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RawKeyboard.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.lang.reflect.Field;
import java.lang.reflect.Modifier;

/**
* @author elias
* @version 1.0
*/
00052 final class RawKeyboard extends Keyboard {
      private final RawKeyboardEvent raw_event = new RawKeyboardEvent();
      private final RawDevice device;
      
      protected RawKeyboard(String name, RawDevice device, Controller[] children, Rumbler[] rumblers) throws IOException {
            super(name, createKeyboardComponents(device), children, rumblers);
            this.device = device;
      }

      private final static Component[] createKeyboardComponents(RawDevice device) {
            List components = new ArrayList();
            Field[] vkey_fields = RawIdentifierMap.class.getFields();
            for (int i = 0; i < vkey_fields.length; i++) {
                  Field vkey_field = vkey_fields[i];
                  try {
                        if (Modifier.isStatic(vkey_field.getModifiers()) && vkey_field.getType() == int.class) {
                              int vkey_code = vkey_field.getInt(null);
                              Component.Identifier.Key key_id = RawIdentifierMap.mapVKey(vkey_code);
                              if (key_id != Component.Identifier.Key.UNKNOWN)
                                    components.add(new Key(device, vkey_code, key_id));
                        }
                  } catch (IllegalAccessException e) {
                        throw new RuntimeException(e);
                  }
            }
            return (Component[])components.toArray(new Component[]{});
      }

      protected final synchronized boolean getNextDeviceEvent(Event event) throws IOException {
            while (true) {
                  if (!device.getNextKeyboardEvent(raw_event))
                        return false;
                  int vkey = raw_event.getVKey();
                  Component.Identifier.Key key_id = RawIdentifierMap.mapVKey(vkey);
                  Component key = getComponent(key_id);
                  if (key == null)
                        continue;
                  int message = raw_event.getMessage();
                  if (message == RawDevice.WM_KEYDOWN || message == RawDevice.WM_SYSKEYDOWN) {
                        event.set(key, 1, raw_event.getNanos());
                        return true;
                  } else if (message == RawDevice.WM_KEYUP || message == RawDevice.WM_SYSKEYUP) {
                        event.set(key, 0, raw_event.getNanos());
                        return true;
                  }
            }
      }

      public final void pollDevice() throws IOException {
            device.pollKeyboard();
      }

00104       protected final void setDeviceEventQueueSize(int size) throws IOException {
            device.setBufferSize(size);
      }

      final static class Key extends AbstractComponent {
            private final RawDevice device;
            private final int vkey_code;
            
            public Key(RawDevice device, int vkey_code, Component.Identifier.Key key_id) {
                  super(key_id.getName(), key_id);
                  this.device = device;
                  this.vkey_code = vkey_code;
            }

            protected final float poll() throws IOException {
                  return device.isKeyDown(vkey_code) ? 1f : 0f;
            }

            public final boolean isAnalog() {
                  return false;
            }

            public final boolean isRelative() {
                  return false;
            } 
      }
}

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