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1 package groovy.lang;
2
3 import java.io.IOException  ;
4 import java.io.PrintWriter ;
5 import java.io.Writer ;
6
7 public class TracingInterceptor implements Interceptor {
8
9 protected Writer writer = new PrintWriter (System.out);
10
11 public Writer getWriter() {
12 return writer;
13 }
14
15 public void setWriter(Writer writer) {
16 this.writer = writer;
17 }
18
19 public Object beforeInvoke(Object object, String methodName, Object [] arguments) {
20 write(object, methodName, arguments, "before");
21 return null;
22 }
23
24 public Object afterInvoke(Object object, String methodName, Object [] arguments, Object result) {
25 write(object, methodName, arguments, "after");
26 return result;
27 }
28
29 public boolean doInvoke() {
30 return true;
31 }
32
33 protected void write(Object object, String methodName, Object [] arguments, final String origin) {
34 try {
35 writer.write("Interceptor ");
36 writer.write(origin);
37 writer.write(" ");
38 Class theClass = object instanceof Class ? (Class ) object: object.getClass();
39 writeInfo(theClass, methodName, arguments);
40 writer.write("\n");
41 writer.flush();
42 } catch (IOException e) {
43 e.printStackTrace();
44 }
45 }
46
47 protected void writeInfo(final Class aClass, String methodName, Object [] arguments) throws IOException {
48 writer.write(aClass.getName());
49 writer.write(".");
50 writer.write(methodName);
51 writer.write("(");
52 for (int i = 0; i < arguments.length; i++) {
53 if (i > 0) writer.write(", ");
54 Object argument = arguments[i];
55 writer.write(argument.getClass().getName());
56 }
57 writer.write(")");
58 }
59 }
60 |
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Java API By Example, From Geeks To Geeks.