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IDirectInputEffect.java

/*
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 * Copyright 2002 Sun Microsystems, Inc. All rights reserved.
 * SUN PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
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package net.java.games.input;

import java.io.IOException;

/** Java wrapper for IDirectInputEffect
 * @author elias
 * @version 1.0
 */
00047 final class IDirectInputEffect implements Rumbler {
      private final long address;
      private final DIEffectInfo info;
      private boolean released;

      public IDirectInputEffect(long address, DIEffectInfo info) {
            this.address = address;
            this.info = info;
      }

00057       public final synchronized void rumble(float intensity) {
            try {
                  checkReleased();
                  if (intensity > 0) {
                        int int_gain = (int)Math.round(intensity*IDirectInputDevice.DI_FFNOMINALMAX);
                        setGain(int_gain);
                        start(1, 0);
                  } else
                        stop();
            } catch (IOException e) {
                  DirectInputEnvironmentPlugin.logln("Failed to set rumbler gain: " + e.getMessage());
            }
      }

00071       public final Component.Identifier getAxisIdentifier() {
            return null;
      }

00075       public final String getAxisName() {
            return null;
      }

      public final synchronized void release() {
            if (!released) {
                  released = true;
                  nRelease(address);
            }
      }
      private final static native void nRelease(long address);

      private final void checkReleased() throws IOException {
            if (released)
                  throw new IOException();
      }

      private final void setGain(int gain) throws IOException {
            int res = nSetGain(address, gain);
            if (res != IDirectInputDevice.DI_DOWNLOADSKIPPED &&
                  res != IDirectInputDevice.DI_EFFECTRESTARTED &&
                  res != IDirectInputDevice.DI_OK &&
                  res != IDirectInputDevice.DI_TRUNCATED &&
                  res != IDirectInputDevice.DI_TRUNCATEDANDRESTARTED) {
                  throw new IOException("Failed to set effect gain (0x" + Integer.toHexString(res) + ")");
            }
      }
      private final static native int nSetGain(long address, int gain);

      private final void start(int iterations, int flags) throws IOException {
            int res = nStart(address, iterations, flags);
            if (res != IDirectInputDevice.DI_OK)
                  throw new IOException("Failed to start effect (0x" + Integer.toHexString(res) + ")");
      }
      private final static native int nStart(long address, int iterations, int flags);
      
      private final void stop() throws IOException {
            int res = nStop(address);
            if (res != IDirectInputDevice.DI_OK)
                  throw new IOException("Failed to stop effect (0x" + Integer.toHexString(res) + ")");
      }
      private final static native int nStop(long address);

      protected void finalize() {
            release();
      }
}

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