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1 package samples;
2 import net.sf.cglib.proxy.*;
3 import java.util.*;
4
8 public class Trace implements MethodInterceptor {
9
10 int ident = 1;
11 static Trace callback = new Trace();
12
13
14 private Trace() {
15 }
16
17 public static Object  newInstance( Class clazz ){
18 try{
19 Enhancer e = new Enhancer();
20 e.setSuperclass(clazz);
21 e.setCallback(callback);
22 return e.create();
23 }catch( Throwable e ){
24 e.printStackTrace();
25 throw new Error (e.getMessage());
26 }
27
28 }
29
32 public static void main(String [] args) {
33 List list = (List)newInstance(Vector.class);
34 Object value = "TEST";
35 list.add(value);
36 list.contains(value);
37 try{
38 list.set(2, "ArrayIndexOutOfBounds" );
39 }catch( ArrayIndexOutOfBoundsException ignore ){
40
41 }
42 list.add(value + "1");
43 list.add(value + "2");
44 list.toString();
45 list.equals(list);
46 list.set( 0, null );
47 list.toString();
48 list.add(list);
49 list.get(1);
50 list.toArray();
51 list.remove(list);
52 list.remove("");
53 list.containsAll(list);
54 list.lastIndexOf(value);
55 }
56
57
58 public Object intercept(Object obj, java.lang.reflect.Method method, Object [] args,
59 MethodProxy proxy) throws Throwable {
60 printIdent(ident);
61 System.out.println( method );
62 for( int i = 0; i < args.length; i++ ){
63 printIdent(ident);
64 System.out.print( "arg" + (i + 1) + ": ");
65 if( obj == args[i])
66 System.out.println("this");
67 else
68 System.out.println(args[i]);
69 }
70 ident++;
71
72 Object retValFromSuper = null;
73 try {
74 retValFromSuper = proxy.invokeSuper(obj, args);
75 ident--;
76 } catch (Throwable t) {
77 ident--;
78 printIdent(ident);
79 System.out.println("throw " + t );
80 System.out.println();
81 throw t.fillInStackTrace();
82 }
83
84 printIdent(ident);
85 System.out.print("return " );
86 if( obj == retValFromSuper)
87 System.out.println("this");
88 else System.out.println(retValFromSuper);
89
90 if(ident == 1)
91 System.out.println();
92
93 return retValFromSuper;
94 }
95
96 void printIdent( int ident ){
97
98
99 while( --ident > 0 ){
100 System.out.print(".......");
101 }
102 System.out.print(" ");
103 }
104
105 }
106 |
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Java API By Example, From Geeks To Geeks.