public synchronized boolean waitForChange(long timeout) throws CardException {
// System.out.println("enter WaitforChange");
// Thread.dumpStack();
if (timeout < 0) {
throw new IllegalArgumentException("Timeout must not be negative: " + timeout);
}
if (stateMap == null) {
// We need to initialize the state database.
// Do that with a recursive call, which will return immediately
// because we pass SCARD_STATE_UNAWARE.
// After that, proceed with the real call.
stateMap = new HashMap<String, ReaderState>();
waitForChange(0);
}
if (timeout == 0) {
timeout = TIMEOUT_INFINITE;
}
try {
String[] readerNames = SCardListReaders(contextId);
int n = readerNames.length;
if (n == 0) {
throw new IllegalStateException("No terminals available");
}
int[] status = new int[n];
ReaderState[] readerStates = new ReaderState[n];
for (int i = 0; i < readerNames.length; i++) {
String name = readerNames[i];
ReaderState state = stateMap.get(name);
if (state == null) {
state = new ReaderState();
}
readerStates[i] = state;
status[i] = state.get();
}
status = SCardGetStatusChange(contextId, timeout, status, readerNames);
stateMap.clear(); // remove any readers that are no longer available
for (int i = 0; i < n; i++) {
ReaderState state = readerStates[i];
state.update(status[i]);
stateMap.put(readerNames[i], state);
}
// System.out.println("exit WaitforChange");
return true;
} catch (PCSCException e) {
if (e.code == SCARD_E_TIMEOUT) {
// System.out.println("exit WaitforChange");
return false;
} else {
throw new CardException("waitForChange() failed", e);
}
}
}