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LinuxControllers.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;

/** helper methods for Linux specific Controllers
* @author elias
* @version 1.0
*/
00047 final class LinuxControllers {
      private final static LinuxEvent linux_event = new LinuxEvent();

      /* Declared synchronized to protect linux_event */
      public final static synchronized boolean getNextDeviceEvent(Event event, LinuxEventDevice device) throws IOException {
            while (device.getNextEvent(linux_event)) {
                  LinuxAxisDescriptor descriptor = linux_event.getDescriptor();
                  LinuxComponent component = device.mapDescriptor(descriptor);
                  if (component != null) {
                        float value = component.convertValue(linux_event.getValue(), descriptor);
                        event.set(component, value, linux_event.getNanos());
                        return true;
                  }
            }
            return false;
      }

      private final static LinuxAbsInfo abs_info = new LinuxAbsInfo();

      /* Declared synchronized to protect abs_info */
      public final static synchronized float poll(LinuxEventComponent event_component) throws IOException {
            int native_type = event_component.getDescriptor().getType();
            switch (native_type) {
                  case NativeDefinitions.EV_KEY:
                        int native_code = event_component.getDescriptor().getCode();
                        float state = event_component.getDevice().isKeySet(native_code) ? 1f : 0f;
                        return state;
                  case NativeDefinitions.EV_ABS:
                        event_component.getAbsInfo(abs_info);
                        return abs_info.getValue();
                  default:
                        throw new RuntimeException("Unkown native_type: " + native_type);
            }
      }
}

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