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() { env_->PopLocalFrame(NULL); }
30
31 #if DCHECK_IS_ON()
32 // This constructor is inlined when DCHECKs are disabled; don't add anything
33 // else here.
JavaRef(JNIEnv * env,jobject obj)34 JavaRef<jobject>::JavaRef(JNIEnv* env, jobject obj) : obj_(obj) {
35 if (obj) {
36 DCHECK(env && env->GetObjectRefType(obj) == JNILocalRefType);
37 }
38 }
39 #endif
40
SetNewLocalRef(JNIEnv * env,jobject obj)41 JNIEnv* JavaRef<jobject>::SetNewLocalRef(JNIEnv* env, jobject obj) {
42 if (!env) {
43 env = AttachCurrentThread();
44 } else {
45 DCHECK_EQ(env, AttachCurrentThread()); // Is |env| on correct thread.
46 }
47 if (obj)
48 obj = env->NewLocalRef(obj);
49 if (obj_)
50 env->DeleteLocalRef(obj_);
51 obj_ = obj;
52 return env;
53 }
54
SetNewGlobalRef(JNIEnv * env,jobject obj)55 void JavaRef<jobject>::SetNewGlobalRef(JNIEnv* env, jobject obj) {
56 if (!env) {
57 env = AttachCurrentThread();
58 } else {
59 DCHECK_EQ(env, AttachCurrentThread()); // Is |env| on correct thread.
60 }
61 if (obj)
62 obj = env->NewGlobalRef(obj);
63 if (obj_)
64 env->DeleteGlobalRef(obj_);
65 obj_ = obj;
66 }
67
ResetLocalRef(JNIEnv * env)68 void JavaRef<jobject>::ResetLocalRef(JNIEnv* env) {
69 if (obj_) {
70 DCHECK_EQ(env, AttachCurrentThread()); // Is |env| on correct thread.
71 env->DeleteLocalRef(obj_);
72 obj_ = NULL;
73 }
74 }
75
ResetGlobalRef()76 void JavaRef<jobject>::ResetGlobalRef() {
77 if (obj_) {
78 AttachCurrentThread()->DeleteGlobalRef(obj_);
79 obj_ = NULL;
80 }
81 }
82
ReleaseInternal()83 jobject JavaRef<jobject>::ReleaseInternal() {
84 jobject obj = obj_;
85 obj_ = NULL;
86 return obj;
87 }
88
89 } // namespace android
90 } // namespace base
91