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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() { env_->PopLocalFrame(NULL); }
     30 
     31 JavaRef<jobject>::JavaRef() : obj_(NULL) {}
     32 
     33 JavaRef<jobject>::JavaRef(JNIEnv* env, jobject obj) : obj_(obj) {
     34   if (obj) {
     35     DCHECK(env && env->GetObjectRefType(obj) == JNILocalRefType);
     36   }
     37 }
     38 
     39 JavaRef<jobject>::~JavaRef() {
     40 }
     41 
     42 JNIEnv* JavaRef<jobject>::SetNewLocalRef(JNIEnv* env, jobject obj) {
     43   if (!env) {
     44     env = AttachCurrentThread();
     45   } else {
     46     DCHECK_EQ(env, AttachCurrentThread());  // Is |env| on correct thread.
     47   }
     48   if (obj)
     49     obj = env->NewLocalRef(obj);
     50   if (obj_)
     51     env->DeleteLocalRef(obj_);
     52   obj_ = obj;
     53   return env;
     54 }
     55 
     56 void JavaRef<jobject>::SetNewGlobalRef(JNIEnv* env, jobject obj) {
     57   if (!env) {
     58     env = AttachCurrentThread();
     59   } else {
     60     DCHECK_EQ(env, AttachCurrentThread());  // Is |env| on correct thread.
     61   }
     62   if (obj)
     63     obj = env->NewGlobalRef(obj);
     64   if (obj_)
     65     env->DeleteGlobalRef(obj_);
     66   obj_ = obj;
     67 }
     68 
     69 void JavaRef<jobject>::ResetLocalRef(JNIEnv* env) {
     70   if (obj_) {
     71     DCHECK_EQ(env, AttachCurrentThread());  // Is |env| on correct thread.
     72     env->DeleteLocalRef(obj_);
     73     obj_ = NULL;
     74   }
     75 }
     76 
     77 void JavaRef<jobject>::ResetGlobalRef() {
     78   if (obj_) {
     79     AttachCurrentThread()->DeleteGlobalRef(obj_);
     80     obj_ = NULL;
     81   }
     82 }
     83 
     84 jobject JavaRef<jobject>::ReleaseInternal() {
     85   jobject obj = obj_;
     86   obj_ = NULL;
     87   return obj;
     88 }
     89 
     90 }  // namespace android
     91 }  // namespace base
     92