base/android/scoped_java_ref.cc

   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 #if DCHECK_IS_ON()
  32 // This constructor is inlined when DCHECKs are disabled; don't add anything
  33 // else here.
  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
  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
  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
  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
  76 void JavaRef<jobject>::ResetGlobalRef() {
  77   if (obj_) {
  78     AttachCurrentThread()->DeleteGlobalRef(obj_);
  79     obj_ = NULL;
  80   }
  81 }
  82
  83 jobject JavaRef<jobject>::ReleaseInternal() {
  84   jobject obj = obj_;
  85   obj_ = NULL;
  86   return obj;
  87 }
  88
  89 }  // namespace android
  90 }  // namespace base