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LinuxForceFeedbackEffect.java

/**
 * Copyright (C) 2003 Jeremy Booth (jeremy@newdawnsoftware.com)
 *
 * Redistribution and use in source and binary forms, with or without 
 * modification, are permitted provided that the following conditions are met:
 *
 * Redistributions of source code must retain the above copyright notice, this 
 * list of conditions and the following disclaimer. Redistributions in binary 
 * form must reproduce the above copyright notice, this list of conditions and 
 * the following disclaimer in the documentation and/or other materials provided
 * with the distribution. 
 * The name of the author may not be used to endorse or promote products derived
 * from this software without specific prior written permission. 
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF 
 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO 
 * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; 
 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 
 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR 
 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF 
 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE
 */
package net.java.games.input;

import java.io.IOException;

/**
 * @author elias
 */
00033 abstract class LinuxForceFeedbackEffect implements Rumbler {
      private final LinuxEventDevice device;
      private final int ff_id;
      private final WriteTask write_task = new WriteTask();
      private final UploadTask upload_task = new UploadTask();
      
    public LinuxForceFeedbackEffect(LinuxEventDevice device) throws IOException {
            this.device = device;
            this.ff_id = upload_task.doUpload(-1, 0);
    }

      protected abstract int upload(int id, float intensity) throws IOException;
      
      protected final LinuxEventDevice getDevice() {
            return device;
      }
      
00050       public synchronized final void rumble(float intensity) {
            try {
                  if (intensity > 0) {
                        upload_task.doUpload(ff_id, intensity);
                        write_task.write(1);
                  } else {
                        write_task.write(0);
                  }
            } catch (IOException e) {
                  LinuxEnvironmentPlugin.logln("Failed to rumble: " + e);
            }
      }

      /*
       * Erase doesn't seem to be implemented on Logitech joysticks,
       * so we'll rely on the kernel cleaning up on device close
       */
/*
      public final void erase() throws IOException {
            device.eraseEffect(ff_id);
      }
*/
00072       public final String getAxisName() {
            return null;
      }

00076       public final Component.Identifier getAxisIdentifier() {
            return null;
      }

      private final class UploadTask extends LinuxDeviceTask {
            private int id;
            private float intensity;

            public final int doUpload(int id, float intensity) throws IOException {
                  this.id = id;
                  this.intensity = intensity;
                  LinuxEnvironmentPlugin.execute(this);
                  return this.id;
            }

            protected final Object execute() throws IOException {
                  this.id = upload(id, intensity);
                  return null;
            }
      }

      private final class WriteTask extends LinuxDeviceTask {
            private int value;

            public final void write(int value) throws IOException {
                  this.value = value;
                  LinuxEnvironmentPlugin.execute(this);
            }

            protected final Object execute() throws IOException {
                  device.writeEvent(NativeDefinitions.EV_FF, ff_id, value);
                  return null;
            }
      }
}

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