[Storage] Blob Storage Refactoring pt 1

storage/common/blob/scoped_file.cc

-// Copyright (c) 2013 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 "storage/common/blob/scoped_file.h"
-
-#include "base/bind.h"
-#include "base/callback.h"
-#include "base/files/file_util.h"
-#include "base/location.h"
-#include "base/message_loop/message_loop_proxy.h"
-#include "base/task_runner.h"
-
-namespace storage {
-
-ScopedFile::ScopedFile()
-    : scope_out_policy_(DONT_DELETE_ON_SCOPE_OUT) {
-}
-
-ScopedFile::ScopedFile(const base::FilePath& path,
-                       ScopeOutPolicy policy,
-                       const scoped_refptr<base::TaskRunner>& file_task_runner)
-    : path_(path),
-      scope_out_policy_(policy),
-      file_task_runner_(file_task_runner) {
-  DCHECK(path.empty() || policy != DELETE_ON_SCOPE_OUT ||
-         file_task_runner.get())
-      << "path:" << path.value() << " policy:" << policy
-      << " runner:" << file_task_runner.get();
-}
-
-ScopedFile::ScopedFile(RValue other) {
-  MoveFrom(*other.object);
-}
-
-ScopedFile::~ScopedFile() {
-  Reset();
-}
-
-void ScopedFile::AddScopeOutCallback(
-    const ScopeOutCallback& callback,
-    base::TaskRunner* callback_runner) {
-  if (!callback_runner)
-    callback_runner = base::MessageLoopProxy::current().get();
-  scope_out_callbacks_.push_back(std::make_pair(callback, callback_runner));
-}
-
-base::FilePath ScopedFile::Release() {
-  base::FilePath path = path_;
-  path_.clear();
-  scope_out_callbacks_.clear();
-  scope_out_policy_ = DONT_DELETE_ON_SCOPE_OUT;
-  return path;
-}
-
-void ScopedFile::Reset() {
-  if (path_.empty())
-    return;
-
-  for (ScopeOutCallbackList::iterator iter = scope_out_callbacks_.begin();
-       iter != scope_out_callbacks_.end(); ++iter) {
-    iter->second->PostTask(FROM_HERE, base::Bind(iter->first, path_));
-  }
-
-  if (scope_out_policy_ == DELETE_ON_SCOPE_OUT) {
-    file_task_runner_->PostTask(
-        FROM_HERE,
-        base::Bind(base::IgnoreResult(&base::DeleteFile),
-                   path_, false /* recursive */));
-  }
-
-  // Clear all fields.
-  Release();
-}
-
-void ScopedFile::MoveFrom(ScopedFile& other) {
-  Reset();
-
-  scope_out_policy_ = other.scope_out_policy_;
-  scope_out_callbacks_.swap(other.scope_out_callbacks_);
-  file_task_runner_ = other.file_task_runner_;
-  path_ = other.Release();
-}
-
-}  // namespace storage