: |
| 44 | * <pre> |
| 45 | * XMLEncoder e = new XMLEncoder( |
| 46 | * new BufferedOutputStream( |
| 47 | * new FileOutputStream("Test.xml"))); |
| 48 | * e.writeObject(new JButton("Hello, world")); |
| 49 | * e.close(); |
| 50 | * </pre> |
| 51 | * Despite the similarity of their APIs, the <code>XMLEncoder</code> |
| 52 | * class is exclusively designed for the purpose of archiving graphs |
| 53 | * of <em>JavaBean</em>s as textual representations of their public |
| 54 | * properties. Like Java source files, documents written this way |
| 55 | * have a natural immunity to changes in the implementations of the classes |
| 56 | * involved. The <code>ObjectOutputStream</code> continues to be recommended |
| 57 | * for interprocess communication and general purpose serialization. |
| 58 | * <p> |
| 59 | * The <code>XMLEncoder</code> class provides a default denotation for |
| 60 | * <em>JavaBean</em>s in which they are represented as XML documents |
| 61 | * complying with version 1.0 of the XML specification and the |
| 62 | * UTF-8 character encoding of the Unicode/ISO 10646 character set. |
| 63 | * The XML documents produced by the <code>XMLEncoder</code> class are: |
| 64 | * <ul> |
| 65 | * <li> |
| 66 | * <em>Portable and version resilient</em>: they have no dependencies |
| 67 | * on the private implementation of any class and so, like Java source |
| 68 | * files, they may be exchanged between environments which may have |
| 69 | * different versions of some of the classes and between VMs from |
| 70 | * different vendors. |
| 71 | * <li> |
| 72 | * <em>Structurally compact</em>: The <code>XMLEncoder</code> class |
| 73 | * uses a <em>redundancy elimination</em> algorithm internally so that the |
| 74 | * default values of a Bean's properties are not written to the stream. |
| 75 | * <li> |
| 76 | * <em>Fault tolerant</em>: Non-structural errors in the file, |
| 77 | * caused either by damage to the file or by API changes |
| 78 | * made to classes in an archive remain localized |
| 79 | * so that a reader can report the error and continue to load the parts |
| 80 | * of the document which were not affected by the error. |
| 81 | * </ul> |
| 82 | * <p> |
| 83 | * Below is an example of an XML archive containing |
| 84 | * some user interface components from the <em>swing</em> toolkit: |
| 85 | * <pre> |
| 86 | * <?xml version="1.0" encoding="UTF-8"?> |
| 87 | * <java version="1.0" class="java.beans.XMLDecoder"> |
| 88 | * <object class="javax.swing.JFrame"> |
| 89 | * <void property="name"> |
| 90 | * <string>frame1</string> |
| 91 | * </void> |
| 92 | * <void property="bounds"> |
| 93 | * <object class="java.awt.Rectangle"> |
| 94 | * <int>0</int> |
| 95 | * <int>0</int> |
| 96 | * <int>200</int> |
| 97 | * <int>200</int> |
| 98 | * </object> |
| 99 | * </void> |
| 100 | * <void property="contentPane"> |
| 101 | * <void method="add"> |
| 102 | * <object class="javax.swing.JButton"> |
| 103 | * <void property="label"> |
| 104 | * <string>Hello</string> |
| 105 | * </void> |
| 106 | * </object> |
| 107 | * </void> |
| 108 | * </void> |
| 109 | * <void property="visible"> |
| 110 | * <boolean>true</boolean> |
| 111 | * </void> |
| 112 | * </object> |
| 113 | * </java> |
| 114 | * </pre> |
| 115 | * The XML syntax uses the following conventions: |
| 116 | * <ul> |
| 117 | * <li> |
| 118 | * Each element represents a method call. |
| 119 | * <li> |
| 120 | * The "object" tag denotes an <em>expression</em> whose value is |
| 121 | * to be used as the argument to the enclosing element. |
| 122 | * <li> |
| 123 | * The "void" tag denotes a <em>statement</em> which will |
| 124 | * be executed, but whose result will not be used as an |
| 125 | * argument to the enclosing method. |
| 126 | * <li> |
| 127 | * Elements which contain elements use those elements as arguments, |
| 128 | * unless they have the tag: "void". |
| 129 | * <li> |
| 130 | * The name of the method is denoted by the "method" attribute. |
| 131 | * <li> |
| 132 | * XML's standard "id" and "idref" attributes are used to make |
| 133 | * references to previous expressions - so as to deal with |
| 134 | * circularities in the object graph. |
| 135 | * <li> |
| 136 | * The "class" attribute is used to specify the target of a static |
| 137 | * method or constructor explicitly; its value being the fully |
| 138 | * qualified name of the class. |
| 139 | * <li> |
| 140 | * Elements with the "void" tag are executed using |
| 141 | * the outer context as the target if no target is defined |
| 142 | * by a "class" attribute. |
| 143 | * <li> |
| 144 | * Java's String class is treated specially and is |
| 145 | * written <string>Hello, world</string> where |
| 146 | * the characters of the string are converted to bytes |
| 147 | * using the UTF-8 character encoding. |
| 148 | * </ul> |
| 149 | * <p> |
| 150 | * Although all object graphs may be written using just these three |
| 151 | * tags, the following definitions are included so that common |
| 152 | * data structures can be expressed more concisely: |
| 153 | * <p> |
| 154 | * <ul> |
| 155 | * <li> |
| 156 | * The default method name is "new". |
| 157 | * <li> |
| 158 | * A reference to a java class is written in the form |
| 159 | * <class>javax.swing.JButton</class>. |
| 160 | * <li> |
| 161 | * Instances of the wrapper classes for Java's primitive types are written |
| 162 | * using the name of the primitive type as the tag. For example, an |
| 163 | * instance of the <code>Integer</code> class could be written: |
| 164 | * <int>123</int>. Note that the <code>XMLEncoder</code> class |
| 165 | * uses Java's reflection package in which the conversion between |
| 166 | * Java's primitive types and their associated "wrapper classes" |
| 167 | * is handled internally. The API for the <code>XMLEncoder</code> class |
| 168 | * itself deals only with <code>Object</code>s. |
| 169 | * <li> |
| 170 | * In an element representing a nullary method whose name |
| 171 | * starts with "get", the "method" attribute is replaced |
| 172 | * with a "property" attribute whose value is given by removing |
| 173 | * the "get" prefix and decapitalizing the result. |
| 174 | * <li> |
| 175 | * In an element representing a monadic method whose name |
| 176 | * starts with "set", the "method" attribute is replaced |
| 177 | * with a "property" attribute whose value is given by removing |
| 178 | * the "set" prefix and decapitalizing the result. |
| 179 | * <li> |
| 180 | * In an element representing a method named "get" taking one |
| 181 | * integer argument, the "method" attribute is replaced |
| 182 | * with an "index" attribute whose value the value of the |
| 183 | * first argument. |
| 184 | * <li> |
| 185 | * In an element representing a method named "set" taking two arguments, |
| 186 | * the first of which is an integer, the "method" attribute is replaced |
| 187 | * with an "index" attribute whose value the value of the |
| 188 | * first argument. |
| 189 | * <li> |
| 190 | * A reference to an array is written using the "array" |
| 191 | * tag. The "class" and "length" attributes specify the |
| 192 | * sub-type of the array and its length respectively. |
| 193 | * </ul> |
| 194 | * |
| 195 | *<p> |
| 196 | * For more information you might also want to check out |
| 197 | * <a |
| 198 | href="http://java.sun.com/products/jfc/tsc/articles/persistence4">Using XMLEncoder</a>, |
| 199 | * an article in <em>The Swing Connection.</em> |
| 200 | * @see XMLDecoder |
| 201 | * @see java.io.ObjectOutputStream |
| 202 | * |
| 203 | * @since 1.4 |
| 204 | * |
| 205 | * @author Philip Milne |
| 206 | */ |
| 207 | public class XMLEncoder extends Encoder { |
| 208 | |
| 209 | private final CharsetEncoder encoder; |
| 210 | private final String charset; |
| 211 | private final boolean declaration; |
| 212 | |
| 213 | private OutputStreamWriter out; |
| 214 | private Object owner; |
| 215 | private int indentation = 0; |
| 216 | private boolean internal = false; |
| 217 | private Map valueToExpression; |
| 218 | private Map targetToStatementList; |
| 219 | private boolean preambleWritten = false; |
| 220 | private NameGenerator nameGenerator; |
| 221 | |
| 222 | private class ValueData { |
| 223 | public int refs = 0; |
| 224 | public boolean marked = false; // Marked -> refs > 0 unless ref was a target. |
| 225 | public String name = null; |
| 226 | public Expression exp = null; |
| 227 | } |
| 228 | |
| 229 | /** |
| 230 | * Creates a new XML encoder to write out <em>JavaBeans</em> |
| 231 | * to the stream <code>out</code> using an XML encoding. |
| 232 | * |
| 233 | * @param out the stream to which the XML representation of |
| 234 | * the objects will be written |
| 235 | * |
| 236 | * @throws IllegalArgumentException |
| 237 | * if <code>out</code> is <code>null</code> |
| 238 | * |
| 239 | * @see XMLDecoder#XMLDecoder(InputStream) |
| 240 | */ |
| 241 | public XMLEncoder(OutputStream out) { |
| 242 | this(out, "UTF-8", true, 0); |
| 243 | } |
| 244 | |
| 245 | /** |
| 246 | * Creates a new XML encoder to write out <em>JavaBeans</em> |
| 247 | * to the stream <code>out</code> using the given <code>charset</code> |
| 248 | * starting from the given <code>indentation</code>. |
| 249 | * |
| 250 | * @param out the stream to which the XML representation of |
| 251 | * the objects will be written |
| 252 | * @param charset the name of the requested charset; |
| 253 | * may be either a canonical name or an alias |
| 254 | * @param declaration whether the XML declaration should be generated; |
| 255 | * set this to <code>false</code> |
| 256 | * when embedding the contents in another XML document |
| 257 | * @param indentation the number of space characters to indent the entire XML document by |
| 258 | * |
| 259 | * @throws IllegalArgumentException |
| 260 | * if <code>out</code> or <code>charset</code> is <code>null</code>, |
| 261 | * or if <code>indentation</code> is less than 0 |
| 262 | * |
| 263 | * @throws IllegalCharsetNameException |
| 264 | * if <code>charset</code> name is illegal |
| 265 | * |
| 266 | * @throws UnsupportedCharsetException |
| 267 | * if no support for the named charset is available |
| 268 | * in this instance of the Java virtual machine |
| 269 | * |
| 270 | * @throws UnsupportedOperationException |
| 271 | * if loaded charset does not support encoding |
| 272 | * |
| 273 | * @see Charset#forName(String) |
| 274 | * |
| 275 | * @since 1.7 |
| 276 | */ |
| 277 | public XMLEncoder(OutputStream out, String charset, boolean declaration, int indentation) { |
| 278 | if (out == null) { |
| 279 | throw new IllegalArgumentException("the output stream cannot be null"); |
| 280 | } |
| 281 | if (indentation < 0) { |
| 282 | throw new IllegalArgumentException("the indentation must be >= 0"); |
| 283 | } |
| 284 | Charset cs = Charset.forName(charset); |
| 285 | this.encoder = cs.newEncoder(); |
| 286 | this.charset = charset; |
| 287 | this.declaration = declaration; |
| 288 | this.indentation = indentation; |
| 289 | this.out = new OutputStreamWriter(out, cs.newEncoder()); |
| 290 | valueToExpression = new IdentityHashMap(); |
| 291 | targetToStatementList = new IdentityHashMap(); |
| 292 | nameGenerator = new NameGenerator(); |
| 293 | } |
| 294 | |
| 295 | /** |
| 296 | * Sets the owner of this encoder to <code>owner</code>. |
| 297 | * |
| 298 | * @param owner The owner of this encoder. |
| 299 | * |
| 300 | * @see #getOwner |
| 301 | */ |
| 302 | public void setOwner(Object owner) { |
| 303 | this.owner = owner; |
| 304 | writeExpression(new Expression(this, "getOwner", new Object[0])); |
| 305 | } |
| 306 | |
| 307 | /** |
| 308 | * Gets the owner of this encoder. |
| 309 | * |
| 310 | * @return The owner of this encoder. |
| 311 | * |
| 312 | * @see #setOwner |
| 313 | */ |
| 314 | public Object getOwner() { |
| 315 | return owner; |
| 316 | } |
| 317 | |
| 318 | /** |
| 319 | * Write an XML representation of the specified object to the output. |
| 320 | * |
| 321 | * @param o The object to be written to the stream. |
| 322 | * |
| 323 | * @see XMLDecoder#readObject |
| 324 | */ |
| 325 | public void writeObject(Object o) { |
| 326 | if (internal) { |
| 327 | super.writeObject(o); |
| 328 | } |
| 329 | else { |
| 330 | writeStatement(new Statement(this, "writeObject", new Object[]{o})); |
| 331 | } |
| 332 | } |
| 333 | |
| 334 | private Vector statementList(Object target) { |
| 335 | Vector list = (Vector)targetToStatementList.get(target); |
| 336 | if (list != null) { |
| 337 | return list; |
| 338 | } |
| 339 | list = new Vector(); |
| 340 | targetToStatementList.put(target, list); |
| 341 | return list; |
| 342 | } |
| 343 | |
| 344 | |
| 345 | private void mark(Object o, boolean isArgument) { |
| 346 | if (o == null || o == this) { |
| 347 | return; |
| 348 | } |
| 349 | ValueData d = getValueData(o); |
| 350 | Expression exp = d.exp; |
| 351 | // Do not mark liternal strings. Other strings, which might, |
| 352 | // for example, come from resource bundles should still be marked. |
| 353 | if (o.getClass() == String.class && exp == null) { |
| 354 | return; |
| 355 | } |
| 356 | |
| 357 | // Bump the reference counts of all arguments |
| 358 | if (isArgument) { |
| 359 | d.refs++; |
| 360 | } |
| 361 | if (d.marked) { |
| 362 | return; |
| 363 | } |
| 364 | d.marked = true; |
| 365 | Object target = exp.getTarget(); |
| 366 | if (!(target instanceof Class)) { |
| 367 | statementList(target).add(exp); |
| 368 | // Pending: Why does the reference count need to |
| 369 | // be incremented here? |
| 370 | d.refs++; |
| 371 | } |
| 372 | mark(exp); |
| 373 | } |
| 374 | |
| 375 | private void mark(Statement stm) { |
| 376 | Object[] args = stm.getArguments(); |
| 377 | for (int i = 0; i < args.length; i++) { |
| 378 | Object arg = args[i]; |
| 379 | mark(arg, true); |
| 380 | } |
| 381 | mark(stm.getTarget(), false); |
| 382 | } |
| 383 | |
| 384 | |
| 385 | /** |
| 386 | * Records the Statement so that the Encoder will |
| 387 | * produce the actual output when the stream is flushed. |
| 388 | * <P> |
| 389 | * This method should only be invoked within the context |
| 390 | * of initializing a persistence delegate. |
| 391 | * |
| 392 | * @param oldStm The statement that will be written |
| 393 | * to the stream. |
| 394 | * @see java.beans.PersistenceDelegate#initialize |
| 395 | */ |
| 396 | public void writeStatement(Statement oldStm) { |
| 397 | // System.out.println("XMLEncoder::writeStatement: " + oldStm); |
| 398 | boolean internal = this.internal; |
| 399 | this.internal = true; |
| 400 | try { |
| 401 | super.writeStatement(oldStm); |
| 402 | /* |
| 403 | Note we must do the mark first as we may |
| 404 | require the results of previous values in |
| 405 | this context for this statement. |
| 406 | Test case is: |
| 407 | os.setOwner(this); |
| 408 | os.writeObject(this); |
| 409 | */ |
| 410 | mark(oldStm); |
| 411 | statementList(oldStm.getTarget()).add(oldStm); |
| 412 | } |
| 413 | catch (Exception e) { |
| 414 | getExceptionListener().exceptionThrown(new Exception("XMLEncoder: discarding statement " + oldStm, e)); |
| 415 | } |
| 416 | this.internal = internal; |
| 417 | } |
| 418 | |
| 419 | |
| 420 | /** |
| 421 | * Records the Expression so that the Encoder will |
| 422 | * produce the actual output when the stream is flushed. |
| 423 | * <P> |
| 424 | * This method should only be invoked within the context of |
| 425 | * initializing a persistence delegate or setting up an encoder to |
| 426 | * read from a resource bundle. |
| 427 | * <P> |
| 428 | * For more information about using resource bundles with the |
| 429 | * XMLEncoder, see |
| 430 | * http://java.sun.com/products/jfc/tsc/articles/persistence4/#i18n |
| 431 | * |
| 432 | * @param oldExp The expression that will be written |
| 433 | * to the stream. |
| 434 | * @see java.beans.PersistenceDelegate#initialize |
| 435 | */ |
| 436 | public void writeExpression(Expression oldExp) { |
| 437 | boolean internal = this.internal; |
| 438 | this.internal = true; |
| 439 | Object oldValue = getValue(oldExp); |
| 440 | if (get(oldValue) == null || (oldValue instanceof String && !internal)) { |
| 441 | getValueData(oldValue).exp = oldExp; |
| 442 | super.writeExpression(oldExp); |
| 443 | } |
| 444 | this.internal = internal; |
| 445 | } |
| 446 | |
| 447 | /** |
| 448 | * This method writes out the preamble associated with the |
| 449 | * XML encoding if it has not been written already and |
| 450 | * then writes out all of the values that been |
| 451 | * written to the stream since the last time <code>flush</code> |
| 452 | * was called. After flushing, all internal references to the |
| 453 | * values that were written to this stream are cleared. |
| 454 | */ |
| 455 | public void flush() { |
| 456 | if (!preambleWritten) { // Don't do this in constructor - it throws ... pending. |
| 457 | if (this.declaration) { |
| 458 | writeln("<?xml version=" + quote("1.0") + |
| 459 | " encoding=" + quote(this.charset) + "?>"); |
| 460 | } |
| 461 | writeln("<java version=" + quote(System.getProperty("java.version")) + |
| 462 | " class=" + quote(XMLDecoder.class.getName()) + ">"); |
| 463 | preambleWritten = true; |
| 464 | } |
| 465 | indentation++; |
| 466 | Vector roots = statementList(this); |
| 467 | for(int i = 0; i < roots.size(); i++) { |
| 468 | Statement s = (Statement)roots.get(i); |
| 469 | if ("writeObject".equals(s.getMethodName())) { |
| 470 | outputValue(s.getArguments()[0], this, true); |
| 471 | } |
| 472 | else { |
| 473 | outputStatement(s, this, false); |
| 474 | } |
| 475 | } |
| 476 | indentation--; |
| 477 | |
| 478 | try { |
| 479 | out.flush(); |
| 480 | } |
| 481 | catch (IOException e) { |
| 482 | getExceptionListener().exceptionThrown(e); |
| 483 | } |
| 484 | clear(); |
| 485 | } |
| 486 | |
| 487 | void clear() { |
| 488 | super.clear(); |
| 489 | nameGenerator.clear(); |
| 490 | valueToExpression.clear(); |
| 491 | targetToStatementList.clear(); |
| 492 | } |
| 493 | |
| 494 | |
| 495 | /** |
| 496 | * This method calls <code>flush</code>, writes the closing |
| 497 | * postamble and then closes the output stream associated |
| 498 | * with this stream. |
| 499 | */ |
| 500 | public void close() { |
| 501 | flush(); |
| 502 | writeln("</java>"); |
| 503 | try { |
| 504 | out.close(); |
| 505 | } |
| 506 | catch (IOException e) { |
| 507 | getExceptionListener().exceptionThrown(e); |
| 508 | } |
| 509 | } |
| 510 | |
| 511 | private String quote(String s) { |
| 512 | return "\"" + s + "\""; |
| 513 | } |
| 514 | |
| 515 | private ValueData getValueData(Object o) { |
| 516 | ValueData d = (ValueData)valueToExpression.get(o); |
| 517 | if (d == null) { |
| 518 | d = new ValueData(); |
| 519 | valueToExpression.put(o, d); |
| 520 | } |
| 521 | return d; |
| 522 | } |
| 523 | |
| 524 | /** |
| 525 | * Returns <code>true</code> if the argument, |
| 526 | * a Unicode code point, is valid in XML documents. |
| 527 | * Unicode characters fit into the low sixteen bits of a Unicode code point, |
| 528 | * and pairs of Unicode <em>surrogate characters</em> can be combined |
| 529 | * to encode Unicode code point in documents containing only Unicode. |
| 530 | * (The <code>char</code> datatype in the Java Programming Language |
| 531 | * represents Unicode characters, including unpaired surrogates.) |
| 532 | * <par> |
| 533 | * [2] Char ::= #x0009 | #x000A | #x000D |
| 534 | * | [#x0020-#xD7FF] |
| 535 | * | [#xE000-#xFFFD] |
| 536 | * | [#x10000-#x10ffff] |
| 537 | * </par> |
| 538 | * |
| 539 | * @param code the 32-bit Unicode code point being tested |
| 540 | * @return <code>true</code> if the Unicode code point is valid, |
| 541 | * <code>false</code> otherwise |
| 542 | */ |
| 543 | private static boolean isValidCharCode(int code) { |
| 544 | return (0x0020 <= code && code <= 0xD7FF) |
| 545 | || (0x000A == code) |
| 546 | || (0x0009 == code) |
| 547 | || (0x000D == code) |
| 548 | || (0xE000 <= code && code <= 0xFFFD) |
| 549 | || (0x10000 <= code && code <= 0x10ffff); |
| 550 | } |
| 551 | |
| 552 | private void writeln(String exp) { |
| 553 | try { |
| 554 | StringBuilder sb = new StringBuilder(); |
| 555 | for(int i = 0; i < indentation; i++) { |
| 556 | sb.append(' '); |
| 557 | } |
| 558 | sb.append(exp); |
| 559 | sb.append('\n'); |
| 560 | this.out.write(sb.toString()); |
| 561 | } |
| 562 | catch (IOException e) { |
| 563 | getExceptionListener().exceptionThrown(e); |
| 564 | } |
| 565 | } |
| 566 | |
| 567 | private void outputValue(Object value, Object outer, boolean isArgument) { |
| 568 | if (value == null) { |
| 569 | writeln("<null/>"); |
| 570 | return; |
| 571 | } |
| 572 | |
| 573 | if (value instanceof Class) { |
| 574 | writeln("<class>" + ((Class)value).getName() + "</class>"); |
| 575 | return; |
| 576 | } |
| 577 | |
| 578 | ValueData d = getValueData(value); |
| 579 | if (d.exp != null) { |
| 580 | Object target = d.exp.getTarget(); |
| 581 | String methodName = d.exp.getMethodName(); |
| 582 | |
| 583 | if (target == null || methodName == null) { |
| 584 | throw new NullPointerException((target == null ? "target" : |
| 585 | "methodName") + " should not be null"); |
| 586 | } |
| 587 | |
| 588 | if (target instanceof Field && methodName.equals("get")) { |
| 589 | Field f = (Field)target; |
| 590 | writeln("<object class=" + quote(f.getDeclaringClass().getName()) + |
| 591 | " field=" + quote(f.getName()) + "/>"); |
| 592 | return; |
| 593 | } |
| 594 | |
| 595 | Class primitiveType = ReflectionUtils.primitiveTypeFor(value.getClass()); |
| 596 | if (primitiveType != null && target == value.getClass() && |
| 597 | methodName.equals("new")) { |
| 598 | String primitiveTypeName = primitiveType.getName(); |
| 599 | // Make sure that character types are quoted correctly. |
| 600 | if (primitiveType == Character.TYPE) { |
| 601 | char code = ((Character) value).charValue(); |
| 602 | if (!isValidCharCode(code)) { |
| 603 | writeln(createString(code)); |
| 604 | return; |
| 605 | } |
| 606 | value = quoteCharCode(code); |
| 607 | if (value == null) { |
| 608 | value = Character.valueOf(code); |
| 609 | } |
| 610 | } |
| 611 | writeln("<" + primitiveTypeName + ">" + value + "</" + |
| 612 | primitiveTypeName + ">"); |
| 613 | return; |
| 614 | } |
| 615 | |
| 616 | } else if (value instanceof String) { |
| 617 | writeln(createString((String) value)); |
| 618 | return; |
| 619 | } |
| 620 | |
| 621 | if (d.name != null) { |
| 622 | writeln("<object idref=" + quote(d.name) + "/>"); |
| 623 | return; |
| 624 | } |
| 625 | |
| 626 | outputStatement(d.exp, outer, isArgument); |
| 627 | } |
| 628 | |
| 629 | private static String quoteCharCode(int code) { |
| 630 | switch(code) { |
| 631 | case '&': return "&"; |
| 632 | case '<': return "<"; |
| 633 | case '>': return ">"; |
| 634 | case '"': return """; |
| 635 | case '\'': return "'"; |
| 636 | case '\r': return " "; |
| 637 | default: return null; |
| 638 | } |
| 639 | } |
| 640 | |
| 641 | private static String createString(int code) { |
| 642 | return "<char code=\"#" + Integer.toString(code, 16) + "\"/>"; |
| 643 | } |
| 644 | |
| 645 | private String createString(String string) { |
| 646 | StringBuilder sb = new StringBuilder(); |
| 647 | sb.append("<string>"); |
| 648 | int index = 0; |
| 649 | while (index < string.length()) { |
| 650 | int point = string.codePointAt(index); |
| 651 | int count = Character.charCount(point); |
| 652 | |
| 653 | if (isValidCharCode(point) && this.encoder.canEncode(string.substring(index, index + count))) { |
| 654 | String value = quoteCharCode(point); |
| 655 | if (value != null) { |
| 656 | sb.append(value); |
| 657 | } else { |
| 658 | sb.appendCodePoint(point); |
| 659 | } |
| 660 | index += count; |
| 661 | } else { |
| 662 | sb.append(createString(string.charAt(index))); |
| 663 | index++; |
| 664 | } |
| 665 | } |
| 666 | sb.append("</string>"); |
| 667 | return sb.toString(); |
| 668 | } |
| 669 | |
| 670 | private void outputStatement(Statement exp, Object outer, boolean isArgument) { |
| 671 | Object target = exp.getTarget(); |
| 672 | String methodName = exp.getMethodName(); |
| 673 | |
| 674 | if (target == null || methodName == null) { |
| 675 | throw new NullPointerException((target == null ? "target" : |
| 676 | "methodName") + " should not be null"); |
| 677 | } |
| 678 | |
| 679 | Object[] args = exp.getArguments(); |
| 680 | boolean expression = exp.getClass() == Expression.class; |
| 681 | Object value = (expression) ? getValue((Expression)exp) : null; |
| 682 | |
| 683 | String tag = (expression && isArgument) ? "object" : "void"; |
| 684 | String attributes = ""; |
| 685 | ValueData d = getValueData(value); |
| 686 | if (expression) { |
| 687 | if (d.refs > 1) { |
| 688 | String instanceName = nameGenerator.instanceName(value); |
| 689 | d.name = instanceName; |
| 690 | attributes = attributes + " id=" + quote(instanceName); |
| 691 | } |
| 692 | } |
| 693 | |
| 694 | // Special cases for targets. |
| 695 | if (target == outer) { |
| 696 | } |
| 697 | else if (target == Array.class && methodName.equals("newInstance")) { |
| 698 | tag = "array"; |
| 699 | attributes = attributes + " class=" + quote(((Class)args[0]).getName()); |
| 700 | attributes = attributes + " length=" + quote(args[1].toString()); |
| 701 | args = new Object[]{}; |
| 702 | } |
| 703 | else if (target.getClass() == Class.class) { |
| 704 | attributes = attributes + " class=" + quote(((Class)target).getName()); |
| 705 | } |
| 706 | else { |
| 707 | d.refs = 2; |
| 708 | getValueData(target).refs++; |
| 709 | outputValue(target, outer, false); |
| 710 | if (isArgument) { |
| 711 | outputValue(value, outer, false); |
| 712 | } |
| 713 | return; |
| 714 | } |
| 715 | |
| 716 | |
| 717 | // Special cases for methods. |
| 718 | if ((!expression && methodName.equals("set") && args.length == 2 && |
| 719 | args[0] instanceof Integer) || |
| 720 | (expression && methodName.equals("get") && args.length == 1 && |
| 721 | args[0] instanceof Integer)) { |
| 722 | attributes = attributes + " index=" + quote(args[0].toString()); |
| 723 | args = (args.length == 1) ? new Object[]{} : new Object[]{args[1]}; |
| 724 | } |
| 725 | else if ((!expression && methodName.startsWith("set") && args.length == 1) || |
| 726 | (expression && methodName.startsWith("get") && args.length == 0)) { |
| 727 | attributes = attributes + " property=" + |
| 728 | quote(Introspector.decapitalize(methodName.substring(3))); |
| 729 | } |
| 730 | else if (!methodName.equals("new") && !methodName.equals("newInstance")) { |
| 731 | attributes = attributes + " method=" + quote(methodName); |
| 732 | } |
| 733 | |
| 734 | Vector statements = statementList(value); |
| 735 | // Use XML's short form when there is no body. |
| 736 | if (args.length == 0 && statements.size() == 0) { |
| 737 | writeln("<" + tag + attributes + "/>"); |
| 738 | return; |
| 739 | } |
| 740 | |
| 741 | writeln("<" + tag + attributes + ">"); |
| 742 | indentation++; |
| 743 | |
| 744 | for(int i = 0; i < args.length; i++) { |
| 745 | outputValue(args[i], null, true); |
| 746 | } |
| 747 | |
| 748 | for(int i = 0; i < statements.size(); i++) { |
| 749 | Statement s = (Statement)statements.get(i); |
| 750 | outputStatement(s, value, false); |
| 751 | } |
| 752 | |
| 753 | indentation--; |
| 754 | writeln("</" + tag + ">"); |
| 755 | } |
| 756 | } |