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1 package org.hansel;
2
3 import java.io.ByteArrayOutputStream  ;
4 import java.io.InputStream ;
5 import java.io.IOException ;
6 import java.util.MissingResourceException ;
7
8 public class ProbeTableClassLoader extends ClassLoader {
9 private Class probeTable;
10
11 public ProbeTableClassLoader(ClassLoader parent) {
12 super(parent);
13 probeTable = createClass(ProbeTable.class.getName());
14 }
15
16 public Class loadClass(String name) throws ClassNotFoundException {
17 if (ProbeTable.class.getName().equals(name)) {
18 return probeTable;
19 }
20
21 return super.loadClass(name);
22 }
23
24 public Class getProbeTable() {
25 return probeTable;
26 }
27
28 private byte[] ressourceToByteArray(String ressourceName,
29 String classname) {
30 InputStream is = getClass().getClassLoader()
31 .getResourceAsStream(ressourceName);
32
33 if (is == null) {
34 throw new MissingResourceException ("Cannot find " +
35 classname + ".",
36 ProbeTable.class.getName(),
37 ressourceName);
38 }
39
40 ByteArrayOutputStream baos = new ByteArrayOutputStream ();
41 byte[] data = new byte[1024];
42
43 try {
44 int count = is.read(data);
45 while (count != -1) {
46 baos.write(data, 0, count);
47 count = is.read(data);
48 }
49 } catch (IOException e) {
50 throw new MissingResourceException ("Cannot read class"
51 + e.getMessage(),
52 classname,
53 ressourceName);
54 }
55
56 return baos.toByteArray();
57 }
58
59 private Class createClass(String classname) {
60 String ressourceName = classname.replace('.', '/') + ".class";
61 byte[] classdata = ressourceToByteArray(ressourceName, classname);
62
63 return defineClass(classname,
64 classdata,
65 0 , classdata.length);
66 }
67 }
68 |
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