/*
* 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 <nativehelper/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"
#include "core_jni_helpers.h"
namespace android {
// ----------------------------------------------------------------------------
static struct {
jclass clazz;
jfieldID mPtr; // native object attached to the DVM InputChannel
jmethodID ctor;
} gInputChannelClassInfo;
// ----------------------------------------------------------------------------
class NativeInputChannel {
public:
explicit 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,
std::unique_ptr<NativeInputChannel> nativeInputChannel) {
jobject inputChannelObj = env->NewObject(gInputChannelClassInfo.clazz,
gInputChannelClassInfo.ctor);
if (inputChannelObj) {
android_view_InputChannel_setNativeInputChannel(env, inputChannelObj,
nativeInputChannel.release());
}
return inputChannelObj;
}
static jobjectArray android_view_InputChannel_nativeOpenInputChannelPair(JNIEnv* env,
jclass clazz, jstring nameObj) {
const char* nameChars = env->GetStringUTFChars(nameObj, NULL);
std::string 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,
std::make_unique<NativeInputChannel>(serverChannel));
if (env->ExceptionCheck()) {
return NULL;
}
jobject clientChannelObj = android_view_InputChannel_createInputChannel(env,
std::make_unique<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().c_str());
}
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.string(), 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(String8(inputChannel->getName().c_str()));
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().c_str());
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 const 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 },
};
int register_android_view_InputChannel(JNIEnv* env) {
int res = RegisterMethodsOrDie(env, "android/view/InputChannel", gInputChannelMethods,
NELEM(gInputChannelMethods));
jclass clazz = FindClassOrDie(env, "android/view/InputChannel");
gInputChannelClassInfo.clazz = MakeGlobalRefOrDie(env, clazz);
gInputChannelClassInfo.mPtr = GetFieldIDOrDie(env, gInputChannelClassInfo.clazz, "mPtr", "J");
gInputChannelClassInfo.ctor = GetMethodIDOrDie(env, gInputChannelClassInfo.clazz, "<init>",
"()V");
return res;
}
} // namespace android