core/jni/android_view_InputChannel.cpp - platform/frameworks/base - Git at Google

 /*
  * Copyright (C) 2010 The Android Open Source Project
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
  * You may obtain a copy of the License at
  *
  *      http://www.apache.org/licenses/LICENSE-2.0
  *
  * Unless required by applicable law or agreed to in writing, software
  * distributed under the License is distributed on an "AS IS" BASIS,
  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */

 #define LOG_TAG "InputChannel-JNI"

 #include "JNIHelp.h"

 #include <android_runtime/AndroidRuntime.h>
 #include <binder/Parcel.h>
 #include <utils/Log.h>
 #include <input/InputTransport.h>
 #include "android_view_InputChannel.h"
 #include "android_os_Parcel.h"
 #include "android_util_Binder.h"

 namespace android {

 // ----------------------------------------------------------------------------

 static struct {
     jclass clazz;

     jfieldID mPtr;   // native object attached to the DVM InputChannel
     jmethodID ctor;
 } gInputChannelClassInfo;

 // ----------------------------------------------------------------------------

 class NativeInputChannel {
 public:
     NativeInputChannel(const sp<InputChannel>& inputChannel);
     ~NativeInputChannel();

     inline sp<InputChannel> getInputChannel() { return mInputChannel; }

     void setDisposeCallback(InputChannelObjDisposeCallback callback, void* data);
     void invokeAndRemoveDisposeCallback(JNIEnv* env, jobject obj);

 private:
     sp<InputChannel> mInputChannel;
     InputChannelObjDisposeCallback mDisposeCallback;
     void* mDisposeData;
 };

 // ----------------------------------------------------------------------------

 NativeInputChannel::NativeInputChannel(const sp<InputChannel>& inputChannel) :
     mInputChannel(inputChannel), mDisposeCallback(NULL) {
 }

 NativeInputChannel::~NativeInputChannel() {
 }

 void NativeInputChannel::setDisposeCallback(InputChannelObjDisposeCallback callback, void* data) {
     mDisposeCallback = callback;
     mDisposeData = data;
 }

 void NativeInputChannel::invokeAndRemoveDisposeCallback(JNIEnv* env, jobject obj) {
     if (mDisposeCallback) {
         mDisposeCallback(env, obj, mInputChannel, mDisposeData);
         mDisposeCallback = NULL;
         mDisposeData = NULL;
     }
 }

 // ----------------------------------------------------------------------------

 static NativeInputChannel* android_view_InputChannel_getNativeInputChannel(JNIEnv* env,
         jobject inputChannelObj) {
     jlong longPtr = env->GetLongField(inputChannelObj, gInputChannelClassInfo.mPtr);
     return reinterpret_cast<NativeInputChannel*>(longPtr);
 }

 static void android_view_InputChannel_setNativeInputChannel(JNIEnv* env, jobject inputChannelObj,
         NativeInputChannel* nativeInputChannel) {
     env->SetLongField(inputChannelObj, gInputChannelClassInfo.mPtr,
              reinterpret_cast<jlong>(nativeInputChannel));
 }

 sp<InputChannel> android_view_InputChannel_getInputChannel(JNIEnv* env, jobject inputChannelObj) {
     NativeInputChannel* nativeInputChannel =
             android_view_InputChannel_getNativeInputChannel(env, inputChannelObj);
     return nativeInputChannel != NULL ? nativeInputChannel->getInputChannel() : NULL;
 }

 void android_view_InputChannel_setDisposeCallback(JNIEnv* env, jobject inputChannelObj,
         InputChannelObjDisposeCallback callback, void* data) {
     NativeInputChannel* nativeInputChannel =
             android_view_InputChannel_getNativeInputChannel(env, inputChannelObj);
     if (nativeInputChannel == NULL) {
         ALOGW("Cannot set dispose callback because input channel object has not been initialized.");
     } else {
         nativeInputChannel->setDisposeCallback(callback, data);
     }
 }

 static jobject android_view_InputChannel_createInputChannel(JNIEnv* env,
         NativeInputChannel* nativeInputChannel) {
     jobject inputChannelObj = env->NewObject(gInputChannelClassInfo.clazz,
             gInputChannelClassInfo.ctor);
     if (inputChannelObj) {
         android_view_InputChannel_setNativeInputChannel(env, inputChannelObj, nativeInputChannel);
     }
     return inputChannelObj;
 }

 static jobjectArray android_view_InputChannel_nativeOpenInputChannelPair(JNIEnv* env,
         jclass clazz, jstring nameObj) {
     const char* nameChars = env->GetStringUTFChars(nameObj, NULL);
     String8 name(nameChars);
     env->ReleaseStringUTFChars(nameObj, nameChars);

     sp<InputChannel> serverChannel;
     sp<InputChannel> clientChannel;
     status_t result = InputChannel::openInputChannelPair(name, serverChannel, clientChannel);

     if (result) {
         String8 message;
         message.appendFormat("Could not open input channel pair.  status=%d", result);
         jniThrowRuntimeException(env, message.string());
         return NULL;
     }

     jobjectArray channelPair = env->NewObjectArray(2, gInputChannelClassInfo.clazz, NULL);
     if (env->ExceptionCheck()) {
         return NULL;
     }

     jobject serverChannelObj = android_view_InputChannel_createInputChannel(env,
             new NativeInputChannel(serverChannel));
     if (env->ExceptionCheck()) {
         return NULL;
     }

     jobject clientChannelObj = android_view_InputChannel_createInputChannel(env,
             new NativeInputChannel(clientChannel));
     if (env->ExceptionCheck()) {
         return NULL;
     }

     env->SetObjectArrayElement(channelPair, 0, serverChannelObj);
     env->SetObjectArrayElement(channelPair, 1, clientChannelObj);
     return channelPair;
 }

 static void android_view_InputChannel_nativeDispose(JNIEnv* env, jobject obj, jboolean finalized) {
     NativeInputChannel* nativeInputChannel =
             android_view_InputChannel_getNativeInputChannel(env, obj);
     if (nativeInputChannel) {
         if (finalized) {
             ALOGW("Input channel object '%s' was finalized without being disposed!",
                     nativeInputChannel->getInputChannel()->getName().string());
         }

         nativeInputChannel->invokeAndRemoveDisposeCallback(env, obj);

         android_view_InputChannel_setNativeInputChannel(env, obj, NULL);
         delete nativeInputChannel;
     }
 }

 static void android_view_InputChannel_nativeTransferTo(JNIEnv* env, jobject obj,
         jobject otherObj) {
     if (android_view_InputChannel_getNativeInputChannel(env, otherObj) != NULL) {
         jniThrowException(env, "java/lang/IllegalStateException",
                 "Other object already has a native input channel.");
         return;
     }

     NativeInputChannel* nativeInputChannel =
             android_view_InputChannel_getNativeInputChannel(env, obj);
     android_view_InputChannel_setNativeInputChannel(env, otherObj, nativeInputChannel);
     android_view_InputChannel_setNativeInputChannel(env, obj, NULL);
 }

 static void android_view_InputChannel_nativeReadFromParcel(JNIEnv* env, jobject obj,
         jobject parcelObj) {
     if (android_view_InputChannel_getNativeInputChannel(env, obj) != NULL) {
         jniThrowException(env, "java/lang/IllegalStateException",
                 "This object already has a native input channel.");
         return;
     }

     Parcel* parcel = parcelForJavaObject(env, parcelObj);
     if (parcel) {
         bool isInitialized = parcel->readInt32();
         if (isInitialized) {
             String8 name = parcel->readString8();
             int rawFd = parcel->readFileDescriptor();
             int dupFd = dup(rawFd);
             if (dupFd < 0) {
                 ALOGE("Error %d dup channel fd %d.", errno, rawFd);
                 jniThrowRuntimeException(env,
                         "Could not read input channel file descriptors from parcel.");
                 return;
             }

             InputChannel* inputChannel = new InputChannel(name, dupFd);
             NativeInputChannel* nativeInputChannel = new NativeInputChannel(inputChannel);

             android_view_InputChannel_setNativeInputChannel(env, obj, nativeInputChannel);
         }
     }
 }

 static void android_view_InputChannel_nativeWriteToParcel(JNIEnv* env, jobject obj,
         jobject parcelObj) {
     Parcel* parcel = parcelForJavaObject(env, parcelObj);
     if (parcel) {
         NativeInputChannel* nativeInputChannel =
                 android_view_InputChannel_getNativeInputChannel(env, obj);
         if (nativeInputChannel) {
             sp<InputChannel> inputChannel = nativeInputChannel->getInputChannel();

             parcel->writeInt32(1);
             parcel->writeString8(inputChannel->getName());
             parcel->writeDupFileDescriptor(inputChannel->getFd());
         } else {
             parcel->writeInt32(0);
         }
     }
 }

 static jstring android_view_InputChannel_nativeGetName(JNIEnv* env, jobject obj) {
     NativeInputChannel* nativeInputChannel =
             android_view_InputChannel_getNativeInputChannel(env, obj);
     if (! nativeInputChannel) {
         return NULL;
     }

     jstring name = env->NewStringUTF(nativeInputChannel->getInputChannel()->getName().string());
     return name;
 }

 static void android_view_InputChannel_nativeDup(JNIEnv* env, jobject obj, jobject otherObj) {
     NativeInputChannel* nativeInputChannel =
             android_view_InputChannel_getNativeInputChannel(env, obj);
     if (nativeInputChannel) {
         android_view_InputChannel_setNativeInputChannel(env, otherObj,
                 new NativeInputChannel(nativeInputChannel->getInputChannel()->dup()));
     }
 }

 // ----------------------------------------------------------------------------

 static JNINativeMethod gInputChannelMethods[] = {
     /* name, signature, funcPtr */
     { "nativeOpenInputChannelPair", "(Ljava/lang/String;)[Landroid/view/InputChannel;",
             (void*)android_view_InputChannel_nativeOpenInputChannelPair },
     { "nativeDispose", "(Z)V",
             (void*)android_view_InputChannel_nativeDispose },
     { "nativeTransferTo", "(Landroid/view/InputChannel;)V",
             (void*)android_view_InputChannel_nativeTransferTo },
     { "nativeReadFromParcel", "(Landroid/os/Parcel;)V",
             (void*)android_view_InputChannel_nativeReadFromParcel },
     { "nativeWriteToParcel", "(Landroid/os/Parcel;)V",
             (void*)android_view_InputChannel_nativeWriteToParcel },
     { "nativeGetName", "()Ljava/lang/String;",
             (void*)android_view_InputChannel_nativeGetName },
     { "nativeDup", "(Landroid/view/InputChannel;)V",
             (void*)android_view_InputChannel_nativeDup },
 };

 #define FIND_CLASS(var, className) \
         var = env->FindClass(className); \
         LOG_FATAL_IF(! var, "Unable to find class " className); \
         var = jclass(env->NewGlobalRef(var));

 #define GET_METHOD_ID(var, clazz, methodName, methodDescriptor) \
         var = env->GetMethodID(clazz, methodName, methodDescriptor); \
         LOG_FATAL_IF(! var, "Unable to find method " methodName);

 #define GET_FIELD_ID(var, clazz, fieldName, fieldDescriptor) \
         var = env->GetFieldID(clazz, fieldName, fieldDescriptor); \
         LOG_FATAL_IF(! var, "Unable to find field " fieldName);

 int register_android_view_InputChannel(JNIEnv* env) {
     int res = jniRegisterNativeMethods(env, "android/view/InputChannel",
             gInputChannelMethods, NELEM(gInputChannelMethods));
     LOG_FATAL_IF(res < 0, "Unable to register native methods.");

     FIND_CLASS(gInputChannelClassInfo.clazz, "android/view/InputChannel");

     GET_FIELD_ID(gInputChannelClassInfo.mPtr, gInputChannelClassInfo.clazz,
             "mPtr", "J");

     GET_METHOD_ID(gInputChannelClassInfo.ctor, gInputChannelClassInfo.clazz,
             "<init>", "()V");

     return 0;
 }

 } // namespace android
	/*
	* Copyright (C) 2010 The Android Open Source Project
	*
	* Licensed under the Apache License, Version 2.0 (the "License");
	* you may not use this file except in compliance with the License.
	* You may obtain a copy of the License at
	*
	* http://www.apache.org/licenses/LICENSE-2.0
	*
	* Unless required by applicable law or agreed to in writing, software
	* distributed under the License is distributed on an "AS IS" BASIS,
	* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
	* See the License for the specific language governing permissions and
	* limitations under the License.
	*/

	#define LOG_TAG "InputChannel-JNI"

	#include "JNIHelp.h"

	#include <android_runtime/AndroidRuntime.h>
	#include <binder/Parcel.h>
	#include <utils/Log.h>
	#include <input/InputTransport.h>
	#include "android_view_InputChannel.h"
	#include "android_os_Parcel.h"
	#include "android_util_Binder.h"

	namespace android {

	// ----------------------------------------------------------------------------

	static struct {
	jclass clazz;

	jfieldID mPtr; // native object attached to the DVM InputChannel
	jmethodID ctor;
	} gInputChannelClassInfo;

	// ----------------------------------------------------------------------------

	class NativeInputChannel {
	public:
	NativeInputChannel(const sp<InputChannel>& inputChannel);
	~NativeInputChannel();

	inline sp<InputChannel> getInputChannel() { return mInputChannel; }

	void setDisposeCallback(InputChannelObjDisposeCallback callback, void* data);
	void invokeAndRemoveDisposeCallback(JNIEnv* env, jobject obj);

	private:
	sp<InputChannel> mInputChannel;
	InputChannelObjDisposeCallback mDisposeCallback;
	void* mDisposeData;
	};

	// ----------------------------------------------------------------------------

	NativeInputChannel::NativeInputChannel(const sp<InputChannel>& inputChannel) :
	mInputChannel(inputChannel), mDisposeCallback(NULL) {
	}

	NativeInputChannel::~NativeInputChannel() {
	}

	void NativeInputChannel::setDisposeCallback(InputChannelObjDisposeCallback callback, void* data) {
	mDisposeCallback = callback;
	mDisposeData = data;
	}

	void NativeInputChannel::invokeAndRemoveDisposeCallback(JNIEnv* env, jobject obj) {
	if (mDisposeCallback) {
	mDisposeCallback(env, obj, mInputChannel, mDisposeData);
	mDisposeCallback = NULL;
	mDisposeData = NULL;
	}
	}

	// ----------------------------------------------------------------------------

	static NativeInputChannel* android_view_InputChannel_getNativeInputChannel(JNIEnv* env,
	jobject inputChannelObj) {
	jlong longPtr = env->GetLongField(inputChannelObj, gInputChannelClassInfo.mPtr);
	return reinterpret_cast<NativeInputChannel*>(longPtr);
	}

	static void android_view_InputChannel_setNativeInputChannel(JNIEnv* env, jobject inputChannelObj,
	NativeInputChannel* nativeInputChannel) {
	env->SetLongField(inputChannelObj, gInputChannelClassInfo.mPtr,
	reinterpret_cast<jlong>(nativeInputChannel));
	}

	sp<InputChannel> android_view_InputChannel_getInputChannel(JNIEnv* env, jobject inputChannelObj) {
	NativeInputChannel* nativeInputChannel =
	android_view_InputChannel_getNativeInputChannel(env, inputChannelObj);
	return nativeInputChannel != NULL ? nativeInputChannel->getInputChannel() : NULL;
	}

	void android_view_InputChannel_setDisposeCallback(JNIEnv* env, jobject inputChannelObj,
	InputChannelObjDisposeCallback callback, void* data) {
	NativeInputChannel* nativeInputChannel =
	android_view_InputChannel_getNativeInputChannel(env, inputChannelObj);
	if (nativeInputChannel == NULL) {
	ALOGW("Cannot set dispose callback because input channel object has not been initialized.");
	} else {
	nativeInputChannel->setDisposeCallback(callback, data);
	}
	}

	static jobject android_view_InputChannel_createInputChannel(JNIEnv* env,
	NativeInputChannel* nativeInputChannel) {
	jobject inputChannelObj = env->NewObject(gInputChannelClassInfo.clazz,
	gInputChannelClassInfo.ctor);
	if (inputChannelObj) {
	android_view_InputChannel_setNativeInputChannel(env, inputChannelObj, nativeInputChannel);
	}
	return inputChannelObj;
	}

	static jobjectArray android_view_InputChannel_nativeOpenInputChannelPair(JNIEnv* env,
	jclass clazz, jstring nameObj) {
	const char* nameChars = env->GetStringUTFChars(nameObj, NULL);
	String8 name(nameChars);
	env->ReleaseStringUTFChars(nameObj, nameChars);

	sp<InputChannel> serverChannel;
	sp<InputChannel> clientChannel;
	status_t result = InputChannel::openInputChannelPair(name, serverChannel, clientChannel);

	if (result) {
	String8 message;
	message.appendFormat("Could not open input channel pair. status=%d", result);
	jniThrowRuntimeException(env, message.string());
	return NULL;
	}

	jobjectArray channelPair = env->NewObjectArray(2, gInputChannelClassInfo.clazz, NULL);
	if (env->ExceptionCheck()) {
	return NULL;
	}

	jobject serverChannelObj = android_view_InputChannel_createInputChannel(env,
	new NativeInputChannel(serverChannel));
	if (env->ExceptionCheck()) {
	return NULL;
	}

	jobject clientChannelObj = android_view_InputChannel_createInputChannel(env,
	new NativeInputChannel(clientChannel));
	if (env->ExceptionCheck()) {
	return NULL;
	}

	env->SetObjectArrayElement(channelPair, 0, serverChannelObj);
	env->SetObjectArrayElement(channelPair, 1, clientChannelObj);
	return channelPair;
	}

	static void android_view_InputChannel_nativeDispose(JNIEnv* env, jobject obj, jboolean finalized) {
	NativeInputChannel* nativeInputChannel =
	android_view_InputChannel_getNativeInputChannel(env, obj);
	if (nativeInputChannel) {
	if (finalized) {
	ALOGW("Input channel object '%s' was finalized without being disposed!",
	nativeInputChannel->getInputChannel()->getName().string());
	}

	nativeInputChannel->invokeAndRemoveDisposeCallback(env, obj);

	android_view_InputChannel_setNativeInputChannel(env, obj, NULL);
	delete nativeInputChannel;
	}
	}

	static void android_view_InputChannel_nativeTransferTo(JNIEnv* env, jobject obj,
	jobject otherObj) {
	if (android_view_InputChannel_getNativeInputChannel(env, otherObj) != NULL) {
	jniThrowException(env, "java/lang/IllegalStateException",
	"Other object already has a native input channel.");
	return;
	}

	NativeInputChannel* nativeInputChannel =
	android_view_InputChannel_getNativeInputChannel(env, obj);
	android_view_InputChannel_setNativeInputChannel(env, otherObj, nativeInputChannel);
	android_view_InputChannel_setNativeInputChannel(env, obj, NULL);
	}

	static void android_view_InputChannel_nativeReadFromParcel(JNIEnv* env, jobject obj,
	jobject parcelObj) {
	if (android_view_InputChannel_getNativeInputChannel(env, obj) != NULL) {
	jniThrowException(env, "java/lang/IllegalStateException",
	"This object already has a native input channel.");
	return;
	}

	Parcel* parcel = parcelForJavaObject(env, parcelObj);
	if (parcel) {
	bool isInitialized = parcel->readInt32();
	if (isInitialized) {
	String8 name = parcel->readString8();
	int rawFd = parcel->readFileDescriptor();
	int dupFd = dup(rawFd);
	if (dupFd < 0) {
	ALOGE("Error %d dup channel fd %d.", errno, rawFd);
	jniThrowRuntimeException(env,
	"Could not read input channel file descriptors from parcel.");
	return;
	}

	InputChannel* inputChannel = new InputChannel(name, dupFd);
	NativeInputChannel* nativeInputChannel = new NativeInputChannel(inputChannel);

	android_view_InputChannel_setNativeInputChannel(env, obj, nativeInputChannel);
	}
	}
	}

	static void android_view_InputChannel_nativeWriteToParcel(JNIEnv* env, jobject obj,
	jobject parcelObj) {
	Parcel* parcel = parcelForJavaObject(env, parcelObj);
	if (parcel) {
	NativeInputChannel* nativeInputChannel =
	android_view_InputChannel_getNativeInputChannel(env, obj);
	if (nativeInputChannel) {
	sp<InputChannel> inputChannel = nativeInputChannel->getInputChannel();

	parcel->writeInt32(1);
	parcel->writeString8(inputChannel->getName());
	parcel->writeDupFileDescriptor(inputChannel->getFd());
	} else {
	parcel->writeInt32(0);
	}
	}
	}

	static jstring android_view_InputChannel_nativeGetName(JNIEnv* env, jobject obj) {
	NativeInputChannel* nativeInputChannel =
	android_view_InputChannel_getNativeInputChannel(env, obj);
	if (! nativeInputChannel) {
	return NULL;
	}

	jstring name = env->NewStringUTF(nativeInputChannel->getInputChannel()->getName().string());
	return name;
	}

	static void android_view_InputChannel_nativeDup(JNIEnv* env, jobject obj, jobject otherObj) {
	NativeInputChannel* nativeInputChannel =
	android_view_InputChannel_getNativeInputChannel(env, obj);
	if (nativeInputChannel) {
	android_view_InputChannel_setNativeInputChannel(env, otherObj,
	new NativeInputChannel(nativeInputChannel->getInputChannel()->dup()));
	}
	}

	// ----------------------------------------------------------------------------

	static JNINativeMethod gInputChannelMethods[] = {
	/* name, signature, funcPtr */
	{ "nativeOpenInputChannelPair", "(Ljava/lang/String;)[Landroid/view/InputChannel;",
	(void*)android_view_InputChannel_nativeOpenInputChannelPair },
	{ "nativeDispose", "(Z)V",
	(void*)android_view_InputChannel_nativeDispose },
	{ "nativeTransferTo", "(Landroid/view/InputChannel;)V",
	(void*)android_view_InputChannel_nativeTransferTo },
	{ "nativeReadFromParcel", "(Landroid/os/Parcel;)V",
	(void*)android_view_InputChannel_nativeReadFromParcel },
	{ "nativeWriteToParcel", "(Landroid/os/Parcel;)V",
	(void*)android_view_InputChannel_nativeWriteToParcel },
	{ "nativeGetName", "()Ljava/lang/String;",
	(void*)android_view_InputChannel_nativeGetName },
	{ "nativeDup", "(Landroid/view/InputChannel;)V",
	(void*)android_view_InputChannel_nativeDup },
	};

	#define FIND_CLASS(var, className) \
	var = env->FindClass(className); \
	LOG_FATAL_IF(! var, "Unable to find class " className); \
	var = jclass(env->NewGlobalRef(var));

	#define GET_METHOD_ID(var, clazz, methodName, methodDescriptor) \
	var = env->GetMethodID(clazz, methodName, methodDescriptor); \
	LOG_FATAL_IF(! var, "Unable to find method " methodName);

	#define GET_FIELD_ID(var, clazz, fieldName, fieldDescriptor) \
	var = env->GetFieldID(clazz, fieldName, fieldDescriptor); \
	LOG_FATAL_IF(! var, "Unable to find field " fieldName);

	int register_android_view_InputChannel(JNIEnv* env) {
	int res = jniRegisterNativeMethods(env, "android/view/InputChannel",
	gInputChannelMethods, NELEM(gInputChannelMethods));
	LOG_FATAL_IF(res < 0, "Unable to register native methods.");

	FIND_CLASS(gInputChannelClassInfo.clazz, "android/view/InputChannel");

	GET_FIELD_ID(gInputChannelClassInfo.mPtr, gInputChannelClassInfo.clazz,
	"mPtr", "J");

	GET_METHOD_ID(gInputChannelClassInfo.ctor, gInputChannelClassInfo.clazz,
	"<init>", "()V");

	return 0;
	}

	} // namespace android