| // Copyright (c) 2012 The Chromium Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| #include "base/supports_user_data.h" |
| |
| namespace base { |
| |
| SupportsUserData::SupportsUserData() { |
| // Harmless to construct on a different thread to subsequent usage. |
| thread_checker_.DetachFromThread(); |
| } |
| |
| SupportsUserData::Data* SupportsUserData::GetUserData(const void* key) const { |
| DCHECK(thread_checker_.CalledOnValidThread()); |
| DataMap::const_iterator found = user_data_.find(key); |
| if (found != user_data_.end()) |
| return found->second.get(); |
| return NULL; |
| } |
| |
| void SupportsUserData::SetUserData(const void* key, Data* data) { |
| DCHECK(thread_checker_.CalledOnValidThread()); |
| user_data_[key] = linked_ptr<Data>(data); |
| } |
| |
| void SupportsUserData::RemoveUserData(const void* key) { |
| DCHECK(thread_checker_.CalledOnValidThread()); |
| user_data_.erase(key); |
| } |
| |
| void SupportsUserData::DetachUserDataThread() { |
| thread_checker_.DetachFromThread(); |
| } |
| |
| SupportsUserData::~SupportsUserData() { |
| DCHECK(thread_checker_.CalledOnValidThread() || user_data_.empty()); |
| DataMap local_user_data; |
| user_data_.swap(local_user_data); |
| // Now this->user_data_ is empty, and any destructors called transitively from |
| // the destruction of |local_user_data| will see it that way instead of |
| // examining a being-destroyed object. |
| } |
| |
| } // namespace base |