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 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