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net_java_games_input_OSXHIDDeviceIterator.c

/*
 * %W% %E%
 *
 * Copyright 2002 Sun Microsystems, Inc. All rights reserved.
 * SUN PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
 */
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* Copyright (c) 2003 Sun Microsystems, Inc.  All Rights Reserved.
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* modification, are permitted provided that the following conditions are met:
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#include <IOKit/IOTypes.h>
#include <IOKit/IOKitLib.h>
#include <IOKit/IOCFPlugIn.h>
#include <IOKit/hid/IOHIDLib.h>
#include <IOKit/hid/IOHIDKeys.h>
#include <CoreFoundation/CoreFoundation.h>
#include "net_java_games_input_OSXHIDDeviceIterator.h"
#include "util.h"

JNIEXPORT jlong JNICALL Java_net_java_games_input_OSXHIDDeviceIterator_nCreateIterator(JNIEnv *env, jclass unused) {
    io_iterator_t hidObjectIterator;
    // Set up a matching dictionary to search the I/O Registry by class
    // name for all HID class devices
    //
    CFMutableDictionaryRef hidMatchDictionary = IOServiceMatching(kIOHIDDeviceKey);
    
    // Now search I/O Registry for matching devices.
    // IOServiceGetMatchingServices consumes a reference to the dictionary so we don't have to release it
    IOReturn ioReturnValue = IOServiceGetMatchingServices(kIOMasterPortDefault, hidMatchDictionary, &hidObjectIterator);
    
    if (ioReturnValue != kIOReturnSuccess) {
            throwIOException(env, "Failed to create iterator (%ld)\n", ioReturnValue);
            return 0;
      }
            
      if (hidObjectIterator == IO_OBJECT_NULL) {
            throwIOException(env, "Failed to create iterator\n");
            return 0;
      }
      return (jlong)hidObjectIterator;
}

JNIEXPORT void JNICALL Java_net_java_games_input_OSXHIDDeviceIterator_nReleaseIterator(JNIEnv *env, jclass unused, jlong address) {
      io_iterator_t iterator = (io_iterator_t)address;
    IOObjectRelease(iterator);
}

static IOHIDDeviceInterface **createHIDDevice(JNIEnv *env, io_object_t hidDevice) {
//    io_name_t               className;
      IOHIDDeviceInterface **hidDeviceInterface;
    IOCFPlugInInterface     **plugInInterface;
    SInt32                  score;
    
/*    ioReturnValue = IOObjectGetClass(hidDevice, className);
    if (ioReturnValue != kIOReturnSuccess) {
        printfJava(env, "Failed to get IOObject class name.");
    }
    
    printfJava(env, "Found device type [%s]\n", className);
  */  
    IOReturn ioReturnValue = IOCreatePlugInInterfaceForService(hidDevice,
                                                      kIOHIDDeviceUserClientTypeID,
                                                      kIOCFPlugInInterfaceID,
                                                      &plugInInterface,
                                                      &score);

      if (ioReturnValue != kIOReturnSuccess) {
            throwIOException(env, "Couldn't create plugin for device interface (%ld)\n", ioReturnValue);
            return NULL;
      }
      //Call a method of the intermediate plug-in to create the device 
      //interface
      //
      HRESULT plugInResult = (*plugInInterface)->QueryInterface(plugInInterface,
                  CFUUIDGetUUIDBytes(kIOHIDDeviceInterfaceID),
                  (LPVOID)&hidDeviceInterface);
      (*plugInInterface)->Release(plugInInterface);
      if (plugInResult != S_OK) {
            throwIOException(env, "Couldn't create HID class device interface (%ld)\n", plugInResult);
            return NULL;
      }
      return hidDeviceInterface;
}

JNIEXPORT jobject JNICALL Java_net_java_games_input_OSXHIDDeviceIterator_nNext(JNIEnv *env, jclass unused, jlong address) {
      io_iterator_t iterator = (io_iterator_t)address;
    io_object_t             hidDevice;
//    io_string_t             path;
//    kern_return_t           result;
    
    hidDevice = IOIteratorNext(iterator);
      if (hidDevice == MACH_PORT_NULL)
            return NULL;
/*    IOResult result = IORegistryEntryGetPath(hidDevice, kIOServicePlane, path);

      if (result != KERN_SUCCESS) {
            IOObjectRelease(hidDevice);
            throwIOException("Failed to get device path (%ld)\n", result);
            return NULL;
      }
*/
      IOHIDDeviceInterface **device_interface = createHIDDevice(env, hidDevice);
      if (device_interface == NULL) {
            IOObjectRelease(hidDevice);
            return NULL;
      }
    jobject device_object = newJObject(env, "net/java/games/input/OSXHIDDevice", "(JJ)V", (jlong)hidDevice, (jlong)(intptr_t)device_interface);
      if (device_object == NULL) {
            (*device_interface)->Release(device_interface);
            IOObjectRelease(hidDevice);
            return NULL;
      }
      return device_object;
}

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