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
17namespace android {
18
19/* JNI Helpers for wifi_hal to WifiNative bridge implementation */
20
21class JNIHelper;
22
23template<typename T>
24class JNIObject {
25protected:
26    JNIHelper &mHelper;
27    T mObj;
28public:
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
61private:
62    template<typename T2>
63    JNIObject(const JNIObject<T2>& rhs);  // NOLINT(implicit)
64};
65
66class JNIHelper {
67    JavaVM *mVM;
68    JNIEnv *mEnv;
69
70public :
71    explicit JNIHelper(JavaVM *vm);
72    explicit JNIHelper(JNIEnv *env);
73    ~JNIHelper();
74
75    /* helpers to deal with static members */
76    JNIObject<jbyteArray> newByteArray(int num);
77    void setByteArrayRegion(jbyteArray array, int from, int to, const jbyte *bytes);
78
79private:
80    /* Jni wrappers */
81    friend class JNIObject<jbyteArray>;
82    jobject newLocalRef(jobject obj);
83    void deleteLocalRef(jobject obj);
84};
85
86template<typename T>
87JNIObject<T>::JNIObject(JNIHelper &helper, T obj)
88      : mHelper(helper), mObj(obj)
89{ }
90
91template<typename T>
92JNIObject<T>::JNIObject(const JNIObject<T>& rhs)
93      : mHelper(rhs.mHelper), mObj(NULL)
94{
95      mObj = (T)mHelper.newLocalRef(rhs.mObj);
96}
97
98template<typename T>
99JNIObject<T>::~JNIObject() {
100      release();
101}
102
103template<typename T>
104void JNIObject<T>::release()
105{
106      if (mObj != NULL) {
107          mHelper.deleteLocalRef(mObj);
108          mObj = NULL;
109      }
110}
111
112template<typename T>
113T JNIObject<T>::clone()
114{
115      return mHelper.newLocalRef(mObj);
116}
117}
118
119#define THROW(env, message)      (env).throwException(message, __LINE__)
120