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      1 /*
      2  * Copyright (C) 2011 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 
     17 #define LOG_TAG "InputApplicationHandle"
     18 
     19 #include <nativehelper/JNIHelp.h>
     20 #include "jni.h"
     21 #include <android_runtime/AndroidRuntime.h>
     22 #include <utils/threads.h>
     23 
     24 #include "com_android_server_input_InputApplicationHandle.h"
     25 
     26 namespace android {
     27 
     28 static struct {
     29     jfieldID ptr;
     30     jfieldID name;
     31     jfieldID dispatchingTimeoutNanos;
     32 } gInputApplicationHandleClassInfo;
     33 
     34 static Mutex gHandleMutex;
     35 
     36 
     37 // --- NativeInputApplicationHandle ---
     38 
     39 NativeInputApplicationHandle::NativeInputApplicationHandle(jweak objWeak) :
     40         mObjWeak(objWeak) {
     41 }
     42 
     43 NativeInputApplicationHandle::~NativeInputApplicationHandle() {
     44     JNIEnv* env = AndroidRuntime::getJNIEnv();
     45     env->DeleteWeakGlobalRef(mObjWeak);
     46 }
     47 
     48 jobject NativeInputApplicationHandle::getInputApplicationHandleObjLocalRef(JNIEnv* env) {
     49     return env->NewLocalRef(mObjWeak);
     50 }
     51 
     52 bool NativeInputApplicationHandle::updateInfo() {
     53     JNIEnv* env = AndroidRuntime::getJNIEnv();
     54     jobject obj = env->NewLocalRef(mObjWeak);
     55     if (!obj) {
     56         releaseInfo();
     57         return false;
     58     }
     59 
     60     if (!mInfo) {
     61         mInfo = new InputApplicationInfo();
     62     }
     63 
     64     jstring nameObj = jstring(env->GetObjectField(obj,
     65             gInputApplicationHandleClassInfo.name));
     66     if (nameObj) {
     67         const char* nameStr = env->GetStringUTFChars(nameObj, NULL);
     68         mInfo->name = nameStr;
     69         env->ReleaseStringUTFChars(nameObj, nameStr);
     70         env->DeleteLocalRef(nameObj);
     71     } else {
     72         mInfo->name = "<null>";
     73     }
     74 
     75     mInfo->dispatchingTimeout = env->GetLongField(obj,
     76             gInputApplicationHandleClassInfo.dispatchingTimeoutNanos);
     77 
     78     env->DeleteLocalRef(obj);
     79     return true;
     80 }
     81 
     82 
     83 // --- Global functions ---
     84 
     85 sp<InputApplicationHandle> android_server_InputApplicationHandle_getHandle(
     86         JNIEnv* env, jobject inputApplicationHandleObj) {
     87     if (!inputApplicationHandleObj) {
     88         return NULL;
     89     }
     90 
     91     AutoMutex _l(gHandleMutex);
     92 
     93     jlong ptr = env->GetLongField(inputApplicationHandleObj, gInputApplicationHandleClassInfo.ptr);
     94     NativeInputApplicationHandle* handle;
     95     if (ptr) {
     96         handle = reinterpret_cast<NativeInputApplicationHandle*>(ptr);
     97     } else {
     98         jweak objWeak = env->NewWeakGlobalRef(inputApplicationHandleObj);
     99         handle = new NativeInputApplicationHandle(objWeak);
    100         handle->incStrong((void*)android_server_InputApplicationHandle_getHandle);
    101         env->SetLongField(inputApplicationHandleObj, gInputApplicationHandleClassInfo.ptr,
    102                 reinterpret_cast<jlong>(handle));
    103     }
    104     return handle;
    105 }
    106 
    107 
    108 // --- JNI ---
    109 
    110 static void android_server_InputApplicationHandle_nativeDispose(JNIEnv* env, jobject obj) {
    111     AutoMutex _l(gHandleMutex);
    112 
    113     jlong ptr = env->GetLongField(obj, gInputApplicationHandleClassInfo.ptr);
    114     if (ptr) {
    115         env->SetLongField(obj, gInputApplicationHandleClassInfo.ptr, 0);
    116 
    117         NativeInputApplicationHandle* handle = reinterpret_cast<NativeInputApplicationHandle*>(ptr);
    118         handle->decStrong((void*)android_server_InputApplicationHandle_getHandle);
    119     }
    120 }
    121 
    122 
    123 static const JNINativeMethod gInputApplicationHandleMethods[] = {
    124     /* name, signature, funcPtr */
    125     { "nativeDispose", "()V",
    126             (void*) android_server_InputApplicationHandle_nativeDispose },
    127 };
    128 
    129 #define FIND_CLASS(var, className) \
    130         var = env->FindClass(className); \
    131         LOG_FATAL_IF(! (var), "Unable to find class " className);
    132 
    133 #define GET_FIELD_ID(var, clazz, fieldName, fieldDescriptor) \
    134         var = env->GetFieldID(clazz, fieldName, fieldDescriptor); \
    135         LOG_FATAL_IF(! (var), "Unable to find field " fieldName);
    136 
    137 int register_android_server_InputApplicationHandle(JNIEnv* env) {
    138     int res = jniRegisterNativeMethods(env, "com/android/server/input/InputApplicationHandle",
    139             gInputApplicationHandleMethods, NELEM(gInputApplicationHandleMethods));
    140     (void) res;  // Faked use when LOG_NDEBUG.
    141     LOG_FATAL_IF(res < 0, "Unable to register native methods.");
    142 
    143     jclass clazz;
    144     FIND_CLASS(clazz, "com/android/server/input/InputApplicationHandle");
    145 
    146     GET_FIELD_ID(gInputApplicationHandleClassInfo.ptr, clazz,
    147             "ptr", "J");
    148 
    149     GET_FIELD_ID(gInputApplicationHandleClassInfo.name, clazz,
    150             "name", "Ljava/lang/String;");
    151 
    152     GET_FIELD_ID(gInputApplicationHandleClassInfo.dispatchingTimeoutNanos,
    153             clazz,
    154             "dispatchingTimeoutNanos", "J");
    155 
    156     return 0;
    157 }
    158 
    159 } /* namespace android */
    160