private void commandFrame(StringTokenizer t) throws NoSessionException {
ThreadReference current = context.getCurrentThread();
if (current == null) {
env.failure("No current thread.");
return;
}
if (!t.hasMoreTokens()) {
env.error("usage: frame <frame-index>");
return;
}
String idToken = t.nextToken();
int n;
try {
n = Integer.valueOf(idToken).intValue();
} catch (NumberFormatException e) {
n = 0;
}
if (n <= 0) {
env.error("use positive frame index");
return;
}
try {
int delta = context.setCurrentFrameIndex(current, n);
if (delta == 0) {
env.notice("Frame unchanged.");
} else if (delta < 0) {
env.notice("Moved up " + -delta + " frames.");
} else {
env.notice("Moved down " + delta + " frames.");
}
} catch (VMNotInterruptedException e) {
env.failure("Target VM must be in interrupted state.");
}
}
