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// 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.
#ifndef WEBKIT_FILEAPI_FILE_SYSTEM_FILE_UTIL_H_
#define WEBKIT_FILEAPI_FILE_SYSTEM_FILE_UTIL_H_
#include "base/file_path.h"
#include "base/file_util_proxy.h"
#include "base/platform_file.h"
#include "webkit/fileapi/file_system_url.h"
#include "webkit/fileapi/fileapi_export.h"
namespace base {
class Time;
}
namespace fileapi {
using base::PlatformFile;
using base::PlatformFileError;
class FileSystemOperationContext;
// A file utility interface that provides basic file utility methods for
// FileSystem API.
//
// Layering structure of the FileSystemFileUtil was split out.
// See http://crbug.com/128136 if you need it.
class FILEAPI_EXPORT FileSystemFileUtil {
public:
// It will be implemented by each subclass such as FileSystemFileEnumerator.
class AbstractFileEnumerator {
public:
virtual ~AbstractFileEnumerator() {}
// Returns an empty string if there are no more results.
virtual FilePath Next() = 0;
virtual int64 Size() = 0;
virtual base::Time LastModifiedTime() = 0;
virtual bool IsDirectory() = 0;
};
class EmptyFileEnumerator : public AbstractFileEnumerator {
virtual FilePath Next() OVERRIDE { return FilePath(); }
virtual int64 Size() OVERRIDE { return 0; }
virtual base::Time LastModifiedTime() OVERRIDE { return base::Time(); }
virtual bool IsDirectory() OVERRIDE { return false; }
};
virtual ~FileSystemFileUtil() {}
// Creates or opens a file with the given flags.
// If PLATFORM_FILE_CREATE is set in |file_flags| it always tries to create
// a new file at the given |url| and calls back with
// PLATFORM_FILE_ERROR_FILE_EXISTS if the |url| already exists.
virtual PlatformFileError CreateOrOpen(
FileSystemOperationContext* context,
const FileSystemURL& url,
int file_flags,
PlatformFile* file_handle,
bool* created) = 0;
// Closes the given file handle.
virtual PlatformFileError Close(
FileSystemOperationContext* context,
PlatformFile file) = 0;
// Ensures that the given |url| exist. This creates a empty new file
// at |url| if the |url| does not exist.
// If a new file han not existed and is created at the |url|,
// |created| is set true and |error code|
// is set PLATFORM_FILE_OK.
// If the file already exists, |created| is set false and |error code|
// is set PLATFORM_FILE_OK.
// If the file hasn't existed but it couldn't be created for some other
// reasons, |created| is set false and |error code| indicates the error.
virtual PlatformFileError EnsureFileExists(
FileSystemOperationContext* context,
const FileSystemURL& url, bool* created) = 0;
// Creates directory at given url. It's an error to create
// if |exclusive| is true and dir already exists.
virtual PlatformFileError CreateDirectory(
FileSystemOperationContext* context,
const FileSystemURL& url,
bool exclusive,
bool recursive) = 0;
// Retrieves the information about a file.
virtual PlatformFileError GetFileInfo(
FileSystemOperationContext* context,
const FileSystemURL& url,
base::PlatformFileInfo* file_info,
FilePath* platform_path) = 0;
// Returns a pointer to a new instance of AbstractFileEnumerator which is
// implemented for each FileSystemFileUtil subclass. The instance needs to be
// freed by the caller, and its lifetime should not extend past when the
// current call returns to the main FILE message loop.
//
// The supplied context must remain valid at least lifetime of the enumerator
// instance.
virtual AbstractFileEnumerator* CreateFileEnumerator(
FileSystemOperationContext* context,
const FileSystemURL& root_url,
bool recursive) = 0;
// Maps |file_system_url| given |context| into |local_file_path|
// which represents physical file location on the host OS.
// This may not always make sense for all subclasses.
virtual PlatformFileError GetLocalFilePath(
FileSystemOperationContext* context,
const FileSystemURL& file_system_url,
FilePath* local_file_path) = 0;
// Updates the file metadata information. Unlike posix's touch, it does
// not create a file even if |url| does not exist, but instead fails
// with PLATFORM_FILE_ERROR_NOT_FOUND.
virtual PlatformFileError Touch(
FileSystemOperationContext* context,
const FileSystemURL& url,
const base::Time& last_access_time,
const base::Time& last_modified_time) = 0;
// Truncates a file to the given length. If |length| is greater than the
// current length of the file, the file will be extended with zeroes.
virtual PlatformFileError Truncate(
FileSystemOperationContext* context,
const FileSystemURL& url,
int64 length) = 0;
// Returns true if a given |url| exists.
virtual bool PathExists(
FileSystemOperationContext* context,
const FileSystemURL& url) = 0;
// Returns true if a given |url| exists and is a directory.
virtual bool DirectoryExists(
FileSystemOperationContext* context,
const FileSystemURL& url) = 0;
// Returns true if a given |url| is an empty directory.
virtual bool IsDirectoryEmpty(
FileSystemOperationContext* context,
const FileSystemURL& url) = 0;
// Copies or moves a single file from |src_url| to |dest_url|.
virtual PlatformFileError CopyOrMoveFile(
FileSystemOperationContext* context,
const FileSystemURL& src_url,
const FileSystemURL& dest_url,
bool copy) = 0;
// Copies in a single file from a different filesystem.
virtual PlatformFileError CopyInForeignFile(
FileSystemOperationContext* context,
const FilePath& src_file_path,
const FileSystemURL& dest_url) = 0;
// Deletes a single file.
// It assumes the given url points a file.
virtual PlatformFileError DeleteFile(
FileSystemOperationContext* context,
const FileSystemURL& url) = 0;
// Deletes a single empty directory.
// It assumes the given url points an empty directory.
virtual PlatformFileError DeleteSingleDirectory(
FileSystemOperationContext* context,
const FileSystemURL& url) = 0;
protected:
FileSystemFileUtil() {}
private:
DISALLOW_COPY_AND_ASSIGN(FileSystemFileUtil);
};
} // namespace fileapi
#endif // WEBKIT_FILEAPI_FILE_SYSTEM_FILE_UTIL_H_
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