1 /* 2 * Copyright 2016, 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 namespace android { 18 19 /* JNI Helpers for wifi_hal to WifiNative bridge implementation */ 20 21 class JNIHelper; 22 23 template<typename T> 24 class JNIObject { 25 protected: 26 JNIHelper &mHelper; 27 T mObj; 28 public: 29 JNIObject(JNIHelper &helper, T obj); 30 JNIObject(const JNIObject<T>& rhs); 31 virtual ~JNIObject(); 32 JNIHelper& getHelper() const { 33 return mHelper; 34 } 35 T get() const { 36 return mObj; 37 } 38 operator T() const { 39 return mObj; 40 } 41 bool isNull() const { 42 return mObj == NULL; 43 } 44 void release(); 45 T detach() { 46 T tObj = mObj; 47 mObj = NULL; 48 return tObj; 49 } 50 T clone(); 51 JNIObject<T>& operator = (const JNIObject<T>& rhs) { 52 release(); 53 mHelper = rhs.mHelper; 54 mObj = rhs.mObj; 55 return *this; 56 } 57 void print() { 58 ALOGD("holding %p", mObj); 59 } 60 61 private: 62 template<typename T2> 63 JNIObject(const JNIObject<T2>& rhs); 64 }; 65 66 class JNIHelper { 67 JavaVM *mVM; 68 JNIEnv *mEnv; 69 70 public : 71 JNIHelper(JavaVM *vm); 72 JNIHelper(JNIEnv *env); 73 ~JNIHelper(); 74 75 void throwException(const char *message, int line); 76 77 /* helpers to deal with members */ 78 jboolean getBoolField(jobject obj, const char *name); 79 jint getIntField(jobject obj, const char *name); 80 jlong getLongField(jobject obj, const char *name); 81 JNIObject<jstring> getStringField(jobject obj, const char *name); 82 bool getStringFieldValue(jobject obj, const char *name, char *buf, int size); 83 JNIObject<jobject> getObjectField(jobject obj, const char *name, const char *type); 84 JNIObject<jobjectArray> getArrayField(jobject obj, const char *name, const char *type); 85 void getByteArrayField(jobject obj, const char *name, byte* buf, int size); 86 jlong getLongArrayField(jobject obj, const char *name, int index); 87 JNIObject<jobject> getObjectArrayField( 88 jobject obj, const char *name, const char *type, int index); 89 void setIntField(jobject obj, const char *name, jint value); 90 void setByteField(jobject obj, const char *name, jbyte value); 91 jbyte getByteField(jobject obj, const char *name); 92 void setBooleanField(jobject obj, const char *name, jboolean value); 93 void setLongField(jobject obj, const char *name, jlong value); 94 void setLongArrayField(jobject obj, const char *name, jlongArray value); 95 void setLongArrayElement(jobject obj, const char *name, int index, jlong value); 96 jboolean setStringField(jobject obj, const char *name, const char *value); 97 void reportEvent(jclass cls, const char *method, const char *signature, ...); 98 JNIObject<jobject> createObject(const char *className); 99 JNIObject<jobject> createObjectWithArgs(const char *className, const char *signature, ...); 100 JNIObject<jobjectArray> createObjectArray(const char *className, int size); 101 void setObjectField(jobject obj, const char *name, const char *type, jobject value); 102 void callMethod(jobject obj, const char *method, const char *signature, ...); 103 104 /* helpers to deal with static members */ 105 jlong getStaticLongField(jobject obj, const char *name); 106 jlong getStaticLongField(jclass cls, const char *name); 107 void setStaticLongField(jobject obj, const char *name, jlong value); 108 void setStaticLongField(jclass cls, const char *name, jlong value); 109 jlong getStaticLongArrayField(jobject obj, const char *name, int index); 110 jlong getStaticLongArrayField(jclass cls, const char *name, int index); 111 void setStaticLongArrayField(jobject obj, const char *name, jlongArray value); 112 void setStaticLongArrayField(jclass obj, const char *name, jlongArray value); 113 jboolean callStaticMethod(jclass cls, const char *method, const char *signature, ...); 114 115 JNIObject<jobject> getObjectArrayElement(jobjectArray array, int index); 116 JNIObject<jobject> getObjectArrayElement(jobject array, int index); 117 int getArrayLength(jarray array); 118 JNIObject<jobjectArray> newObjectArray(int num, const char *className, jobject val); 119 JNIObject<jbyteArray> newByteArray(int num); 120 JNIObject<jintArray> newIntArray(int num); 121 JNIObject<jlongArray> newLongArray(int num); 122 JNIObject<jstring> newStringUTF(const char *utf); 123 void setObjectArrayElement(jobjectArray array, int index, jobject obj); 124 void setByteArrayRegion(jbyteArray array, int from, int to, const jbyte *bytes); 125 void setIntArrayRegion(jintArray array, int from, int to, const jint *ints); 126 void setLongArrayRegion(jlongArray array, int from, int to, const jlong *longs); 127 128 jobject newGlobalRef(jobject obj); 129 void deleteGlobalRef(jobject obj); 130 131 private: 132 /* Jni wrappers */ 133 friend class JNIObject<jobject>; 134 friend class JNIObject<jstring>; 135 friend class JNIObject<jobjectArray>; 136 friend class JNIObject<jclass>; 137 friend class JNIObject<jlongArray>; 138 friend class JNIObject<jbyteArray>; 139 friend class JNIObject<jintArray>; 140 jobject newLocalRef(jobject obj); 141 void deleteLocalRef(jobject obj); 142 }; 143 144 template<typename T> 145 JNIObject<T>::JNIObject(JNIHelper &helper, T obj) 146 : mHelper(helper), mObj(obj) 147 { } 148 149 template<typename T> 150 JNIObject<T>::JNIObject(const JNIObject<T>& rhs) 151 : mHelper(rhs.mHelper), mObj(NULL) 152 { 153 mObj = (T)mHelper.newLocalRef(rhs.mObj); 154 } 155 156 template<typename T> 157 JNIObject<T>::~JNIObject() { 158 release(); 159 } 160 161 template<typename T> 162 void JNIObject<T>::release() 163 { 164 if (mObj != NULL) { 165 mHelper.deleteLocalRef(mObj); 166 mObj = NULL; 167 } 168 } 169 170 template<typename T> 171 T JNIObject<T>::clone() 172 { 173 return mHelper.newLocalRef(mObj); 174 } 175 176 } 177 178 #define THROW(env, message) (env).throwException(message, __LINE__) 179
