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1 // Copyright (c) 2012 The Chromium Authors. All rights reserved. | 1 // Copyright (c) 2012 The Chromium Authors. All rights reserved. |
2 // Use of this source code is governed by a BSD-style license that can be | 2 // Use of this source code is governed by a BSD-style license that can be |
3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
4 | 4 |
5 #ifndef BASE_ANDROID_SCOPED_JAVA_REF_H_ | 5 #ifndef BASE_ANDROID_SCOPED_JAVA_REF_H_ |
6 #define BASE_ANDROID_SCOPED_JAVA_REF_H_ | 6 #define BASE_ANDROID_SCOPED_JAVA_REF_H_ |
7 | 7 |
8 #include <jni.h> | 8 #include <jni.h> |
9 #include <stddef.h> | 9 #include <stddef.h> |
10 | 10 |
11 #include "base/base_export.h" | 11 #include "base/base_export.h" |
12 #include "base/basictypes.h" | 12 #include "base/basictypes.h" |
13 | 13 |
14 namespace base { | 14 namespace base { |
15 namespace android { | 15 namespace android { |
16 | 16 |
| 17 // Creates a new local reference frame, in which at least a given number of |
| 18 // local references can be created. Note that local references already created |
| 19 // in previous local frames are still valid in the current local frame. |
| 20 class BASE_EXPORT ScopedJavaLocalFrame { |
| 21 public: |
| 22 explicit ScopedJavaLocalFrame(JNIEnv* env); |
| 23 ScopedJavaLocalFrame(JNIEnv* env, int capacity); |
| 24 ~ScopedJavaLocalFrame(); |
| 25 |
| 26 private: |
| 27 // This class is only good for use on the thread it was created on so |
| 28 // it's safe to cache the non-threadsafe JNIEnv* inside this object. |
| 29 JNIEnv* env_; |
| 30 |
| 31 DISALLOW_COPY_AND_ASSIGN(ScopedJavaLocalFrame); |
| 32 }; |
| 33 |
17 // Forward declare the generic java reference template class. | 34 // Forward declare the generic java reference template class. |
18 template<typename T> class JavaRef; | 35 template<typename T> class JavaRef; |
19 | 36 |
20 // Template specialization of JavaRef, which acts as the base class for all | 37 // Template specialization of JavaRef, which acts as the base class for all |
21 // other JavaRef<> template types. This allows you to e.g. pass | 38 // other JavaRef<> template types. This allows you to e.g. pass |
22 // ScopedJavaLocalRef<jstring> into a function taking const JavaRef<jobject>& | 39 // ScopedJavaLocalRef<jstring> into a function taking const JavaRef<jobject>& |
23 template<> | 40 template<> |
24 class BASE_EXPORT JavaRef<jobject> { | 41 class BASE_EXPORT JavaRef<jobject> { |
25 public: | 42 public: |
26 jobject obj() const { return obj_; } | 43 jobject obj() const { return obj_; } |
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189 // global reference when it is done with it. | 206 // global reference when it is done with it. |
190 T Release() { | 207 T Release() { |
191 return static_cast<T>(this->ReleaseInternal()); | 208 return static_cast<T>(this->ReleaseInternal()); |
192 } | 209 } |
193 }; | 210 }; |
194 | 211 |
195 } // namespace android | 212 } // namespace android |
196 } // namespace base | 213 } // namespace base |
197 | 214 |
198 #endif // BASE_ANDROID_SCOPED_JAVA_REF_H_ | 215 #endif // BASE_ANDROID_SCOPED_JAVA_REF_H_ |
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