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();
getHelper()32 JNIHelper& getHelper() const {
33 return mHelper;
34 }
get()35 T get() const {
36 return mObj;
37 }
T()38 operator T() const {
39 return mObj;
40 }
isNull()41 bool isNull() const {
42 return mObj == NULL;
43 }
44 void release();
detach()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 }
print()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>
JNIObject(JNIHelper & helper,T obj)145 JNIObject<T>::JNIObject(JNIHelper &helper, T obj)
146 : mHelper(helper), mObj(obj)
147 { }
148
149 template<typename T>
JNIObject(const JNIObject<T> & rhs)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>
~JNIObject()157 JNIObject<T>::~JNIObject() {
158 release();
159 }
160
161 template<typename T>
release()162 void JNIObject<T>::release()
163 {
164 if (mObj != NULL) {
165 mHelper.deleteLocalRef(mObj);
166 mObj = NULL;
167 }
168 }
169
170 template<typename T>
clone()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