1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
|
/*
* Javassist, a Java-bytecode translator toolkit.
* Copyright (C) 1999-2007 Shigeru Chiba. All Rights Reserved.
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. Alternatively, the contents of this file may be used under
* the terms of the GNU Lesser General Public License Version 2.1 or later.
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*/
package javassist;
import java.io.BufferedOutputStream;
import java.io.ByteArrayOutputStream;
import java.io.DataOutputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.net.URL;
import java.security.ProtectionDomain;
import java.util.Collection;
import javassist.bytecode.ClassFile;
import javassist.bytecode.Descriptor;
import javassist.bytecode.Opcode;
import javassist.expr.ExprEditor;
/* Note:
*
* This class is an abstract class and several methods just return null
* or throw an exception. Those methods are overridden in subclasses
* of this class. Read the source code of CtClassType if you are
* interested in the implementation of Javassist.
*
* Subclasses of CtClass are CtClassType, CtPrimitiveType, and CtArray.
*/
/**
* An instance of <code>CtClass</code> represents a class.
* It is obtained from <code>ClassPool</code>.
*
* @see ClassPool#get(String)
*/
public abstract class CtClass {
protected String qualifiedName;
/**
* The version number of this release.
*/
public static final String version = "3.14.0.GA";
/**
* Prints the version number and the copyright notice.
*
* <p>The following command invokes this method:
*
* <ul><pre>java -jar javassist.jar</pre></ul>
*/
public static void main(String[] args) {
System.out.println("Javassist version " + CtClass.version);
System.out.println("Copyright (C) 1999-2010 Shigeru Chiba."
+ " All Rights Reserved.");
}
static final String javaLangObject = "java.lang.Object";
/**
* The <code>CtClass</code> object representing
* the <code>boolean</code> type.
*/
public static CtClass booleanType;
/**
* The <code>CtClass</code> object representing
* the <code>char</code> type.
*/
public static CtClass charType;
/**
* The <code>CtClass</code> object representing
* the <code>byte</code> type.
*/
public static CtClass byteType;
/**
* The <code>CtClass</code> object representing
* the <code>short</code> type.
*/
public static CtClass shortType;
/**
* The <code>CtClass</code> object representing
* the <code>int</code> type.
*/
public static CtClass intType;
/**
* The <code>CtClass</code> object representing
* the <code>long</code> type.
*/
public static CtClass longType;
/**
* The <code>CtClass</code> object representing
* the <code>float</code> type.
*/
public static CtClass floatType;
/**
* The <code>CtClass</code> object representing
* the <code>double</code> type.
*/
public static CtClass doubleType;
/**
* The <code>CtClass</code> object representing
* the <code>void</code> type.
*/
public static CtClass voidType;
static CtClass[] primitiveTypes;
static {
primitiveTypes = new CtClass[9];
booleanType =
new CtPrimitiveType("boolean", 'Z', "java.lang.Boolean",
"booleanValue", "()Z", Opcode.IRETURN,
Opcode.T_BOOLEAN, 1);
primitiveTypes[0] = booleanType;
charType = new CtPrimitiveType("char", 'C', "java.lang.Character",
"charValue", "()C", Opcode.IRETURN,
Opcode.T_CHAR, 1);
primitiveTypes[1] = charType;
byteType = new CtPrimitiveType("byte", 'B', "java.lang.Byte",
"byteValue", "()B", Opcode.IRETURN,
Opcode.T_BYTE, 1);
primitiveTypes[2] = byteType;
shortType = new CtPrimitiveType("short", 'S', "java.lang.Short",
"shortValue", "()S", Opcode.IRETURN,
Opcode.T_SHORT, 1);
primitiveTypes[3] = shortType;
intType = new CtPrimitiveType("int", 'I', "java.lang.Integer",
"intValue", "()I", Opcode.IRETURN,
Opcode.T_INT, 1);
primitiveTypes[4] = intType;
longType = new CtPrimitiveType("long", 'J', "java.lang.Long",
"longValue", "()J", Opcode.LRETURN,
Opcode.T_LONG, 2);
primitiveTypes[5] = longType;
floatType = new CtPrimitiveType("float", 'F', "java.lang.Float",
"floatValue", "()F", Opcode.FRETURN,
Opcode.T_FLOAT, 1);
primitiveTypes[6] = floatType;
doubleType = new CtPrimitiveType("double", 'D', "java.lang.Double",
"doubleValue", "()D", Opcode.DRETURN,
Opcode.T_DOUBLE, 2);
primitiveTypes[7] = doubleType;
voidType = new CtPrimitiveType("void", 'V', "java.lang.Void",
null, null, Opcode.RETURN, 0, 0);
primitiveTypes[8] = voidType;
}
protected CtClass(String name) {
qualifiedName = name;
}
/**
* Converts the object to a string.
*/
public String toString() {
StringBuffer buf = new StringBuffer(getClass().getName());
buf.append("@");
buf.append(Integer.toHexString(hashCode()));
buf.append("[");
extendToString(buf);
buf.append("]");
return buf.toString();
}
/**
* Implemented in subclasses to add to the {@link #toString()} result.
* Subclasses should put a space before each token added to the buffer.
*/
protected void extendToString(StringBuffer buffer) {
buffer.append(getName());
}
/**
* Returns a <code>ClassPool</code> for this class.
*/
public ClassPool getClassPool() { return null; }
/**
* Returns a class file for this class.
*
* <p>This method is not available if <code>isFrozen()</code>
* is true.
*/
public ClassFile getClassFile() {
checkModify();
return getClassFile2();
}
/**
* Returns a class file for this class (read only).
* Normal applications do not need calling this method. Use
* <code>getClassFile()</code>.
*
* <p>The <code>ClassFile</code> object obtained by this method
* is read only. Changes to this object might not be reflected
* on a class file generated by <code>toBytecode()</code>,
* <code>toClass()</code>, etc.
*
* <p>This method is available even if <code>isFrozen()</code>
* is true. However, if the class is frozen, it might be also
* pruned.
*
* @see CtClass#getClassFile()
* @see CtClass#isFrozen()
* @see CtClass#prune()
*/
public ClassFile getClassFile2() { return null; }
/**
* Undocumented method. Do not use; internal-use only.
*/
public javassist.compiler.AccessorMaker getAccessorMaker() {
return null;
}
/**
* Returns the uniform resource locator (URL) of the class file.
*/
public URL getURL() throws NotFoundException {
throw new NotFoundException(getName());
}
/**
* Returns true if the definition of the class has been modified.
*/
public boolean isModified() { return false; }
/**
* Returns true if the class has been loaded or written out
* and thus it cannot be modified any more.
*
* @see #defrost()
* @see #detach()
*/
public boolean isFrozen() { return true; }
/**
* Makes the class frozen.
*
* @see #isFrozen()
* @see #defrost()
* @since 3.6
*/
public void freeze() {}
/* Note: this method is overridden by CtClassType
*/
void checkModify() throws RuntimeException {
if (isFrozen())
throw new RuntimeException(getName() + " class is frozen");
// isModified() must return true after this method is invoked.
}
/**
* Defrosts the class so that the class can be modified again.
*
* <p>To avoid changes that will be never reflected,
* the class is frozen to be unmodifiable if it is loaded or
* written out. This method should be called only in a case
* that the class will be reloaded or written out later again.
*
* <p>If <code>defrost()</code> will be called later, pruning
* must be disallowed in advance.
*
* @see #isFrozen()
* @see #stopPruning(boolean)
* @see #detach()
*/
public void defrost() {
throw new RuntimeException("cannot defrost " + getName());
}
/**
* Returns <code>true</code> if this object represents a primitive
* Java type: boolean, byte, char, short, int, long, float, double,
* or void.
*/
public boolean isPrimitive() { return false; }
/**
* Returns <code>true</code> if this object represents an array type.
*/
public boolean isArray() {
return false;
}
/**
* If this object represents an array, this method returns the component
* type of the array. Otherwise, it returns <code>null</code>.
*/
public CtClass getComponentType() throws NotFoundException {
return null;
}
/**
* Returns <code>true</code> if this class extends or implements
* <code>clazz</code>. It also returns <code>true</code> if
* this class is the same as <code>clazz</code>.
*/
public boolean subtypeOf(CtClass clazz) throws NotFoundException {
return this == clazz || getName().equals(clazz.getName());
}
/**
* Obtains the fully-qualified name of the class.
*/
public String getName() { return qualifiedName; }
/**
* Obtains the not-qualified class name.
*/
public final String getSimpleName() {
String qname = qualifiedName;
int index = qname.lastIndexOf('.');
if (index < 0)
return qname;
else
return qname.substring(index + 1);
}
/**
* Obtains the package name. It may be <code>null</code>.
*/
public final String getPackageName() {
String qname = qualifiedName;
int index = qname.lastIndexOf('.');
if (index < 0)
return null;
else
return qname.substring(0, index);
}
/**
* Sets the class name
*
* @param name fully-qualified name
*/
public void setName(String name) {
checkModify();
if (name != null)
qualifiedName = name;
}
/**
* Substitutes <code>newName</code> for all occurrences of a class
* name <code>oldName</code> in the class file.
*
* @param oldName replaced class name
* @param newName substituted class name
*/
public void replaceClassName(String oldName, String newName) {
checkModify();
}
/**
* Changes class names appearing in the class file according to the
* given <code>map</code>.
*
* <p>All the class names appearing in the class file are tested
* with <code>map</code> to determine whether each class name is
* replaced or not. Thus this method can be used for collecting
* all the class names in the class file. To do that, first define
* a subclass of <code>ClassMap</code> so that <code>get()</code>
* records all the given parameters. Then, make an instance of
* that subclass as an empty hash-table. Finally, pass that instance
* to this method. After this method finishes, that instance would
* contain all the class names appearing in the class file.
*
* @param map the hashtable associating replaced class names
* with substituted names.
*/
public void replaceClassName(ClassMap map) {
checkModify();
}
/**
* Returns a collection of the names of all the classes
* referenced in this class.
* That collection includes the name of this class.
*
* <p>This method may return <code>null</code>.
*
* @return a <code>Collection<String></code> object.
*/
public synchronized Collection getRefClasses() {
ClassFile cf = getClassFile2();
if (cf != null) {
ClassMap cm = new ClassMap() {
public void put(String oldname, String newname) {
put0(oldname, newname);
}
public Object get(Object jvmClassName) {
String n = toJavaName((String)jvmClassName);
put0(n, n);
return null;
}
public void fix(String name) {}
};
cf.getRefClasses(cm);
return cm.values();
}
else
return null;
}
/**
* Determines whether this object represents a class or an interface.
* It returns <code>true</code> if this object represents an interface.
*/
public boolean isInterface() {
return false;
}
/**
* Determines whether this object represents an annotation type.
* It returns <code>true</code> if this object represents an annotation type.
*
* @since 3.2
*/
public boolean isAnnotation() {
return false;
}
/**
* Determines whether this object represents an enum.
* It returns <code>true</code> if this object represents an enum.
*
* @since 3.2
*/
public boolean isEnum() {
return false;
}
/**
* Returns the modifiers for this class, encoded in an integer.
* For decoding, use <code>javassist.Modifier</code>.
*
* <p>If the class is a static nested class (a.k.a. static inner class),
* the returned modifiers include <code>Modifier.STATIC</code>.
*
* @see Modifier
*/
public int getModifiers() {
return 0;
}
/**
* Returns true if the class has the specified annotation class.
*
* @param clz the annotation class.
* @return <code>true</code> if the annotation is found, otherwise <code>false</code>.
* @since 3.11
*/
public boolean hasAnnotation(Class clz) {
return false;
}
/**
* Returns the annotation if the class has the specified annotation class.
* For example, if an annotation <code>@Author</code> is associated
* with this class, an <code>Author</code> object is returned.
* The member values can be obtained by calling methods on
* the <code>Author</code> object.
*
* @param clz the annotation class.
* @return the annotation if found, otherwise <code>null</code>.
* @since 3.11
*/
public Object getAnnotation(Class clz) throws ClassNotFoundException {
return null;
}
/**
* Returns the annotations associated with this class.
* For example, if an annotation <code>@Author</code> is associated
* with this class, the returned array contains an <code>Author</code>
* object. The member values can be obtained by calling methods on
* the <code>Author</code> object.
*
* @return an array of annotation-type objects.
* @see CtMember#getAnnotations()
* @since 3.1
*/
public Object[] getAnnotations() throws ClassNotFoundException {
return new Object[0];
}
/**
* Returns the annotations associated with this class.
* This method is equivalent to <code>getAnnotations()</code>
* except that, if any annotations are not on the classpath,
* they are not included in the returned array.
*
* @return an array of annotation-type objects.
* @see #getAnnotations()
* @see CtMember#getAvailableAnnotations()
* @since 3.3
*/
public Object[] getAvailableAnnotations(){
return new Object[0];
}
/**
* Returns an array of nested classes declared in the class.
* Nested classes are inner classes, anonymous classes, local classes,
* and static nested classes. This simply calls <code>getNestedClasses()</code>.
*
* @see #getNestedClasses()
* @since 3.15
*/
public CtClass[] getDeclaredClasses() throws NotFoundException {
return getNestedClasses();
}
/**
* Returns an array of nested classes declared in the class.
* Nested classes are inner classes, anonymous classes, local classes,
* and static nested classes.
*
* @since 3.2
*/
public CtClass[] getNestedClasses() throws NotFoundException {
return new CtClass[0];
}
/**
* Sets the modifiers.
*
* <p>If the class is a nested class, this method also modifies
* the class declaring that nested class (i.e. the enclosing
* class is modified).
*
* @param mod modifiers encoded by
* <code>javassist.Modifier</code>
* @see Modifier
*/
public void setModifiers(int mod) {
checkModify();
}
/**
* Determines whether the class directly or indirectly extends
* the given class. If this class extends a class A and
* the class A extends a class B, then subclassof(B) returns true.
*
* <p>This method returns true if the given class is identical to
* the class represented by this object.
*/
public boolean subclassOf(CtClass superclass) {
return false;
}
/**
* Obtains the class object representing the superclass of the
* class.
* It returns null if this object represents the
* <code>java.lang.Object</code> class and thus it does not have
* the super class.
*
* <p>If this object represents an interface, this method
* always returns the <code>java.lang.Object</code> class.
* To obtain the super interfaces
* extended by that interface, call <code>getInterfaces()</code>.
*/
public CtClass getSuperclass() throws NotFoundException {
return null;
}
/**
* Changes a super class unless this object represents an interface.
* The new super class must be compatible with the old one; for example,
* it should inherit from the old super class.
*
* <p>If this object represents an interface, this method is equivalent
* to <code>addInterface()</code>; it appends <code>clazz</code> to
* the list of the super interfaces extended by that interface.
* Note that an interface can extend multiple super interfaces.
*
* @see #replaceClassName(String, String)
* @see #replaceClassName(ClassMap)
*/
public void setSuperclass(CtClass clazz) throws CannotCompileException {
checkModify();
}
/**
* Obtains the class objects representing the interfaces implemented
* by the class or, if this object represents an interface, the interfaces
* extended by that interface.
*/
public CtClass[] getInterfaces() throws NotFoundException {
return new CtClass[0];
}
/**
* Sets implemented interfaces. If this object represents an interface,
* this method sets the interfaces extended by that interface.
*
* @param list a list of the <code>CtClass</code> objects
* representing interfaces, or
* <code>null</code> if the class implements
* no interfaces.
*/
public void setInterfaces(CtClass[] list) {
checkModify();
}
/**
* Adds an interface.
*
* @param anInterface the added interface.
*/
public void addInterface(CtClass anInterface) {
checkModify();
}
/**
* If this class is a member class or interface of another class,
* then the class enclosing this class is returned.
*
* @return null if this class is a top-level class or an anonymous class.
*/
public CtClass getDeclaringClass() throws NotFoundException {
return null;
}
/**
* Returns the immediately enclosing method of this class.
* This method works only with JDK 1.5 or later.
*
* @return null if this class is not a local class or an anonymous
* class.
*/
public CtMethod getEnclosingMethod() throws NotFoundException {
return null;
}
/**
* Makes a new public nested class. If this method is called,
* the <code>CtClass</code>, which encloses the nested class, is modified
* since a class file includes a list of nested classes.
*
* <p>The current implementation only supports a static nested class.
* <code>isStatic</code> must be true.
*
* @param name the simple name of the nested class.
* @param isStatic true if the nested class is static.
*/
public CtClass makeNestedClass(String name, boolean isStatic) {
throw new RuntimeException(getName() + " is not a class");
}
/**
* Returns an array containing <code>CtField</code> objects
* representing all the non-private fields of the class.
* That array includes non-private fields inherited from the
* superclasses.
*/
public CtField[] getFields() { return new CtField[0]; }
/**
* Returns the field with the specified name. The returned field
* may be a private field declared in a super class or interface.
*/
public CtField getField(String name) throws NotFoundException {
return getField(name, null);
}
/**
* Returns the field with the specified name and type. The returned field
* may be a private field declared in a super class or interface.
* Unlike Java, the JVM allows a class to have
* multiple fields with the same name but different types.
*
* @param name the field name.
* @param desc the type descriptor of the field. It is available by
* {@link CtField#getSignature()}.
* @see CtField#getSignature()
*/
public CtField getField(String name, String desc) throws NotFoundException {
throw new NotFoundException(name);
}
/**
* @return null if the specified field is not found.
*/
CtField getField2(String name, String desc) { return null; }
/**
* Gets all the fields declared in the class. The inherited fields
* are not included.
*
* <p>Note: the result does not include inherited fields.
*/
public CtField[] getDeclaredFields() { return new CtField[0]; }
/**
* Retrieves the field with the specified name among the fields
* declared in the class.
*
* <p>Note: this method does not search the super classes.
*/
public CtField getDeclaredField(String name) throws NotFoundException {
throw new NotFoundException(name);
}
/**
* Retrieves the field with the specified name and type among the fields
* declared in the class. Unlike Java, the JVM allows a class to have
* multiple fields with the same name but different types.
*
* <p>Note: this method does not search the super classes.
*
* @param name the field name.
* @param desc the type descriptor of the field. It is available by
* {@link CtField#getSignature()}.
* @see CtField#getSignature()
*/
public CtField getDeclaredField(String name, String desc) throws NotFoundException {
throw new NotFoundException(name);
}
/**
* Gets all the constructors and methods declared in the class.
*/
public CtBehavior[] getDeclaredBehaviors() {
return new CtBehavior[0];
}
/**
* Returns an array containing <code>CtConstructor</code> objects
* representing all the non-private constructors of the class.
*/
public CtConstructor[] getConstructors() {
return new CtConstructor[0];
}
/**
* Returns the constructor with the given signature,
* which is represented by a character string
* called method descriptor.
* For details of the method descriptor, see the JVM specification
* or <code>javassist.bytecode.Descriptor</code>.
*
* @param desc method descriptor
* @see javassist.bytecode.Descriptor
*/
public CtConstructor getConstructor(String desc)
throws NotFoundException
{
throw new NotFoundException("no such constructor");
}
/**
* Gets all the constructors declared in the class.
*
* @see javassist.CtConstructor
*/
public CtConstructor[] getDeclaredConstructors() {
return new CtConstructor[0];
}
/**
* Returns a constructor receiving the specified parameters.
*
* @param params parameter types.
*/
public CtConstructor getDeclaredConstructor(CtClass[] params)
throws NotFoundException
{
String desc = Descriptor.ofConstructor(params);
return getConstructor(desc);
}
/**
* Gets the class initializer (static constructor)
* declared in the class.
* This method returns <code>null</code> if
* no class initializer is not declared.
*
* @see #makeClassInitializer()
* @see javassist.CtConstructor
*/
public CtConstructor getClassInitializer() {
return null;
}
/**
* Returns an array containing <code>CtMethod</code> objects
* representing all the non-private methods of the class.
* That array includes non-private methods inherited from the
* superclasses.
*/
public CtMethod[] getMethods() {
return new CtMethod[0];
}
/**
* Returns the method with the given name and signature.
* The returned method may be declared in a super class.
* The method signature is represented by a character string
* called method descriptor,
* which is defined in the JVM specification.
*
* @param name method name
* @param desc method descriptor
* @see CtBehavior#getSignature()
* @see javassist.bytecode.Descriptor
*/
public CtMethod getMethod(String name, String desc)
throws NotFoundException
{
throw new NotFoundException(name);
}
/**
* Gets all methods declared in the class. The inherited methods
* are not included.
*
* @see javassist.CtMethod
*/
public CtMethod[] getDeclaredMethods() {
return new CtMethod[0];
}
/**
* Retrieves the method with the specified name and parameter types
* among the methods declared in the class.
*
* <p>Note: this method does not search the superclasses.
*
* @param name method name
* @param params parameter types
* @see javassist.CtMethod
*/
public CtMethod getDeclaredMethod(String name, CtClass[] params)
throws NotFoundException
{
throw new NotFoundException(name);
}
/**
* Retrieves the method with the specified name among the methods
* declared in the class. If there are multiple methods with
* the specified name, then this method returns one of them.
*
* <p>Note: this method does not search the superclasses.
*
* @see javassist.CtMethod
*/
public CtMethod getDeclaredMethod(String name) throws NotFoundException {
throw new NotFoundException(name);
}
/**
* Makes an empty class initializer (static constructor).
* If the class already includes a class initializer,
* this method returns it.
*
* @see #getClassInitializer()
*/
public CtConstructor makeClassInitializer()
throws CannotCompileException
{
throw new CannotCompileException("not a class");
}
/**
* Adds a constructor. To add a class initializer (static constructor),
* call <code>makeClassInitializer()</code>.
*
* @see #makeClassInitializer()
*/
public void addConstructor(CtConstructor c)
throws CannotCompileException
{
checkModify();
}
/**
* Removes a constructor declared in this class.
*
* @param c removed constructor.
* @throws NotFoundException if the constructor is not found.
*/
public void removeConstructor(CtConstructor c) throws NotFoundException {
checkModify();
}
/**
* Adds a method.
*/
public void addMethod(CtMethod m) throws CannotCompileException {
checkModify();
}
/**
* Removes a method declared in this class.
*
* @param m removed method.
* @throws NotFoundException if the method is not found.
*/
public void removeMethod(CtMethod m) throws NotFoundException {
checkModify();
}
/**
* Adds a field.
*
* <p>The <code>CtField</code> belonging to another
* <code>CtClass</code> cannot be directly added to this class.
* Only a field created for this class can be added.
*
* @see javassist.CtField#CtField(CtField,CtClass)
*/
public void addField(CtField f) throws CannotCompileException {
addField(f, (CtField.Initializer)null);
}
/**
* Adds a field with an initial value.
*
* <p>The <code>CtField</code> belonging to another
* <code>CtClass</code> cannot be directly added to this class.
* Only a field created for this class can be added.
*
* <p>The initial value is given as an expression written in Java.
* Any regular Java expression can be used for specifying the initial
* value. The followings are examples.
*
* <ul><pre>
* cc.addField(f, "0") // the initial value is 0.
* cc.addField(f, "i + 1") // i + 1.
* cc.addField(f, "new Point()"); // a Point object.
* </pre></ul>
*
* <p>Here, the type of variable <code>cc</code> is <code>CtClass</code>.
* The type of <code>f</code> is <code>CtField</code>.
*
* <p>Note: do not change the modifier of the field
* (in particular, do not add or remove <code>static</code>
* to/from the modifier)
* after it is added to the class by <code>addField()</code>.
*
* @param init an expression for the initial value.
*
* @see javassist.CtField.Initializer#byExpr(String)
* @see javassist.CtField#CtField(CtField,CtClass)
*/
public void addField(CtField f, String init)
throws CannotCompileException
{
checkModify();
}
/**
* Adds a field with an initial value.
*
* <p>The <code>CtField</code> belonging to another
* <code>CtClass</code> cannot be directly added to this class.
* Only a field created for this class can be added.
*
* <p>For example,
*
* <ul><pre>
* CtClass cc = ...;
* addField(new CtField(CtClass.intType, "i", cc),
* CtField.Initializer.constant(1));
* </pre></ul>
*
* <p>This code adds an <code>int</code> field named "i". The
* initial value of this field is 1.
*
* @param init specifies the initial value of the field.
*
* @see javassist.CtField#CtField(CtField,CtClass)
*/
public void addField(CtField f, CtField.Initializer init)
throws CannotCompileException
{
checkModify();
}
/**
* Removes a field declared in this class.
*
* @param f removed field.
* @throws NotFoundException if the field is not found.
*/
public void removeField(CtField f) throws NotFoundException {
checkModify();
}
/**
* Obtains an attribute with the given name.
* If that attribute is not found in the class file, this
* method returns null.
*
* <p>This is a convenient method mainly for obtaining
* a user-defined attribute. For dealing with attributes, see the
* <code>javassist.bytecode</code> package. For example, the following
* expression returns all the attributes of a class file.
*
* <ul><pre>
* getClassFile().getAttributes()
* </pre></ul>
*
* @param name attribute name
* @see javassist.bytecode.AttributeInfo
*/
public byte[] getAttribute(String name) {
return null;
}
/**
* Adds a named attribute.
* An arbitrary data (smaller than 64Kb) can be saved in the class
* file. Some attribute name are reserved by the JVM.
* The attributes with the non-reserved names are ignored when a
* class file is loaded into the JVM.
* If there is already an attribute with
* the same name, this method substitutes the new one for it.
*
* <p>This is a convenient method mainly for adding
* a user-defined attribute. For dealing with attributes, see the
* <code>javassist.bytecode</code> package. For example, the following
* expression adds an attribute <code>info</code> to a class file.
*
* <ul><pre>
* getClassFile().addAttribute(info)
* </pre></ul>
*
* @param name attribute name
* @param data attribute value
* @see javassist.bytecode.AttributeInfo
*/
public void setAttribute(String name, byte[] data) {
checkModify();
}
/**
* Applies the given converter to all methods and constructors
* declared in the class. This method calls <code>instrument()</code>
* on every <code>CtMethod</code> and <code>CtConstructor</code> object
* in the class.
*
* @param converter specifies how to modify.
*/
public void instrument(CodeConverter converter)
throws CannotCompileException
{
checkModify();
}
/**
* Modifies the bodies of all methods and constructors
* declared in the class. This method calls <code>instrument()</code>
* on every <code>CtMethod</code> and <code>CtConstructor</code> object
* in the class.
*
* @param editor specifies how to modify.
*/
public void instrument(ExprEditor editor)
throws CannotCompileException
{
checkModify();
}
/**
* Converts this class to a <code>java.lang.Class</code> object.
* Once this method is called, further modifications are not
* allowed any more.
* To load the class, this method uses the context class loader
* of the current thread. If the program is running on some application
* server, the context class loader might be inappropriate to load the
* class.
*
* <p>This method is provided for convenience. If you need more
* complex functionality, you should write your own class loader.
*
* <p>Note: this method calls <code>toClass()</code>
* in <code>ClassPool</code>.
*
* <p><b>Warining:</b> A Class object returned by this method may not
* work with a security manager or a signed jar file because a
* protection domain is not specified.
*
* @see #toClass(java.lang.ClassLoader,ProtectionDomain)
* @see ClassPool#toClass(CtClass)
*/
public Class toClass() throws CannotCompileException {
return getClassPool().toClass(this);
}
/**
* Converts this class to a <code>java.lang.Class</code> object.
* Once this method is called, further modifications are not allowed
* any more.
*
* <p>The class file represented by this <code>CtClass</code> is
* loaded by the given class loader to construct a
* <code>java.lang.Class</code> object. Since a private method
* on the class loader is invoked through the reflection API,
* the caller must have permissions to do that.
*
* <p>An easy way to obtain <code>ProtectionDomain</code> object is
* to call <code>getProtectionDomain()</code>
* in <code>java.lang.Class</code>. It returns the domain that
* the class belongs to.
*
* <p>This method is provided for convenience. If you need more
* complex functionality, you should write your own class loader.
*
* <p>Note: this method calls <code>toClass()</code>
* in <code>ClassPool</code>.
*
* @param loader the class loader used to load this class.
* If it is null, the class loader returned by
* {@link ClassPool#getClassLoader()} is used.
* @param domain the protection domain that the class belongs to.
* If it is null, the default domain created
* by <code>java.lang.ClassLoader</code> is used.
* @see ClassPool#toClass(CtClass,java.lang.ClassLoader)
* @since 3.3
*/
public Class toClass(ClassLoader loader, ProtectionDomain domain)
throws CannotCompileException
{
ClassPool cp = getClassPool();
if (loader == null)
loader = cp.getClassLoader();
return cp.toClass(this, loader, domain);
}
/**
* Converts this class to a <code>java.lang.Class</code> object.
*
* <p><b>Warining:</b> A Class object returned by this method may not
* work with a security manager or a signed jar file because a
* protection domain is not specified.
*
* @deprecated Replaced by {@link #toClass(ClassLoader,ProtectionDomain)}
*/
public final Class toClass(ClassLoader loader)
throws CannotCompileException
{
return getClassPool().toClass(this, loader);
}
/**
* Removes this <code>CtClass</code> object from the
* <code>ClassPool</code>.
* After this method is called, any method cannot be called on the
* removed <code>CtClass</code> object.
*
* <p>If <code>get()</code> in <code>ClassPool</code> is called
* with the name of the removed method,
* the <code>ClassPool</code> will read the class file again
* and constructs another <code>CtClass</code> object representing
* the same class.
*/
public void detach() {
ClassPool cp = getClassPool();
CtClass obj = cp.removeCached(getName());
if (obj != this)
cp.cacheCtClass(getName(), obj, false);
}
/**
* Disallows (or allows) automatically pruning this <code>CtClass</code>
* object.
*
* <p>
* Javassist can automatically prune a <code>CtClass</code> object
* when <code>toBytecode()</code> (or <code>toClass()</code>,
* <code>writeFile()</code>) is called.
* Since a <code>ClassPool</code> holds all instances of <code>CtClass</code>
* even after <code>toBytecode()</code> (or <code>toClass()</code>,
* <code>writeFile()</code>) is called, pruning may significantly
* save memory consumption.
*
* <p>If <code>ClassPool.doPruning</code> is true, the automatic pruning
* is on by default. Otherwise, it is off. The default value of
* <code>ClassPool.doPruning</code> is false.
*
* @param stop disallow pruning if true. Otherwise, allow.
* @return the previous status of pruning. true if pruning is already stopped.
*
* @see #detach()
* @see #prune()
* @see ClassPool#doPruning
*/
public boolean stopPruning(boolean stop) { return true; }
/**
* Discards unnecessary attributes, in particular,
* <code>CodeAttribute</code>s (method bodies) of the class,
* to minimize the memory footprint.
* After calling this method, the class is read only.
* It cannot be modified any more.
* Furthermore, <code>toBytecode()</code>,
* <code>writeFile()</code>, <code>toClass()</code>,
* or <code>instrument()</code> cannot be called.
* However, the method names and signatures in the class etc.
* are still accessible.
*
* <p><code>toBytecode()</code>, <code>writeFile()</code>, and
* <code>toClass()</code> internally call this method if
* automatic pruning is on.
*
* <p>According to some experiments, pruning does not really reduce
* memory consumption. Only about 20%. Since pruning takes time,
* it might not pay off. So the automatic pruning is off by default.
*
* @see #stopPruning(boolean)
* @see #detach()
* @see ClassPool#doPruning
*
* @see #toBytecode()
* @see #toClass()
* @see #writeFile()
* @see #instrument(CodeConverter)
* @see #instrument(ExprEditor)
*/
public void prune() {}
/* Called by get() in ClassPool.
* CtClassType overrides this method.
*/
void incGetCounter() {}
/**
* If this method is called, the class file will be
* rebuilt when it is finally generated by
* <code>toBytecode()</code> and <code>writeFile()</code>.
* For a performance reason, the symbol table of the
* class file may contain unused entries, for example,
* after a method or a filed is deleted.
* This method
* removes those unused entries. This removal will
* minimize the size of the class file.
*
* @since 3.8.1
*/
public void rebuildClassFile() {}
/**
* Converts this class to a class file.
* Once this method is called, further modifications are not
* possible any more.
*
* @return the contents of the class file.
*/
public byte[] toBytecode() throws IOException, CannotCompileException {
ByteArrayOutputStream barray = new ByteArrayOutputStream();
DataOutputStream out = new DataOutputStream(barray);
try {
toBytecode(out);
}
finally {
out.close();
}
return barray.toByteArray();
}
/**
* Writes a class file represented by this <code>CtClass</code>
* object in the current directory.
* Once this method is called, further modifications are not
* possible any more.
*
* @see #debugWriteFile()
*/
public void writeFile()
throws NotFoundException, IOException, CannotCompileException
{
writeFile(".");
}
/**
* Writes a class file represented by this <code>CtClass</code>
* object on a local disk.
* Once this method is called, further modifications are not
* possible any more.
*
* @param directoryName it must end without a directory separator.
* @see #debugWriteFile(String)
*/
public void writeFile(String directoryName)
throws CannotCompileException, IOException
{
String classname = getName();
String filename = directoryName + File.separatorChar
+ classname.replace('.', File.separatorChar) + ".class";
int pos = filename.lastIndexOf(File.separatorChar);
if (pos > 0) {
String dir = filename.substring(0, pos);
if (!dir.equals("."))
new File(dir).mkdirs();
}
DataOutputStream out
= new DataOutputStream(new BufferedOutputStream(
new DelayedFileOutputStream(filename)));
try {
toBytecode(out);
}
finally {
out.close();
}
}
/**
* Writes a class file as <code>writeFile()</code> does although this
* method does not prune or freeze the class after writing the class
* file. Note that, once <code>writeFile()</code> or <code>toBytecode()</code>
* is called, it cannot be called again since the class is pruned and frozen.
* This method would be useful for debugging.
*/
public void debugWriteFile() {
debugWriteFile(".");
}
/**
* Writes a class file as <code>writeFile()</code> does although this
* method does not prune or freeze the class after writing the class
* file. Note that, once <code>writeFile()</code> or <code>toBytecode()</code>
* is called, it cannot be called again since the class is pruned and frozen.
* This method would be useful for debugging.
*
* @param directoryName it must end without a directory separator.
*/
public void debugWriteFile(String directoryName) {
try {
boolean p = stopPruning(true);
writeFile(directoryName);
defrost();
stopPruning(p);
}
catch (Exception e) {
throw new RuntimeException(e);
}
}
static class DelayedFileOutputStream extends OutputStream {
private FileOutputStream file;
private String filename;
DelayedFileOutputStream(String name) {
file = null;
filename = name;
}
private void init() throws IOException {
if (file == null)
file = new FileOutputStream(filename);
}
public void write(int b) throws IOException {
init();
file.write(b);
}
public void write(byte[] b) throws IOException {
init();
file.write(b);
}
public void write(byte[] b, int off, int len) throws IOException {
init();
file.write(b, off, len);
}
public void flush() throws IOException {
init();
file.flush();
}
public void close() throws IOException {
init();
file.close();
}
}
/**
* Converts this class to a class file.
* Once this method is called, further modifications are not
* possible any more.
*
* <p>This method dose not close the output stream in the end.
*
* @param out the output stream that a class file is written to.
*/
public void toBytecode(DataOutputStream out)
throws CannotCompileException, IOException
{
throw new CannotCompileException("not a class");
}
/**
* Makes a unique member name. This method guarantees that
* the returned name is not used as a prefix of any methods
* or fields visible in this class.
* If the returned name is XYZ, then any method or field names
* in this class do not start with XYZ.
*
* @param prefix the prefix of the member name.
*/
public String makeUniqueName(String prefix) {
throw new RuntimeException("not available in " + getName());
}
/* Invoked from ClassPool#compress().
* This method is overridden by CtClassType.
*/
void compress() {}
}
|