1// Copyright 2014 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/jni_weak_ref.h" 6 7#include <utility> 8 9#include "base/android/jni_android.h" 10#include "base/logging.h" 11 12using base::android::AttachCurrentThread; 13 14JavaObjectWeakGlobalRef::JavaObjectWeakGlobalRef() : obj_(nullptr) {} 15 16JavaObjectWeakGlobalRef::JavaObjectWeakGlobalRef( 17 const JavaObjectWeakGlobalRef& orig) 18 : obj_(nullptr) { 19 Assign(orig); 20} 21 22JavaObjectWeakGlobalRef::JavaObjectWeakGlobalRef(JavaObjectWeakGlobalRef&& orig) 23 : obj_(orig.obj_) { 24 orig.obj_ = nullptr; 25} 26 27JavaObjectWeakGlobalRef::JavaObjectWeakGlobalRef(JNIEnv* env, jobject obj) 28 : obj_(env->NewWeakGlobalRef(obj)) { 29} 30 31JavaObjectWeakGlobalRef::JavaObjectWeakGlobalRef( 32 JNIEnv* env, 33 const base::android::JavaRef<jobject>& obj) 34 : obj_(env->NewWeakGlobalRef(obj.obj())) { 35} 36 37JavaObjectWeakGlobalRef::~JavaObjectWeakGlobalRef() { 38 reset(); 39} 40 41void JavaObjectWeakGlobalRef::operator=(const JavaObjectWeakGlobalRef& rhs) { 42 Assign(rhs); 43} 44 45void JavaObjectWeakGlobalRef::operator=(JavaObjectWeakGlobalRef&& rhs) { 46 std::swap(obj_, rhs.obj_); 47} 48 49void JavaObjectWeakGlobalRef::reset() { 50 if (obj_) { 51 AttachCurrentThread()->DeleteWeakGlobalRef(obj_); 52 obj_ = nullptr; 53 } 54} 55 56base::android::ScopedJavaLocalRef<jobject> 57 JavaObjectWeakGlobalRef::get(JNIEnv* env) const { 58 return GetRealObject(env, obj_); 59} 60 61base::android::ScopedJavaLocalRef<jobject> GetRealObject( 62 JNIEnv* env, jweak obj) { 63 jobject real = nullptr; 64 if (obj) 65 real = env->NewLocalRef(obj); 66 return base::android::ScopedJavaLocalRef<jobject>(env, real); 67} 68 69void JavaObjectWeakGlobalRef::Assign(const JavaObjectWeakGlobalRef& other) { 70 if (&other == this) 71 return; 72 73 JNIEnv* env = AttachCurrentThread(); 74 if (obj_) 75 env->DeleteWeakGlobalRef(obj_); 76 77 obj_ = other.obj_ ? env->NewWeakGlobalRef(other.obj_) : nullptr; 78} 79