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
3 // found in the LICENSE file.
4
5 #include "base/android/scoped_java_ref.h"
6
7 #include "base/android/jni_android.h"
8 #include "base/logging.h"
9
10 namespace base {
11 namespace android {
12 namespace {
13
14 const int kDefaultLocalFrameCapacity = 16;
15
16 } // namespace
17
ScopedJavaLocalFrame(JNIEnv * env)18 ScopedJavaLocalFrame::ScopedJavaLocalFrame(JNIEnv* env) : env_(env) {
19 int failed = env_->PushLocalFrame(kDefaultLocalFrameCapacity);
20 DCHECK(!failed);
21 }
22
ScopedJavaLocalFrame(JNIEnv * env,int capacity)23 ScopedJavaLocalFrame::ScopedJavaLocalFrame(JNIEnv* env, int capacity)
24 : env_(env) {
25 int failed = env_->PushLocalFrame(capacity);
26 DCHECK(!failed);
27 }
28
~ScopedJavaLocalFrame()29 ScopedJavaLocalFrame::~ScopedJavaLocalFrame() {
30 env_->PopLocalFrame(nullptr);
31 }
32
33 #if DCHECK_IS_ON()
34 // This constructor is inlined when DCHECKs are disabled; don't add anything
35 // else here.
JavaRef(JNIEnv * env,jobject obj)36 JavaRef<jobject>::JavaRef(JNIEnv* env, jobject obj) : obj_(obj) {
37 if (obj) {
38 DCHECK(env && env->GetObjectRefType(obj) == JNILocalRefType);
39 }
40 }
41 #endif
42
SetNewLocalRef(JNIEnv * env,jobject obj)43 JNIEnv* JavaRef<jobject>::SetNewLocalRef(JNIEnv* env, jobject obj) {
44 if (!env) {
45 env = AttachCurrentThread();
46 } else {
47 DCHECK_EQ(env, AttachCurrentThread()); // Is |env| on correct thread.
48 }
49 if (obj)
50 obj = env->NewLocalRef(obj);
51 if (obj_)
52 env->DeleteLocalRef(obj_);
53 obj_ = obj;
54 return env;
55 }
56
SetNewGlobalRef(JNIEnv * env,jobject obj)57 void JavaRef<jobject>::SetNewGlobalRef(JNIEnv* env, jobject obj) {
58 if (!env) {
59 env = AttachCurrentThread();
60 } else {
61 DCHECK_EQ(env, AttachCurrentThread()); // Is |env| on correct thread.
62 }
63 if (obj)
64 obj = env->NewGlobalRef(obj);
65 if (obj_)
66 env->DeleteGlobalRef(obj_);
67 obj_ = obj;
68 }
69
ResetLocalRef(JNIEnv * env)70 void JavaRef<jobject>::ResetLocalRef(JNIEnv* env) {
71 if (obj_) {
72 DCHECK_EQ(env, AttachCurrentThread()); // Is |env| on correct thread.
73 env->DeleteLocalRef(obj_);
74 obj_ = nullptr;
75 }
76 }
77
ResetGlobalRef()78 void JavaRef<jobject>::ResetGlobalRef() {
79 if (obj_) {
80 AttachCurrentThread()->DeleteGlobalRef(obj_);
81 obj_ = nullptr;
82 }
83 }
84
ReleaseInternal()85 jobject JavaRef<jobject>::ReleaseInternal() {
86 jobject obj = obj_;
87 obj_ = nullptr;
88 return obj;
89 }
90
91 } // namespace android
92 } // namespace base
93