| Methods Summary |
|---|
| protected java.lang.Class | findClass(java.lang.String name)
// First check if we have permission to access the package.
// You could remove these 7 lines to skip the optional step 4.
SecurityManager sm = System.getSecurityManager();
if (sm != null) {
int i = name.lastIndexOf('.");
if (i != -1) {
sm.checkPackageDefinition(name.substring(0, i));
}
}
// Now read in the bytes and define the class
try {
return (Class)
AccessController.doPrivileged(
new PrivilegedExceptionAction() {
public Object run() throws ClassNotFoundException {
byte[] buf = null;
try {
buf = readClassBytes(name);
} catch (Exception e) {
throw new ClassNotFoundException(name, e);
}
CodeSource cs = getCodeSource(name);
Class c = defineClass(name, buf,
0, buf.length, cs);
System.out.println("defining class " + c);
return c;
}
}
);
} catch (java.security.PrivilegedActionException pae) {
throw (ClassNotFoundException) pae.getException();
}
|
| protected java.security.CodeSource | getCodeSource(java.lang.String name)
try {
return new CodeSource(new URL("file", "localhost", name), null);
} catch (MalformedURLException mue) {
mue.printStackTrace();
}
return null;
|
| protected java.security.PermissionCollection | getPermissions(java.security.CodeSource codesource)
PermissionCollection pc = new Permissions();
pc.add(new RuntimePermission("exitVM"));
return pc;
|
| public final synchronized java.lang.Class | loadClass(java.lang.String name, boolean resolve)
// First check if we have permission to access the package.
SecurityManager sm = System.getSecurityManager();
if (sm != null) {
int i = name.lastIndexOf('.");
if (i != -1) {
sm.checkPackageAccess(name.substring(0, i));
}
}
System.out.println("loading class " + name);
return super.loadClass(name, resolve);
|
| protected byte[] | readClassBytes(java.lang.String name)
try {
// This is the standard technique to read a class
// from the file system; you must convert the . in
// the package name to the directory structure from
// which you're reading.
name = name.replace('.", File.separatorChar);
// We read classes from the directoy foo (plus the
// additional directories required by the package name).
DataInputStream dis = new DataInputStream(
new FileInputStream("foo" +
File.separatorChar + name + ".class"));
byte[] buf = new byte[dis.available()];
dis.readFully(buf);
return buf;
} catch (IOException ioe) {
ioe.printStackTrace();
return null;
}
|
