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OSXHIDElement.java

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package net.java.games.input;

import java.io.IOException;

/** Represents an OSX HID Element
* @author elias
* @author gregorypierce
* @version 1.0
*/
00048 final class OSXHIDElement {
      private final OSXHIDDevice device;
      private final UsagePair usage_pair;
      private final long element_cookie;
      private final ElementType element_type;
      private final int min;
      private final int max;
      private final Component.Identifier identifier;
      private final boolean is_relative;
      
      public OSXHIDElement(OSXHIDDevice device, UsagePair usage_pair, long element_cookie, ElementType element_type, int min, int max, boolean is_relative) {
            this.device = device;
            this.usage_pair = usage_pair;
            this.element_cookie = element_cookie;
            this.element_type = element_type;
            this.min = min;
            this.max = max;
            this.identifier = computeIdentifier();
            this.is_relative = is_relative;
      }

      private final Component.Identifier computeIdentifier() {
            if (usage_pair.getUsagePage() == UsagePage.GENERIC_DESKTOP) {
                  return ((GenericDesktopUsage)usage_pair.getUsage()).getIdentifier();
            } else if (usage_pair.getUsagePage() == UsagePage.BUTTON) { 
                  return ((ButtonUsage)usage_pair.getUsage()).getIdentifier();
            } else if (usage_pair.getUsagePage() == UsagePage.KEYBOARD_OR_KEYPAD) {
                  return ((KeyboardUsage)usage_pair.getUsage()).getIdentifier();
            } else
                  return null;
      }

      final Component.Identifier getIdentifier() {
            return identifier;
      }

      final long getCookie() {
            return element_cookie;
      }

      final ElementType getType() {
            return element_type;
      }

      final boolean isRelative() {
            return is_relative && identifier instanceof Component.Identifier.Axis;
      }

      final boolean isAnalog() {
            return identifier instanceof Component.Identifier.Axis && identifier != Component.Identifier.Axis.POV;
      }

      private UsagePair getUsagePair() {
            return usage_pair;
      }
      
      final void getElementValue(OSXEvent event) throws IOException {
            device.getElementValue(element_cookie, event);
      }

      final float convertValue(float value) {
            if (identifier == Component.Identifier.Axis.POV) {
                        switch ((int)value) {
                              case 0:
                                    return Component.POV.UP;
                              case 1:
                                    return Component.POV.UP_RIGHT;
                              case 2:
                                    return Component.POV.RIGHT;
                              case 3:
                                    return Component.POV.DOWN_RIGHT;
                              case 4:
                                    return Component.POV.DOWN;
                              case 5:
                                    return Component.POV.DOWN_LEFT;
                              case 6:
                                    return Component.POV.LEFT;
                              case 7:
                                    return Component.POV.UP_LEFT;
                              case 8:
                                    return Component.POV.OFF;
                              default:
                                    return Component.POV.OFF;
                        }
            } else if (identifier instanceof Component.Identifier.Axis && !is_relative) {
                  if (min == max)
                        return 0;
                  else if (value > max)
                        value = max;
                  else if (value < min)
                        value = min;
                  return 2*(value - min)/(max - min) - 1;
            } else
                  return value;
      }
}

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