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1
22 package org.jboss.xb.binding;
23
24 import org.jboss.logging.Logger;
25 import org.jboss.util.Base64;
26
27 import javax.xml.namespace.QName  ;
28 import javax.xml.namespace.NamespaceContext ;
29 import java.io.ByteArrayOutputStream ;
30 import java.io.Serializable ;
31 import java.math.BigDecimal ;
32 import java.math.BigInteger ;
33 import java.net.URISyntaxException ;
34 import java.text.DecimalFormat ;
35 import java.text.ParseException ;
36 import java.util.Calendar ;
37 import java.util.StringTokenizer ;
38 import java.util.TimeZone ;
39 import java.util.List ;
40 import java.util.ArrayList ;
41
42
43
48 public final class SimpleTypeBindings
49 implements Serializable
50 {
51 static final long serialVersionUID = 4372272109355825813L;
52
53 public static final String XS_ANYSIMPLETYPE_NAME = "anySimpleType";
54
55 public static final String XS_STRING_NAME = "string";
59 public static final String XS_BOOLEAN_NAME = "boolean";
60 public static final String XS_DECIMAL_NAME = "decimal";
61 public static final String XS_FLOAT_NAME = "float";
62 public static final String XS_DOUBLE_NAME = "double";
63 public static final String XS_DURATION_NAME = "duration";
64 public static final String XS_DATETIME_NAME = "dateTime";
65 public static final String XS_TIME_NAME = "time";
66 public static final String XS_DATE_NAME = "date";
67 public static final String XS_GYEARMONTH_NAME = "gYearMonth";
68 public static final String XS_GYEAR_NAME = "gYear";
69 public static final String XS_GMONTHDAY_NAME = "gMonthDay";
70 public static final String XS_GDAY_NAME = "gDay";
71 public static final String XS_GMONTH_NAME = "gMonth";
72 public static final String XS_HEXBINARY_NAME = "hexBinary";
73 public static final String XS_BASE64BINARY_NAME = "base64Binary";
74 public static final String XS_ANYURI_NAME = "anyURI";
75 public static final String XS_QNAME_NAME = "QName";
76 public static final String XS_NOTATION_NAME = "NOTATION";
77
78
82 public static final String XS_NORMALIZEDSTRING_NAME = "normalizedString";
83 public static final String XS_TOKEN_NAME = "token";
84 public static final String XS_LANGUAGE_NAME = "language";
85 public static final String XS_NMTOKEN_NAME = "NMTOKEN";
86 public static final String XS_NMTOKENS_NAME = "NMTOKENS";
87 public static final String XS_NAME_NAME = "Name";
88 public static final String XS_NCNAME_NAME = "NCName";
89 public static final String XS_ID_NAME = "ID";
90 public static final String XS_IDREF_NAME = "IDREF";
91 public static final String XS_IDREFS_NAME = "IDREFS";
92 public static final String XS_ENTITY_NAME = "ENTITY";
93 public static final String XS_ENTITIES_NAME = "ENTITIES";
94 public static final String XS_INTEGER_NAME = "integer";
95 public static final String XS_NONPOSITIVEINTEGER_NAME = "nonPositiveInteger";
96 public static final String XS_NEGATIVEINTEGER_NAME = "negativeInteger";
97 public static final String XS_LONG_NAME = "long";
98 public static final String XS_INT_NAME = "int";
99 public static final String XS_SHORT_NAME = "short";
100 public static final String XS_BYTE_NAME = "byte";
101 public static final String XS_NONNEGATIVEINTEGER_NAME = "nonNegativeInteger";
102 public static final String XS_UNSIGNEDLONG_NAME = "unsignedLong";
103 public static final String XS_UNSIGNEDINT_NAME = "unsignedInt";
104 public static final String XS_UNSIGNEDSHORT_NAME = "unsignedShort";
105 public static final String XS_UNSIGNEDBYTE_NAME = "unsignedByte";
106 public static final String XS_POSITIVEINTEGER_NAME = "positiveInteger";
107
108 public static final int XS_INT = XS_INT_NAME.hashCode();
109 public static final int XS_LONG = XS_LONG_NAME.hashCode();
110 public static final int XS_SHORT = XS_SHORT_NAME.hashCode();
111 public static final int XS_FLOAT = XS_FLOAT_NAME.hashCode();
112 public static final int XS_DOUBLE = XS_DOUBLE_NAME.hashCode();
113 public static final int XS_BOOLEAN = XS_BOOLEAN_NAME.hashCode();
114 public static final int XS_BYTE = XS_BYTE_NAME.hashCode();
115 public static final int XS_STRING = XS_STRING_NAME.hashCode();
116 public static final int XS_INTEGER = XS_INTEGER_NAME.hashCode();
117 public static final int XS_DECIMAL = XS_DECIMAL_NAME.hashCode();
118 public static final int XS_DATETIME = XS_DATETIME_NAME.hashCode();
119 public static final int XS_QNAME = XS_QNAME_NAME.hashCode();
120 public static final int XS_ANYURI = XS_ANYURI_NAME.hashCode();
121 public static final int XS_UNSIGNEDLONG = XS_UNSIGNEDLONG_NAME.hashCode();
122 public static final int XS_UNSIGNEDINT = XS_UNSIGNEDINT_NAME.hashCode();
123 public static final int XS_UNSIGNEDSHORT = XS_UNSIGNEDSHORT_NAME.hashCode();
124 public static final int XS_UNSIGNEDBYTE = XS_UNSIGNEDBYTE_NAME.hashCode();
125 public static final int XS_DATE = XS_DATE_NAME.hashCode();
126 public static final int XS_TIME = XS_TIME_NAME.hashCode();
127 public static final int XS_BASE64BINARY = XS_BASE64BINARY_NAME.hashCode();
128 public static final int XS_HEXBINARY = XS_HEXBINARY_NAME.hashCode();
129 public static final int XS_ANYSIMPLETYPE = XS_ANYSIMPLETYPE_NAME.hashCode();
130 public static final int XS_DURATION = XS_DURATION_NAME.hashCode();
131 public static final int XS_GYEARMONTH = XS_GYEARMONTH_NAME.hashCode();
132 public static final int XS_GYEAR = XS_GYEAR_NAME.hashCode();
133 public static final int XS_GMONTHDAY = XS_GMONTHDAY_NAME.hashCode();
134 public static final int XS_GMONTH = XS_GMONTH_NAME.hashCode();
135 public static final int XS_GDAY = XS_GDAY_NAME.hashCode();
136 public static final int XS_NORMALIZEDSTRING = XS_NORMALIZEDSTRING_NAME.hashCode();
137 public static final int XS_TOKEN = XS_TOKEN_NAME.hashCode();
138 public static final int XS_LANGUAGE = XS_LANGUAGE_NAME.hashCode();
139 public static final int XS_NAME = XS_NAME_NAME.hashCode();
140 public static final int XS_NCNAME = XS_NCNAME_NAME.hashCode();
141 public static final int XS_ID = XS_ID_NAME.hashCode();
142 public static final int XS_NMTOKEN = XS_NMTOKEN_NAME.hashCode();
143 public static final int XS_NMTOKENS = XS_NMTOKENS_NAME.hashCode();
144 public static final int XS_NONPOSITIVEINTEGER = XS_NONPOSITIVEINTEGER_NAME.hashCode();
145 public static final int XS_NEGATIVEINTEGER = XS_NEGATIVEINTEGER_NAME.hashCode();
146 public static final int XS_NONNEGATIVEINTEGER = XS_NONNEGATIVEINTEGER_NAME.hashCode();
147 public static final int XS_POSITIVEINTEGER = XS_POSITIVEINTEGER_NAME.hashCode();
148 public static final int XS_NOTATION = XS_NOTATION_NAME.hashCode();
149 public static final int XS_IDREF = XS_IDREF_NAME.hashCode();
150 public static final int XS_IDREFS = XS_IDREFS_NAME.hashCode();
151 public static final int XS_ENTITY = XS_ENTITY_NAME.hashCode();
152 public static final int XS_ENTITIES = XS_ENTITIES_NAME.hashCode();
153
154 public static final TypeBinding STRING = new TypeBinding()
155 {
156 public Object unmarshal(String value)
157 {
158 return value;
159 }
160
161 public String marshal(Object value)
162 {
163 return (String )value;
164 }
165 };
166
167 public static final TypeBinding INT = new TypeBinding()
168 {
169 public Object unmarshal(String value)
170 {
171 return Integer.valueOf(value);
172 }
173
174 public String marshal(Object value)
175 {
176 return String.valueOf(value);
177 }
178 };
179
180 public static final TypeBinding LONG = new TypeBinding()
181 {
182 public Object unmarshal(String value)
183 {
184 return Long.valueOf(value);
185 }
186
187 public String marshal(Object value)
188 {
189 return String.valueOf(value);
190 }
191 };
192
193 public static final TypeBinding DOUBLE = new TypeBinding()
194 {
195 public Object unmarshal(String value)
196 {
197 return Double.valueOf(value);
198 }
199
200 public String marshal(Object value)
201 {
202 return String.valueOf(value);
203 }
204 };
205
206 public static final TypeBinding FLOAT = new TypeBinding()
207 {
208 public Object unmarshal(String value)
209 {
210 return Float.valueOf(value);
211 }
212
213 public String marshal(Object value)
214 {
215 return String.valueOf(value);
216 }
217 };
218
219 public static final TypeBinding SHORT = new TypeBinding()
220 {
221 public Object unmarshal(String value)
222 {
223 return Short.valueOf(value);
224 }
225
226 public String marshal(Object value)
227 {
228 return String.valueOf(value);
229 }
230 };
231
232 public static final TypeBinding BYTE = new TypeBinding()
233 {
234 public Object unmarshal(String value)
235 {
236 return Byte.valueOf(value);
237 }
238
239 public String marshal(Object value)
240 {
241 return String.valueOf(value);
242 }
243 };
244
245 public static final TypeBinding CHAR = new TypeBinding()
246 {
247 public Object unmarshal(String value)
248 {
249 return value == null ? null : new Character (value.charAt(0));
250 }
251
252 public String marshal(Object value)
253 {
254 return String.valueOf(value);
255 }
256 };
257
258 public static final TypeBinding JAVA_UTIL_DATE = new TypeBinding()
259 {
260 public Object unmarshal(String value)
261 {
262 return unmarshalDate(value).getTime();
263 }
264
265 public String marshal(Object value)
266 {
267 Calendar c = Calendar.getInstance();
268 c.setTime((java.util.Date )value);
269 return marshalDate(c);
270 }
271 };
272
273 static
275 {
276 int[] codes = new int[45];
277 String [] names = new String [codes.length];
278 int i = 0;
279
280 names[i] = XS_INT_NAME;
281 codes[i++] = XS_INT;
282
283 names[i] = XS_LONG_NAME;
284 codes[i++] = XS_LONG;
285
286 names[i] = XS_SHORT_NAME;
287 codes[i++] = XS_SHORT;
288
289 names[i] = XS_FLOAT_NAME;
290 codes[i++] = XS_FLOAT;
291
292 names[i] = XS_DOUBLE_NAME;
293 codes[i++] = XS_DOUBLE;
294
295 names[i] = XS_BOOLEAN_NAME;
296 codes[i++] = XS_BOOLEAN;
297
298 names[i] = XS_BYTE_NAME;
299 codes[i++] = XS_BYTE;
300
301 names[i] = XS_STRING_NAME;
302 codes[i++] = XS_STRING;
303
304 names[i] = XS_INTEGER_NAME;
305 codes[i++] = XS_INTEGER;
306
307 names[i] = XS_DECIMAL_NAME;
308 codes[i++] = XS_DECIMAL;
309
310 names[i] = XS_DATETIME_NAME;
311 codes[i++] = XS_DATETIME;
312
313 names[i] = XS_QNAME_NAME;
314 codes[i++] = XS_QNAME;
315
316 names[i] = XS_ANYURI_NAME;
317 codes[i++] = XS_ANYURI;
318
319 names[i] = XS_UNSIGNEDINT_NAME;
320 codes[i++] = XS_UNSIGNEDINT;
321
322 names[i] = XS_UNSIGNEDSHORT_NAME;
323 codes[i++] = XS_UNSIGNEDSHORT;
324
325 names[i] = XS_UNSIGNEDBYTE_NAME;
326 codes[i++] = XS_UNSIGNEDBYTE;
327
328 names[i] = XS_DATE_NAME;
329 codes[i++] = XS_DATE;
330
331 names[i] = XS_TIME_NAME;
332 codes[i++] = XS_TIME;
333
334 names[i] = XS_BASE64BINARY_NAME;
335 codes[i++] = XS_BASE64BINARY;
336
337 names[i] = XS_HEXBINARY_NAME;
338 codes[i++] = XS_HEXBINARY;
339
340 names[i] = XS_ANYSIMPLETYPE_NAME;
341 codes[i++] = XS_ANYSIMPLETYPE;
342
343 names[i] = XS_DURATION_NAME;
344 codes[i++] = XS_DURATION;
345
346 names[i] = XS_GYEARMONTH_NAME;
347 codes[i++] = XS_GYEARMONTH;
348
349 names[i] = XS_GYEAR_NAME;
350 codes[i++] = XS_GYEAR;
351
352 names[i] = XS_GMONTHDAY_NAME;
353 codes[i++] = XS_GMONTHDAY;
354
355 names[i] = XS_GMONTH_NAME;
356 codes[i++] = XS_GMONTH;
357
358 names[i] = XS_GDAY_NAME;
359 codes[i++] = XS_GDAY;
360
361 names[i] = XS_NORMALIZEDSTRING_NAME;
362 codes[i++] = XS_NORMALIZEDSTRING;
363
364 names[i] = XS_TOKEN_NAME;
365 codes[i++] = XS_TOKEN;
366
367 names[i] = XS_LANGUAGE_NAME;
368 codes[i++] = XS_LANGUAGE;
369
370 names[i] = XS_NAME_NAME;
371 codes[i++] = XS_NAME;
372
373 names[i] = XS_NCNAME_NAME;
374 codes[i++] = XS_NCNAME;
375
376 names[i] = XS_ID_NAME;
377 codes[i++] = XS_ID;
378
379 names[i] = XS_NMTOKEN_NAME;
380 codes[i++] = XS_NMTOKEN;
381
382 names[i] = XS_NMTOKENS_NAME;
383 codes[i++] = XS_NMTOKENS;
384
385 names[i] = XS_NONPOSITIVEINTEGER_NAME;
386 codes[i++] = XS_NONPOSITIVEINTEGER;
387
388 names[i] = XS_NONNEGATIVEINTEGER_NAME;
389 codes[i++] = XS_NONNEGATIVEINTEGER;
390
391 names[i] = XS_POSITIVEINTEGER_NAME;
392 codes[i++] = XS_POSITIVEINTEGER;
393
394 names[i] = XS_NEGATIVEINTEGER_NAME;
395 codes[i++] = XS_NEGATIVEINTEGER;
396
397 names[i] = XS_UNSIGNEDLONG_NAME;
398 codes[i++] = XS_UNSIGNEDLONG;
399
400 names[i] = XS_NOTATION_NAME;
401 codes[i++] = XS_NOTATION;
402
403 names[i] = XS_IDREF_NAME;
404 codes[i++] = XS_IDREF;
405
406 names[i] = XS_IDREFS_NAME;
407 codes[i++] = XS_IDREFS;
408
409 names[i] = XS_ENTITY_NAME;
410 codes[i++] = XS_ENTITY;
411
412 names[i] = XS_ENTITIES_NAME;
413 codes[i++] = XS_ENTITIES;
414
415 Logger log = Logger.getLogger(SimpleTypeBindings.class);
416 boolean allAreUnique = true;
417 for(int outer = 0; outer < names.length; ++outer)
418 {
419 int outerCode = codes[outer];
420 String outerName = names[outer];
421
422 for(int inner = outer + 1; inner < names.length; ++inner)
423 {
424 int innerCode = codes[inner];
425 String innerName = names[inner];
426
427 if(outerCode == innerCode)
428 {
429 log.error("Types have the same hash code " + outerCode + ": " + outerName + " and " + innerName);
430 allAreUnique = false;
431 }
432 }
433 }
434
435 if(!allAreUnique)
436 {
437 throw new IllegalStateException ("Not all the schema types have unique hash codes! See log for more details.");
438 }
439 }
440
441 public static Class classForType(String xsdType, boolean nillable)
442 {
443 Class result;
444 int typeCode = xsdType.hashCode();
445 if(typeCode == XS_INT)
446 {
447 result = nillable ? Integer .class : int.class;
448 }
449 else if(typeCode == XS_LONG)
450 {
451 result = nillable ? Long .class : long.class;
452 }
453 else if(typeCode == XS_SHORT)
454 {
455 result = nillable ? Short .class : short.class;
456 }
457 else if(typeCode == XS_BYTE)
458 {
459 result = nillable ? Byte .class : byte.class;
460 }
461 else if(typeCode == XS_FLOAT)
462 {
463 result = nillable ? Float .class : float.class;
464 }
465 else if(typeCode == XS_DOUBLE)
466 {
467 result = nillable ? Double .class : double.class;
468 }
469 else if(typeCode == XS_BOOLEAN)
470 {
471 result = nillable ? Boolean .class : boolean.class;
472 }
473 else if(typeCode == XS_STRING)
474 {
475 result = String .class;
476 }
477 else if(typeCode == XS_INTEGER)
478 {
479 result = BigInteger .class;
480 }
481 else if(typeCode == XS_DECIMAL)
482 {
483 result = BigDecimal .class;
484 }
485 else if(typeCode == XS_DATETIME)
486 {
487 result = java.util.Calendar .class;
488 }
489 else if(typeCode == XS_QNAME)
490 {
491 result = QName .class;
492 }
493 else if(typeCode == XS_ANYURI)
494 {
495 result = java.net.URI .class;
504 }
505 else if(typeCode == XS_UNSIGNEDLONG)
506 {
507 result = BigInteger .class;
508 }
509 else if(typeCode == XS_UNSIGNEDINT)
510 {
511 result = nillable ? Long .class : long.class;
512 }
513 else if(typeCode == XS_UNSIGNEDSHORT)
514 {
515 result = nillable ? Integer .class : int.class;
516 }
517 else if(typeCode == XS_UNSIGNEDBYTE)
518 {
519 result = nillable ? Short .class : short.class;
520 }
521 else if(typeCode == XS_DATE)
522 {
523 result = Calendar .class;
524 }
525 else if(typeCode == XS_TIME)
526 {
527 result = Calendar .class;
528 }
529 else if(typeCode == XS_BASE64BINARY)
530 {
531 result = byte[].class;
532 }
533 else if(typeCode == XS_HEXBINARY)
534 {
535 result = byte[].class;
536 }
537 else if(typeCode == XS_ANYSIMPLETYPE)
538 {
539 result = String .class;
540 }
541 else if(typeCode == XS_DURATION)
542 {
543 throw new IllegalStateException ("Recognized but not supported xsdType: " + XS_DURATION_NAME);
545 }
546 else if(typeCode == XS_GYEARMONTH)
547 {
548 result = Calendar .class;
549 }
550 else if(typeCode == XS_GYEAR)
551 {
552 result = Calendar .class;
553 }
554 else if(typeCode == XS_GMONTHDAY)
555 {
556 result = Calendar .class;
557 }
558 else if(typeCode == XS_GMONTH)
559 {
560 result = Calendar .class;
561 }
562 else if(typeCode == XS_GDAY)
563 {
564 result = Calendar .class;
565 }
566 else if(typeCode == XS_NORMALIZEDSTRING)
567 {
568 result = String .class;
569 }
570 else if(typeCode == XS_TOKEN)
571 {
572 result = String .class;
573 }
574 else if(typeCode == XS_LANGUAGE)
575 {
576 result = String .class;
577 }
578 else if(typeCode == XS_NAME)
579 {
580 result = String .class;
581 }
582 else if(typeCode == XS_NCNAME)
583 {
584 result = String .class;
585 }
586 else if(typeCode == XS_ID)
587 {
588 result = String .class;
589 }
590 else if(typeCode == XS_NMTOKEN)
591 {
592 result = String .class;
593 }
594 else if(typeCode == XS_NMTOKENS)
595 {
596 result = String [].class;
597 }
598 else if(typeCode == XS_NONPOSITIVEINTEGER)
599 {
600 result = BigInteger .class;
601 }
602 else if(typeCode == XS_NEGATIVEINTEGER)
603 {
604 result = BigInteger .class;
605 }
606 else if(typeCode == XS_NONNEGATIVEINTEGER)
607 {
608 result = BigInteger .class;
609 }
610 else if(typeCode == XS_POSITIVEINTEGER)
611 {
612 result = BigInteger .class;
613 }
614 else if(typeCode == XS_NOTATION)
615 {
616 result = String .class;
617 }
618 else if(typeCode == XS_IDREF)
619 {
620 result = String .class;
621 }
622 else if(typeCode == XS_IDREFS)
623 {
624 result = String [].class;
625 }
626 else if(typeCode == XS_ENTITY)
627 {
628 result = String .class;
629 }
630 else if(typeCode == XS_ENTITIES)
631 {
632 result = String [].class;
633 }
634 else
635 {
636 throw new IllegalStateException ("Not supported xsdType: " + xsdType + ", hashCode=" + xsdType.hashCode());
637 }
638 return result;
639 }
640
641 public static Object unmarshal(String xsdType, String value, NamespaceContext nsCtx)
642 {
643 if (xsdType == null)
644 throw new IllegalArgumentException ("Schema type cannot be null");
645 if (value == null)
646 throw new IllegalArgumentException ("Value string cannot be null");
647
648 int typeCode = xsdType.hashCode();
649 Object result;
650 if(typeCode == XS_INT)
651 {
652 result = Integer.valueOf(value);
653 }
654 else if(typeCode == XS_LONG)
655 {
656 result = Long.valueOf(value);
657 }
658 else if(typeCode == XS_SHORT)
659 {
660 result = Short.valueOf(value);
661 }
662 else if(typeCode == XS_BYTE)
663 {
664 result = Byte.valueOf(value);
665 }
666 else if(typeCode == XS_FLOAT)
667 {
668 if("INF".equals(value))
669 {
670 result = new Float (Float.POSITIVE_INFINITY);
671 }
672 else if("-INF".equals(value))
673 {
674 result = new Float (Float.NEGATIVE_INFINITY);
675 }
676 else
677 {
678 result = Float.valueOf(value);
679 }
680 }
681 else if(typeCode == XS_DOUBLE)
682 {
683 if("INF".equals(value))
684 {
685 result = new Double (Double.POSITIVE_INFINITY);
686 }
687 else if("-INF".equals(value))
688 {
689 result = new Double (Double.NEGATIVE_INFINITY);
690 }
691 else
692 {
693 result = Double.valueOf(value);
694 }
695 }
696 else if(typeCode == XS_BOOLEAN)
697 {
698 if(value.length() == 1)
699 {
700 switch(value.charAt(0))
701 {
702 case '1':
703 result = Boolean.TRUE;
704 break;
705 case '0':
706 result = Boolean.FALSE;
707 break;
708 default:
709 throw new JBossXBValueFormatException("An instance of a datatype that is defined as ?boolean? can have the following legal literals" +
710 " {true, false, 1, 0}. But got: " + value
711 );
712 }
713 }
714 else
715 {
716 result = Boolean.valueOf(value);
717 }
718 }
719 else if(typeCode == XS_STRING)
720 {
721 result = value;
722 }
723 else if(typeCode == XS_INTEGER)
724 {
725 result = new BigInteger (value);
726 }
727 else if(typeCode == XS_DECIMAL)
728 {
729 result = new BigDecimal (value);
730 }
731 else if(typeCode == XS_DATETIME)
732 {
733 result = unmarshalDateTime(value);
734 }
735 else if(typeCode == XS_QNAME)
736 {
737 result = unmarshalQName(value, nsCtx);
738 }
739 else if(typeCode == XS_ANYURI)
740 {
741 try
750 {
751 result = new java.net.URI (value);
752 }
753 catch(URISyntaxException e)
754 {
755 throw new JBossXBValueFormatException("Failed to unmarshal anyURI value " + value, e);
756 }
757 }
758 else if(typeCode == XS_UNSIGNEDLONG)
759 {
760 BigInteger d = new BigInteger (value);
761 if(d.doubleValue() < 0 || d.doubleValue() > 18446744073709551615D)
762 {
763 throw new JBossXBValueFormatException("Invalid unsignedLong value: " + value);
764 }
765 result = d;
766 }
767 else if(typeCode == XS_UNSIGNEDINT)
768 {
769 long l = Long.parseLong(value);
770 if(l < 0 || l > 4294967295L)
771 {
772 throw new JBossXBValueFormatException("Invalid unsignedInt value: " + value);
773 }
774 result = new Long (l);
775 }
776 else if(typeCode == XS_UNSIGNEDSHORT)
777 {
778 int i = Integer.parseInt(value);
779 if(i < 0 || i > 65535)
780 {
781
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Java API By Example, From Geeks To Geeks.