Merge CrossFileUtilHelper to FileUtilHelper as Copy() and Move().

webkit/fileapi/cross_file_util_helper.cc

-// 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 "webkit/fileapi/cross_file_util_helper.h"
-
-#include "webkit/fileapi/file_system_file_util.h"
-#include "webkit/fileapi/file_system_operation_context.h"
-#include "webkit/fileapi/file_system_path.h"
-#include "webkit/fileapi/file_util_helper.h"
-
-using base::PlatformFileError;
-
-namespace fileapi {
-
-CrossFileUtilHelper::CrossFileUtilHelper(
-    FileSystemOperationContext* context,
-    FileSystemFileUtil* src_util,
-    FileSystemFileUtil* dest_util,
-    const FileSystemPath& src_path,
-    const FileSystemPath& dest_path,
-    Operation operation)
-    : context_(context),
-      src_util_(src_util),
-      dest_util_(dest_util),
-      src_root_path_(src_path),
-      dest_root_path_(dest_path),
-      operation_(operation) {}
-
-CrossFileUtilHelper::~CrossFileUtilHelper() {}
-
-base::PlatformFileError CrossFileUtilHelper::DoWork() {
-  base::PlatformFileError error =
-      PerformErrorCheckAndPreparationForMoveAndCopy();
-  if (error != base::PLATFORM_FILE_OK)
-    return error;
-  if (src_util_->DirectoryExists(context_, src_root_path_)) {
-    return CopyOrMoveDirectory(src_root_path_, dest_root_path_);
-  }
-  return CopyOrMoveFile(src_root_path_, dest_root_path_);
-}
-
-PlatformFileError
-CrossFileUtilHelper::PerformErrorCheckAndPreparationForMoveAndCopy() {
-  // Exits earlier if the source path does not exist.
-  if (!src_util_->PathExists(context_, src_root_path_))
-    return base::PLATFORM_FILE_ERROR_NOT_FOUND;
-
-  bool same_file_system =
-      (src_root_path_.origin() == dest_root_path_.origin()) &&
-      (src_root_path_.type() == dest_root_path_.type());
-
-  // The parent of the |dest_root_path_| does not exist.
-  if (!ParentExists(dest_root_path_, dest_util_))
-    return base::PLATFORM_FILE_ERROR_NOT_FOUND;
-
-  // It is an error to try to copy/move an entry into its child.
-  if (same_file_system && src_root_path_.IsParent(dest_root_path_))
-    return base::PLATFORM_FILE_ERROR_INVALID_OPERATION;
-
-  // Now it is ok to return if the |dest_root_path_| does not exist.
-  if (!dest_util_->PathExists(context_, dest_root_path_))
-    return base::PLATFORM_FILE_OK;
-
-  // |src_root_path_| exists and is a directory.
-  // |dest_root_path_| exists and is a file.
-  bool src_is_directory = src_util_->DirectoryExists(context_, src_root_path_);
-  bool dest_is_directory =
-      dest_util_->DirectoryExists(context_, dest_root_path_);
-
-  // Either one of |src_root_path_| or |dest_root_path_| is directory,
-  // while the other is not.
-  if (src_is_directory != dest_is_directory)
-    return base::PLATFORM_FILE_ERROR_INVALID_OPERATION;
-
-  // It is an error to copy/move an entry into the same path.
-  if (same_file_system && (src_root_path_.internal_path() ==
-                           dest_root_path_.internal_path()))
-    return base::PLATFORM_FILE_ERROR_EXISTS;
-
-  if (dest_is_directory) {
-    // It is an error to copy/move an entry to a non-empty directory.
-    // Otherwise the copy/move attempt must overwrite the destination, but
-    // the file_util's Copy or Move method doesn't perform overwrite
-    // on all platforms, so we delete the destination directory here.
-    if (base::PLATFORM_FILE_OK !=
-        dest_util_->DeleteSingleDirectory(context_, dest_root_path_)) {
-      if (!dest_util_->IsDirectoryEmpty(context_, dest_root_path_))
-        return base::PLATFORM_FILE_ERROR_NOT_EMPTY;
-      return base::PLATFORM_FILE_ERROR_FAILED;
-    }
-  }
-  return base::PLATFORM_FILE_OK;
-}
-
-bool CrossFileUtilHelper::ParentExists(
-    const FileSystemPath& path, FileSystemFileUtil* file_util) {
-  // If path is in the root, path.DirName() will be ".",
-  // since we use paths with no leading '/'.
-  FilePath parent = path.internal_path().DirName();
-  if (parent == FilePath(FILE_PATH_LITERAL(".")))
-    return true;
-  return file_util->DirectoryExists(
-      context_, path.WithInternalPath(parent));
-}
-
-PlatformFileError CrossFileUtilHelper::CopyOrMoveDirectory(
-    const FileSystemPath& src_path,
-    const FileSystemPath& dest_path) {
-  // At this point we must have gone through
-  // PerformErrorCheckAndPreparationForMoveAndCopy so this must be true.
-  DCHECK(!((src_path.origin() == dest_path.origin()) &&
-           (src_path.type() == dest_path.type())) ||
-         !src_path.IsParent(dest_path));
-
-  PlatformFileError error = dest_util_->CreateDirectory(
-      context_, dest_path, false, false);
-  if (error != base::PLATFORM_FILE_OK)
-    return error;
-
-  scoped_ptr<FileSystemFileUtil::AbstractFileEnumerator> file_enum(
-      src_util_->CreateFileEnumerator(context_, src_path));
-  FilePath src_file_path_each;
-  while (!(src_file_path_each = file_enum->Next()).empty()) {
-    FilePath dest_file_path_each(dest_path.internal_path());
-    src_path.internal_path().AppendRelativePath(
-        src_file_path_each, &dest_file_path_each);
-
-    if (file_enum->IsDirectory()) {
-      PlatformFileError error = dest_util_->CreateDirectory(
-          context_,
-          dest_path.WithInternalPath(dest_file_path_each),
-          true /* exclusive */, false /* recursive */);
-      if (error != base::PLATFORM_FILE_OK)
-        return error;
-    } else {
-      PlatformFileError error = CopyOrMoveFile(
-          src_path.WithInternalPath(src_file_path_each),
-          dest_path.WithInternalPath(dest_file_path_each));
-      if (error != base::PLATFORM_FILE_OK)
-        return error;
-    }
-  }
-
-  if (operation_ == OPERATION_MOVE) {
-    PlatformFileError error =
-        FileUtilHelper::Delete(context_, src_util_,
-                               src_path, true /* recursive */);
-    if (error != base::PLATFORM_FILE_OK)
-      return error;
-  }
-
-  return base::PLATFORM_FILE_OK;
-}
-
-PlatformFileError CrossFileUtilHelper::CopyOrMoveFile(
-    const FileSystemPath& src_path,
-    const FileSystemPath& dest_path) {
-  if ((src_path.origin() == dest_path.origin()) &&
-      (src_path.type() == dest_path.type())) {
-    DCHECK(src_util_ == dest_util_);
-    // Source and destination are in the same FileSystemFileUtil; now we can
-    // safely call FileSystemFileUtil method on src_util_ (== dest_util_).
-    return src_util_->CopyOrMoveFile(context_, src_path, dest_path,
-                                     operation_ == OPERATION_COPY);
-  }
-
-  // Resolve the src_path's underlying file path.
-  base::PlatformFileInfo file_info;
-  FilePath platform_file_path;
-  PlatformFileError error = src_util_->GetFileInfo(
-      context_, src_path, &file_info, &platform_file_path);
-  if (error != base::PLATFORM_FILE_OK)
-    return error;
-
-  // Call CopyInForeignFile() on the dest_util_ with the resolved source path
-  // to perform limited cross-FileSystemFileUtil copy/move.
-  error = dest_util_->CopyInForeignFile(
-      context_, src_path.WithInternalPath(platform_file_path), dest_path);
-
-  if (operation_ == OPERATION_COPY || error != base::PLATFORM_FILE_OK)
-    return error;
-  return src_util_->DeleteFile(context_, src_path);
-}
-
-}  // namespace fileapi