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WinTabEnvironmentPlugin.java

/**
 * Copyright (C) 2006 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.File;
import java.security.AccessController;
import java.security.PrivilegedAction;
import java.util.ArrayList;
import java.util.List;

import net.java.games.util.plugins.Plugin;

public class WinTabEnvironmentPlugin extends ControllerEnvironment implements Plugin {
      private static boolean supported = false;
      
      /**
       * Static utility method for loading native libraries.
       * It will try to load from either the path given by
       * the net.java.games.input.librarypath property
       * or through System.loadLibrary().
       * 
       */
      static void loadLibrary(final String lib_name) {
            AccessController.doPrivileged(
                        new PrivilegedAction() {
                              public final Object run() {
                                  try {
                                    String lib_path = System.getProperty("net.java.games.input.librarypath");
                                    if (lib_path != null)
                                          System.load(lib_path + File.separator + System.mapLibraryName(lib_name));
                                    else
                                          System.loadLibrary(lib_name);
                                  } catch (UnsatisfiedLinkError e) {
                                      e.printStackTrace();
                                      supported = false;
                                  }
                                    return null;
                              }
                        });
      }
    
      static String getPrivilegedProperty(final String property) {
             return (String)AccessController.doPrivileged(new PrivilegedAction() {
                      public Object run() {
                          return System.getProperty(property);
                      }
                  });
            }
            

      static String getPrivilegedProperty(final String property, final String default_value) {
       return (String)AccessController.doPrivileged(new PrivilegedAction() {
                public Object run() {
                    return System.getProperty(property, default_value);
                }
            });
      }
            
    static {
      String osName = getPrivilegedProperty("os.name", "").trim();
      if(osName.startsWith("Windows")) {
            supported = true;
            loadLibrary("jinput-wintab");
      }
      }

      private final Controller[] controllers;
      private final List active_devices = new ArrayList();
      private final WinTabContext winTabContext;

      /** Creates new DirectInputEnvironment */
      public WinTabEnvironmentPlugin() {
            if(isSupported()) {
                  DummyWindow window = null;
                  WinTabContext winTabContext = null;
                  Controller[] controllers = new Controller[]{};
                  try {
                        window = new DummyWindow();
                        winTabContext = new WinTabContext(window);
                        try {
                              winTabContext.open();
                              controllers = winTabContext.getControllers();
                        } catch (Exception e) {
                              window.destroy();
                              throw e;
                        }
                  } catch (Exception e) {
                        logln("Failed to enumerate devices: " + e.getMessage());
                        e.printStackTrace();
                  }
                  this.controllers = controllers;
                  this.winTabContext = winTabContext;
                  AccessController.doPrivileged(
                              new PrivilegedAction() {
                                    public final Object run() {
                                          Runtime.getRuntime().addShutdownHook(new ShutdownHook());
                                          return null;
                                    }
                              });
            } else {
                  winTabContext = null;
                  controllers = new Controller[]{};
            }
      }
      
      public boolean isSupported() {
            return supported;
      }

      public Controller[] getControllers() {
            return controllers;
      }

      private final class ShutdownHook extends Thread {
            public final void run() {
                  /* Release the devices to kill off active force feedback effects */
                  for (int i = 0; i < active_devices.size(); i++) {
                        // TODO free the devices
                  }
                  //Close the context
                  winTabContext.close();
                  /* We won't release the window since it is
                   * owned by the thread that created the environment.
                   */
            }
      }
}

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