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RawInputEventQueue.java

/*
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 * Copyright 2002 Sun Microsystems, Inc. All rights reserved.
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package net.java.games.input;

import java.io.IOException;
import java.util.List;
import java.util.ArrayList;
import java.util.Set;
import java.util.HashSet;

/** Java wrapper of RAWDEVICELIST
 * @author elias
 * @version 1.0
 */
00051 final class RawInputEventQueue {
      private final Object monitor = new Object();

      private List devices;
      
      public final void start(List devices) throws IOException {
            this.devices = devices;
            QueueThread queue = new QueueThread();
            synchronized (monitor) {
                  queue.start();
                  // wait for initialization
                  while (!queue.isInitialized()) {
                        try {
                              monitor.wait();
                        } catch (InterruptedException e) {}
                  }
            }
            if (queue.getException() != null)
                  throw queue.getException();
      }

      private final RawDevice lookupDevice(long handle) {
            for (int i = 0; i < devices.size(); i++) {
                  RawDevice device = (RawDevice)devices.get(i);
                  if (device.getHandle() == handle)
                        return device;
            }
            return null;
      }

      /* Event methods called back from native code in nPoll() */
      private final void addMouseEvent(long handle, long millis, int flags, int button_flags, int button_data, long raw_buttons, long last_x, long last_y, long extra_information) {
            RawDevice device = lookupDevice(handle);
            if (device == null)
                  return;
            device.addMouseEvent(millis, flags, button_flags, button_data, raw_buttons, last_x, last_y, extra_information);
      }

      private final void addKeyboardEvent(long handle, long millis, int make_code, int flags, int vkey, int message, long extra_information) {
            RawDevice device = lookupDevice(handle);
            if (device == null)
                  return;
            device.addKeyboardEvent(millis, make_code, flags, vkey, message, extra_information);
      }

      private final void poll(DummyWindow window) throws IOException {
            nPoll(window.getHwnd());
      }
      private final native void nPoll(long hwnd_handle) throws IOException;

      private final static void registerDevices(DummyWindow window, RawDeviceInfo[] devices) throws IOException {
            nRegisterDevices(0, window.getHwnd(), devices);
      }
      private final static native void nRegisterDevices(int flags, long hwnd_addr, RawDeviceInfo[] devices) throws IOException;

      private final class QueueThread extends Thread {
            private boolean initialized;
            private DummyWindow window;
            private IOException exception;

            public QueueThread() {
                  setDaemon(true);
            }

            public final boolean isInitialized() {
                  return initialized;
            }

            public final IOException getException() {
                  return exception;
            }

            public final void run() {
                  // We have to create the window in the (private) queue thread
                  try {
                        window = new DummyWindow();
                  } catch (IOException e) {
                        exception = e;
                  }
                  initialized = true;
                  synchronized (monitor) {
                        monitor.notify();
                  }
                  if (exception != null)
                        return;
                  Set active_infos = new HashSet();
                  try {
                        for (int i = 0; i < devices.size(); i++) {
                              RawDevice device = (RawDevice)devices.get(i);
                              active_infos.add(device.getInfo());
                        }
                        RawDeviceInfo[] active_infos_array = new RawDeviceInfo[active_infos.size()];
                        active_infos.toArray(active_infos_array);
                        try {
                              registerDevices(window, active_infos_array);
                              while (!isInterrupted()) {
                                    poll(window);
                              }
                        } finally {
                              window.destroy();
                        }
                  } catch (IOException e) {
                        exception = e;
                  }
            }
      }
}

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