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      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 
     18 ScopedJavaLocalFrame::ScopedJavaLocalFrame(JNIEnv* env) : env_(env) {
     19   int failed = env_->PushLocalFrame(kDefaultLocalFrameCapacity);
     20   DCHECK(!failed);
     21 }
     22 
     23 ScopedJavaLocalFrame::ScopedJavaLocalFrame(JNIEnv* env, int capacity)
     24     : env_(env) {
     25   int failed = env_->PushLocalFrame(capacity);
     26   DCHECK(!failed);
     27 }
     28 
     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.
     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 
     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 
     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 
     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 
     78 void JavaRef<jobject>::ResetGlobalRef() {
     79   if (obj_) {
     80     AttachCurrentThread()->DeleteGlobalRef(obj_);
     81     obj_ = nullptr;
     82   }
     83 }
     84 
     85 jobject JavaRef<jobject>::ReleaseInternal() {
     86   jobject obj = obj_;
     87   obj_ = NULL;
     88   return obj;
     89 }
     90 
     91 }  // namespace android
     92 }  // namespace base
     93