root/chrome/browser/chromeos/drive/file_system/create_directory_operation.cc

DEFINITIONS

1. CreateDirectoryRecursively
2. UpdateLocalState
3. weak_ptr_factory_
4. CreateDirectoryAfterUpdateLocalState

// 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 "chrome/browser/chromeos/drive/file_system/create_directory_operation.h"

#include "chrome/browser/chromeos/drive/drive.pb.h"
#include "chrome/browser/chromeos/drive/file_system/operation_observer.h"
#include "chrome/browser/chromeos/drive/file_system_util.h"
#include "chrome/browser/chromeos/drive/resource_metadata.h"
#include "content/public/browser/browser_thread.h"

using content::BrowserThread;

namespace drive {
namespace file_system {

namespace {

FileError CreateDirectoryRecursively(
    internal::ResourceMetadata* metadata,
    const std::string& parent_local_id,
    const base::FilePath& relative_file_path,
    std::set<std::string>* updated_local_ids,
    std::set<base::FilePath>* changed_directories) {
  // Split the first component and remaining ones of |relative_file_path|.
  std::vector<base::FilePath::StringType> components;
  relative_file_path.GetComponents(&components);
  DCHECK(!components.empty());
  base::FilePath title(components[0]);
  base::FilePath remaining_path;
  title.AppendRelativePath(relative_file_path, &remaining_path);

  ResourceEntry entry;
  const base::Time now = base::Time::Now();
  entry.set_title(title.AsUTF8Unsafe());
  entry.mutable_file_info()->set_is_directory(true);
  entry.mutable_file_info()->set_last_modified(now.ToInternalValue());
  entry.mutable_file_info()->set_last_accessed(now.ToInternalValue());
  entry.set_parent_local_id(parent_local_id);
  entry.set_metadata_edit_state(ResourceEntry::DIRTY);

  std::string local_id;
  FileError error = metadata->AddEntry(entry, &local_id);
  if (error != FILE_ERROR_OK)
    return error;

  updated_local_ids->insert(local_id);
  changed_directories->insert(metadata->GetFilePath(local_id).DirName());

  if (remaining_path.empty())  // All directories are created successfully.
    return FILE_ERROR_OK;

  // Create descendant directories.
  return CreateDirectoryRecursively(metadata, local_id, remaining_path,
                                    updated_local_ids, changed_directories);
}

FileError UpdateLocalState(internal::ResourceMetadata* metadata,
                           const base::FilePath& directory_path,
                           bool is_exclusive,
                           bool is_recursive,
                           std::set<std::string>* updated_local_ids,
                           std::set<base::FilePath>* changed_directories) {
  // Get the existing deepest entry.
  std::vector<base::FilePath::StringType> components;
  directory_path.GetComponents(&components);

  if (components.empty() || components[0] != util::kDriveGrandRootDirName)
    return FILE_ERROR_NOT_FOUND;

  base::FilePath existing_deepest_path(components[0]);
  std::string local_id = util::kDriveGrandRootLocalId;
  for (size_t i = 1; i < components.size(); ++i) {
    std::string child_local_id = metadata->GetChildId(local_id, components[i]);
    if (child_local_id.empty())
      break;
    existing_deepest_path = existing_deepest_path.Append(components[i]);
    local_id = child_local_id;
  }

  ResourceEntry entry;
  FileError error = metadata->GetResourceEntryById(local_id, &entry);
  if (error != FILE_ERROR_OK)
    return error;

  if (!entry.file_info().is_directory())
    return FILE_ERROR_NOT_A_DIRECTORY;

  if (directory_path == existing_deepest_path)
    return is_exclusive ? FILE_ERROR_EXISTS : FILE_ERROR_OK;

  // If it is not recursive creation, the found directory must be the direct
  // parent of |directory_path| to ensure creating exact one directory.
  if (!is_recursive && existing_deepest_path != directory_path.DirName())
    return FILE_ERROR_NOT_FOUND;

  // Create directories under the found directory.
  base::FilePath remaining_path;
  existing_deepest_path.AppendRelativePath(directory_path, &remaining_path);
  return CreateDirectoryRecursively(metadata, entry.local_id(), remaining_path,
                                    updated_local_ids, changed_directories);
}

}  // namespace

CreateDirectoryOperation::CreateDirectoryOperation(
    base::SequencedTaskRunner* blocking_task_runner,
    OperationObserver* observer,
    internal::ResourceMetadata* metadata)
    : blocking_task_runner_(blocking_task_runner),
      observer_(observer),
      metadata_(metadata),
      weak_ptr_factory_(this) {
  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
}

CreateDirectoryOperation::~CreateDirectoryOperation() {
  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
}

void CreateDirectoryOperation::CreateDirectory(
    const base::FilePath& directory_path,
    bool is_exclusive,
    bool is_recursive,
    const FileOperationCallback& callback) {
  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
  DCHECK(!callback.is_null());

  std::set<std::string>* updated_local_ids = new std::set<std::string>;
  std::set<base::FilePath>* changed_directories = new std::set<base::FilePath>;
  base::PostTaskAndReplyWithResult(
      blocking_task_runner_.get(),
      FROM_HERE,
      base::Bind(&UpdateLocalState,
                 metadata_, directory_path, is_exclusive, is_recursive,
                 updated_local_ids, changed_directories),
      base::Bind(&CreateDirectoryOperation::
                     CreateDirectoryAfterUpdateLocalState,
                 weak_ptr_factory_.GetWeakPtr(),
                 callback,
                 base::Owned(updated_local_ids),
                 base::Owned(changed_directories)));
}

void CreateDirectoryOperation::CreateDirectoryAfterUpdateLocalState(
      const FileOperationCallback& callback,
      const std::set<std::string>* updated_local_ids,
      const std::set<base::FilePath>* changed_directories,
      FileError error) {
  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
  DCHECK(!callback.is_null());

  for (std::set<std::string>::const_iterator it = updated_local_ids->begin();
       it != updated_local_ids->end(); ++it)
    observer_->OnEntryUpdatedByOperation(*it);

  for (std::set<base::FilePath>::const_iterator it =
           changed_directories->begin(); it != changed_directories->end(); ++it)
    observer_->OnDirectoryChangedByOperation(*it);

  callback.Run(error);
}

}  // namespace file_system
}  // namespace drive