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
|
/*
* Javassist, a Java-bytecode translator toolkit.
* Copyright (C) 1999-2004 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.*;
import javassist.bytecode.*;
import java.util.Collection;
import javassist.expr.ExprEditor;
import java.net.URL;
// Subclasses of CtClass: 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 = "3.0 alpha 1";
/**
* 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) 1999-2004 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("[");
buf.append(Modifier.toString(getModifiers()));
buf.append(' ');
buf.append(getName());
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.
*/
abstract protected void extendToString(StringBuffer buffer);
/**
* 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();
}
/**
* Undocumented method. Do not use; internal-use only.
*/
public ClassFile getClassFile2() { 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()
*/
public boolean isFrozen() { return true; }
void freeze() {}
void checkModify() throws RuntimeException {
if (isFrozen())
throw new RuntimeException("the class is frozen");
// isModified() must return true after this method is invoked.
}
/**
* Defrosts the class so that the class can be modified again.
*
* 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.
*
* @see #isFrozen()
*/
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>.
*/
public 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.renameClass(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;
}
/**
* Returns the modifiers for this class, encoded in an integer.
* For decoding, use <code>javassist.Modifier</code>.
*
* @see Modifier
*/
public int getModifiers() {
return 0;
}
/**
* Sets the modifiers.
*
* @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.
*
* <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.
*/
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();
}
/**
* Returns an array containing <code>CtField</code> objects
* representing all the public fields of the class.
* That array includes public 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 {
throw new NotFoundException(name);
}
/**
* @return null if the specified field is not found.
*/
CtField getField2(String name) { 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 superclasses.
*/
public CtField getDeclaredField(String name) 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 public 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 a 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 public methods of the class.
* That array includes public 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 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();
}
/**
* Adds a method.
*/
public void addMethod(CtMethod m) throws CannotCompileException {
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>.
*
* @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();
}
/**
* Obtains an attribute with the given name.
* If that attribute is not found in the class file, this
* method returns null.
*
* @param name attribute name
*/
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.
*
* @param name attribute name
* @param data attribute value
*/
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
* possible any more.
*
* <p>This method is provided for convenience. If you need more
* complex functionality, you should write your own class loader.
*
* <p>To load a class file, this method uses an internal class loader,
* which is an instance of <code>ClassPool.SimpleLoader</code>.
* Thus, that class file is not loaded by the system class loader,
* which should have loaded this <code>CtClass</code> class.
* The internal class loader
* loads only the classes explicitly specified by this method
* <code>toClass()</code>. The other classes are loaded
* by the parent class loader (usually the sytem class loader)
* by delegation.
*
* <p>For example,
*
* <ul><pre>class Line { Point p1, p2; }</pre></ul>
*
* <p>If the class <code>Line</code> is loaded by the internal class
* loader and the class <code>Point</code> has not been loaded yet,
* then the class <code>Point</code> that the class <code>Line</code>
* refers to is loaded by the parent class loader. There is no
* chance of modifying the definition of <code>Point</code> with
* Javassist.
*
* <p>The internal class loader is shared among all the instances
* of <code>ClassPool</code>.
*
* @return the <code>Class</code> object representing the loaded class.
* @see CtClass#forName(String)
* @see ClassPool.SimpleClassLoader
* @see Loader
*/
public Class toClass()
throws NotFoundException, IOException, CannotCompileException
{
return ClassPool.loadClass(getName(), toBytecode());
}
/**
* Returns a <code>java.lang.Class</code> object that has been loaded
* by <code>toClass()</code>. Such an object cannot be
* obtained by <code>java.lang.Class.forName()</code> because it has
* been loaded by an internal class loader of Javassist.
*
* @see CtClass#toClass()
* @see ClassPool.SimpleClassLoader
*/
public static Class forName(String name) throws ClassNotFoundException {
return ClassPool.forName(name);
}
/**
* 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 NotFoundException, 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.
*/
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.
*/
public void writeFile(String directoryName)
throws NotFoundException, 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();
}
}
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");
}
}
|