Move storage-related files from webkit/ to new top-level directory storage/

webkit/browser/fileapi/file_system_operation.h

Index: webkit/browser/fileapi/file_system_operation.h
diff --git a/webkit/browser/fileapi/file_system_operation.h b/webkit/browser/fileapi/file_system_operation.h
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index 4261a2bd39a8aae759caaec9db4b60e104c4975d..0000000000000000000000000000000000000000
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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_BROWSER_FILEAPI_FILE_SYSTEM_OPERATION_H_
-#define WEBKIT_BROWSER_FILEAPI_FILE_SYSTEM_OPERATION_H_
-
-#include <vector>
-
-#include "base/callback.h"
-#include "base/files/file.h"
-#include "base/files/file_path.h"
-#include "base/process/process.h"
-#include "webkit/browser/fileapi/file_system_operation_context.h"
-#include "webkit/browser/webkit_storage_browser_export.h"
-#include "webkit/common/fileapi/directory_entry.h"
-
-namespace base {
-class Time;
-}
-
-namespace net {
-class URLRequest;
-}
-
-namespace webkit_blob {
-class ShareableFileReference;
-}
-
-class GURL;
-
-namespace fileapi {
-
-class FileSystemContext;
-class FileSystemURL;
-class FileWriterDelegate;
-
-// The interface class for FileSystemOperation implementations.
-//
-// This interface defines file system operations required to implement
-// "File API: Directories and System"
-// http://www.w3.org/TR/file-system-api/
-//
-// DESIGN NOTES
-//
-// This class is designed to
-//
-// 1) Serve one-time file system operation per instance.  Only one
-// method(CreateFile, CreateDirectory, Copy, Move, DirectoryExists,
-// GetMetadata, ReadDirectory and Remove) may be called during the
-// lifetime of this object and it should be called no more than once.
-//
-// 2) Deliver the results of operations to the client via the callback function
-// passed as the last parameter of the method.
-//
-// Note that it is valid to delete an operation while it is running.
-// The callback will NOT be fired if the operation is deleted before
-// it gets called.
-class FileSystemOperation {
- public:
-  WEBKIT_STORAGE_BROWSER_EXPORT static FileSystemOperation* Create(
-      const FileSystemURL& url,
-      FileSystemContext* file_system_context,
-      scoped_ptr<FileSystemOperationContext> operation_context);
-
-  virtual ~FileSystemOperation() {}
-
-  // Used for CreateFile(), etc. |result| is the return code of the operation.
-  typedef base::Callback<void(base::File::Error result)> StatusCallback;
-
-  // Used for GetMetadata(). |result| is the return code of the operation,
-  // |file_info| is the obtained file info.
-  typedef base::Callback<
-      void(base::File::Error result,
-           const base::File::Info& file_info)> GetMetadataCallback;
-
-  // Used for OpenFile(). |on_close_callback| will be called after the file is
-  // closed in the child process. It can be null, if no operation is needed on
-  // closing a file.
-  typedef base::Callback<
-      void(base::File file,
-           const base::Closure& on_close_callback)> OpenFileCallback;
-
-  // Used for ReadDirectoryCallback.
-  typedef std::vector<DirectoryEntry> FileEntryList;
-
-  // Used for ReadDirectory(). |result| is the return code of the operation,
-  // |file_list| is the list of files read, and |has_more| is true if some files
-  // are yet to be read.
-  typedef base::Callback<
-      void(base::File::Error result,
-           const FileEntryList& file_list,
-           bool has_more)> ReadDirectoryCallback;
-
-  // Used for CreateSnapshotFile(). (Please see the comment at
-  // CreateSnapshotFile() below for how the method is called)
-  // |result| is the return code of the operation.
-  // |file_info| is the metadata of the snapshot file created.
-  // |platform_path| is the path to the snapshot file created.
-  //
-  // The snapshot file could simply be of the local file pointed by the given
-  // filesystem URL in local filesystem cases; remote filesystems
-  // may want to download the file into a temporary snapshot file and then
-  // return the metadata of the temporary file.
-  //
-  // |file_ref| is used to manage the lifetime of the returned
-  // snapshot file.  It can be set to let the chromium backend take
-  // care of the life time of the snapshot file.  Otherwise (if the returned
-  // file does not require any handling) the implementation can just
-  // return NULL.  In a more complex case, the implementaiton can manage
-  // the lifetime of the snapshot file on its own (e.g. by its cache system)
-  // but also can be notified via the reference when the file becomes no
-  // longer necessary in the javascript world.
-  // Please see the comment for ShareableFileReference for details.
-  //
-  typedef base::Callback<
-      void(base::File::Error result,
-           const base::File::Info& file_info,
-           const base::FilePath& platform_path,
-           const scoped_refptr<webkit_blob::ShareableFileReference>& file_ref)>
-          SnapshotFileCallback;
-
-  // Used for progress update callback for Copy().
-  //
-  // BEGIN_COPY_ENTRY is fired for each copy creation beginning (for both
-  // file and directory).
-  // The |source_url| is the URL of the source entry. |size| should not be
-  // used.
-  //
-  // END_COPY_ENTRY is fired for each copy creation finishing (for both
-  // file and directory).
-  // The |source_url| is the URL of the source entry. The |destination_url| is
-  // the URL of the destination entry. |size| should not be used.
-  //
-  // PROGRESS is fired periodically during file copying (not fired for
-  // directory copy).
-  // The |source_url| is the URL of the source file. |size| is the number
-  // of cumulative copied bytes for the currently copied file.
-  // Both at beginning and ending of file copying, PROGRESS event should be
-  // called. At beginning, |size| should be 0. At ending, |size| should be
-  // the size of the file.
-  //
-  // Here is an example callback sequence of recursive copy. Suppose
-  // there are a/b/c.txt (100 bytes) and a/b/d.txt (200 bytes), and trying to
-  // copy a to x recursively, then the progress update sequence will be:
-  //
-  // BEGIN_COPY_ENTRY a  (starting create "a" directory in x/).
-  // END_COPY_ENTRY a x/a (creating "a" directory in x/ is finished).
-  //
-  // BEGIN_COPY_ENTRY a/b (starting create "b" directory in x/a).
-  // END_COPY_ENTRY a/b x/a/b (creating "b" directory in x/a/ is finished).
-  //
-  // BEGIN_COPY_ENTRY a/b/c.txt (starting to copy "c.txt" in x/a/b/).
-  // PROGRESS a/b/c.txt 0 (The first PROGRESS's |size| should be 0).
-  // PROGRESS a/b/c.txt 10
-  //    :
-  // PROGRESS a/b/c.txt 90
-  // PROGRESS a/b/c.txt 100 (The last PROGRESS's |size| should be the size of
-  //                         the file).
-  // END_COPY_ENTRY a/b/c.txt x/a/b/c.txt (copying "c.txt" is finished).
-  //
-  // BEGIN_COPY_ENTRY a/b/d.txt (starting to copy "d.txt" in x/a/b).
-  // PROGRESS a/b/d.txt 0 (The first PROGRESS's |size| should be 0).
-  // PROGRESS a/b/d.txt 10
-  //    :
-  // PROGRESS a/b/d.txt 190
-  // PROGRESS a/b/d.txt 200 (The last PROGRESS's |size| should be the size of
-  //                         the file).
-  // END_COPY_ENTRY a/b/d.txt x/a/b/d.txt (copy "d.txt" is finished).
-  //
-  // Note that event sequence of a/b/c.txt and a/b/d.txt can be interlaced,
-  // because they can be done in parallel. Also PROGRESS events are optional,
-  // so they may not be appeared.
-  // All the progress callback invocation should be done before StatusCallback
-  // given to the Copy is called. Especially if an error is found before first
-  // progres callback invocation, the progress callback may NOT invoked for the
-  // copy.
-  //
-  // Note for future extension. Currently this callback is only supported on
-  // Copy(). We can extend this to Move(), because Move() is sometimes
-  // implemented as "copy then delete."
-  // In more precise, Move() usually can be implemented either 1) by updating
-  // the metadata of resource (e.g. root of moving directory tree), or 2) by
-  // copying directory tree and them removing the source tree.
-  // For 1)'s case, we can simply add BEGIN_MOVE_ENTRY and END_MOVE_ENTRY
-  // for root directory.
-  // For 2)'s case, we can add BEGIN_DELETE_ENTRY and END_DELETE_ENTRY for each
-  // entry.
-  // For both cases, we probably won't need to use PROGRESS event because
-  // these operations should be done quickly (at least much faster than copying
-  // usually).
-  enum CopyProgressType {
-    BEGIN_COPY_ENTRY,
-    END_COPY_ENTRY,
-    PROGRESS,
-  };
-  typedef base::Callback<void(CopyProgressType type,
-                              const FileSystemURL& source_url,
-                              const FileSystemURL& destination_url,
-                              int64 size)>
-      CopyProgressCallback;
-
-  // Used for CopyFileLocal() to report progress update.
-  // |size| is the cumulative copied bytes for the copy.
-  // At the beginning the progress callback should be called with |size| = 0,
-  // and also at the ending the progress callback should be called with |size|
-  // set to the copied file size.
-  typedef base::Callback<void(int64 size)> CopyFileProgressCallback;
-
-  // The option for copy or move operation.
-  enum CopyOrMoveOption {
-    // No additional operation.
-    OPTION_NONE,
-
-    // Preserves last modified time if possible. If the operation to update
-    // last modified time is not supported on the file system for the
-    // destination file, this option would be simply ignored (i.e. Copy would
-    // be successfully done without preserving last modified time).
-    OPTION_PRESERVE_LAST_MODIFIED,
-  };
-
-  // Used for Write().
-  typedef base::Callback<void(base::File::Error result,
-                              int64 bytes,
-                              bool complete)> WriteCallback;
-
-  // Creates a file at |path|. If |exclusive| is true, an error is raised
-  // in case a file is already present at the URL.
-  virtual void CreateFile(const FileSystemURL& path,
-                          bool exclusive,
-                          const StatusCallback& callback) = 0;
-
-  // Creates a directory at |path|. If |exclusive| is true, an error is
-  // raised in case a directory is already present at the URL. If
-  // |recursive| is true, create parent directories as needed just like
-  // mkdir -p does.
-  virtual void CreateDirectory(const FileSystemURL& path,
-                               bool exclusive,
-                               bool recursive,
-                               const StatusCallback& callback) = 0;
-
-  // Copies a file or directory from |src_path| to |dest_path|. If
-  // |src_path| is a directory, the contents of |src_path| are copied to
-  // |dest_path| recursively. A new file or directory is created at
-  // |dest_path| as needed.
-  // |option| specifies the minor behavior of Copy(). See CopyOrMoveOption's
-  // comment for details.
-  // |progress_callback| is periodically called to report the progress
-  // update. See also the comment of CopyProgressCallback. This callback is
-  // optional.
-  //
-  // For recursive case this internally creates new FileSystemOperations and
-  // calls:
-  // - ReadDirectory, CopyFileLocal and CreateDirectory
-  //   for same-filesystem case, or
-  // - ReadDirectory and CreateSnapshotFile on source filesystem and
-  //   CopyInForeignFile and CreateDirectory on dest filesystem
-  //   for cross-filesystem case.
-  //
-  virtual void Copy(const FileSystemURL& src_path,
-                    const FileSystemURL& dest_path,
-                    CopyOrMoveOption option,
-                    const CopyProgressCallback& progress_callback,
-                    const StatusCallback& callback) = 0;
-
-  // Moves a file or directory from |src_path| to |dest_path|. A new file
-  // or directory is created at |dest_path| as needed.
-  // |option| specifies the minor behavior of Copy(). See CopyOrMoveOption's
-  // comment for details.
-  //
-  // For recursive case this internally creates new FileSystemOperations and
-  // calls:
-  // - ReadDirectory, MoveFileLocal, CreateDirectory and Remove
-  //   for same-filesystem case, or
-  // - ReadDirectory, CreateSnapshotFile and Remove on source filesystem and
-  //   CopyInForeignFile and CreateDirectory on dest filesystem
-  //   for cross-filesystem case.
-  //
-  virtual void Move(const FileSystemURL& src_path,
-                    const FileSystemURL& dest_path,
-                    CopyOrMoveOption option,
-                    const StatusCallback& callback) = 0;
-
-  // Checks if a directory is present at |path|.
-  virtual void DirectoryExists(const FileSystemURL& path,
-                               const StatusCallback& callback) = 0;
-
-  // Checks if a file is present at |path|.
-  virtual void FileExists(const FileSystemURL& path,
-                          const StatusCallback& callback) = 0;
-
-  // Gets the metadata of a file or directory at |path|.
-  virtual void GetMetadata(const FileSystemURL& path,
-                           const GetMetadataCallback& callback) = 0;
-
-  // Reads contents of a directory at |path|.
-  virtual void ReadDirectory(const FileSystemURL& path,
-                             const ReadDirectoryCallback& callback) = 0;
-
-  // Removes a file or directory at |path|. If |recursive| is true, remove
-  // all files and directories under the directory at |path| recursively.
-  virtual void Remove(const FileSystemURL& path, bool recursive,
-                      const StatusCallback& callback) = 0;
-
-  // Writes the data read from |blob_request| using |writer_delegate|.
-  virtual void Write(
-    const FileSystemURL& url,
-    scoped_ptr<FileWriterDelegate> writer_delegate,
-    scoped_ptr<net::URLRequest> blob_request,
-    const WriteCallback& callback) = 0;
-
-  // Truncates a file at |path| to |length|. If |length| is larger than
-  // the original file size, the file will be extended, and the extended
-  // part is filled with null bytes.
-  virtual void Truncate(const FileSystemURL& path, int64 length,
-                        const StatusCallback& callback) = 0;
-
-  // Tries to cancel the current operation [we support cancelling write or
-  // truncate only]. Reports failure for the current operation, then reports
-  // success for the cancel operation itself via the |cancel_dispatcher|.
-  //
-  // E.g. a typical cancel implementation would look like:
-  //
-  //   virtual void SomeOperationImpl::Cancel(
-  //       const StatusCallback& cancel_callback) {
-  //     // Abort the current inflight operation first.
-  //     ...
-  //
-  //     // Dispatch ABORT error for the current operation by invoking
-  //     // the callback function for the ongoing operation,
-  //     operation_callback.Run(base::File::FILE_ERROR_ABORT, ...);
-  //
-  //     // Dispatch 'success' for the cancel (or dispatch appropriate
-  //     // error code with DidFail() if the cancel has somehow failed).
-  //     cancel_callback.Run(base::File::FILE_OK);
-  //   }
-  //
-  // Note that, for reporting failure, the callback function passed to a
-  // cancellable operations are kept around with the operation instance
-  // (as |operation_callback_| in the code example).
-  virtual void Cancel(const StatusCallback& cancel_callback) = 0;
-
-  // Modifies timestamps of a file or directory at |path| with
-  // |last_access_time| and |last_modified_time|. The function DOES NOT
-  // create a file unlike 'touch' command on Linux.
-  //
-  // This function is used only by Pepper as of writing.
-  virtual void TouchFile(const FileSystemURL& path,
-                         const base::Time& last_access_time,
-                         const base::Time& last_modified_time,
-                         const StatusCallback& callback) = 0;
-
-  // Opens a file at |path| with |file_flags|, where flags are OR'ed
-  // values of base::File::Flags.
-  //
-  // This function is used only by Pepper as of writing.
-  virtual void OpenFile(const FileSystemURL& path,
-                        int file_flags,
-                        const OpenFileCallback& callback) = 0;
-
-  // Creates a local snapshot file for a given |path| and returns the
-  // metadata and platform path of the snapshot file via |callback|.
-  // In local filesystem cases the implementation may simply return
-  // the metadata of the file itself (as well as GetMetadata does),
-  // while in remote filesystem case the backend may want to download the file
-  // into a temporary snapshot file and return the metadata of the
-  // temporary file.  Or if the implementaiton already has the local cache
-  // data for |path| it can simply return the path to the cache.
-  virtual void CreateSnapshotFile(const FileSystemURL& path,
-                                  const SnapshotFileCallback& callback) = 0;
-
-  // Copies in a single file from a different filesystem.
-  //
-  // This returns:
-  // - File::FILE_ERROR_NOT_FOUND if |src_file_path|
-  //   or the parent directory of |dest_url| does not exist.
-  // - File::FILE_ERROR_INVALID_OPERATION if |dest_url| exists and
-  //   is not a file.
-  // - File::FILE_ERROR_FAILED if |dest_url| does not exist and
-  //   its parent path is a file.
-  //
-  virtual void CopyInForeignFile(const base::FilePath& src_local_disk_path,
-                                 const FileSystemURL& dest_url,
-                                 const StatusCallback& callback) = 0;
-
-  // Removes a single file.
-  //
-  // This returns:
-  // - File::FILE_ERROR_NOT_FOUND if |url| does not exist.
-  // - File::FILE_ERROR_NOT_A_FILE if |url| is not a file.
-  //
-  virtual void RemoveFile(const FileSystemURL& url,
-                          const StatusCallback& callback) = 0;
-
-  // Removes a single empty directory.
-  //
-  // This returns:
-  // - File::FILE_ERROR_NOT_FOUND if |url| does not exist.
-  // - File::FILE_ERROR_NOT_A_DIRECTORY if |url| is not a directory.
-  // - File::FILE_ERROR_NOT_EMPTY if |url| is not empty.
-  //
-  virtual void RemoveDirectory(const FileSystemURL& url,
-                               const StatusCallback& callback) = 0;
-
-  // Copies a file from |src_url| to |dest_url|.
-  // This must be called for files that belong to the same filesystem
-  // (i.e. type() and origin() of the |src_url| and |dest_url| must match).
-  // |option| specifies the minor behavior of Copy(). See CopyOrMoveOption's
-  // comment for details.
-  // |progress_callback| is periodically called to report the progress
-  // update. See also the comment of CopyFileProgressCallback. This callback is
-  // optional.
-  //
-  // This returns:
-  // - File::FILE_ERROR_NOT_FOUND if |src_url|
-  //   or the parent directory of |dest_url| does not exist.
-  // - File::FILE_ERROR_NOT_A_FILE if |src_url| exists but is not a file.
-  // - File::FILE_ERROR_INVALID_OPERATION if |dest_url| exists and
-  //   is not a file.
-  // - File::FILE_ERROR_FAILED if |dest_url| does not exist and
-  //   its parent path is a file.
-  //
-  virtual void CopyFileLocal(const FileSystemURL& src_url,
-                             const FileSystemURL& dest_url,
-                             CopyOrMoveOption option,
-                             const CopyFileProgressCallback& progress_callback,
-                             const StatusCallback& callback) = 0;
-
-  // Moves a local file from |src_url| to |dest_url|.
-  // This must be called for files that belong to the same filesystem
-  // (i.e. type() and origin() of the |src_url| and |dest_url| must match).
-  // |option| specifies the minor behavior of Copy(). See CopyOrMoveOption's
-  // comment for details.
-  //
-  // This returns:
-  // - File::FILE_ERROR_NOT_FOUND if |src_url|
-  //   or the parent directory of |dest_url| does not exist.
-  // - File::FILE_ERROR_NOT_A_FILE if |src_url| exists but is not a file.
-  // - File::FILE_ERROR_INVALID_OPERATION if |dest_url| exists and
-  //   is not a file.
-  // - File::FILE_ERROR_FAILED if |dest_url| does not exist and
-  //   its parent path is a file.
-  //
-  virtual void MoveFileLocal(const FileSystemURL& src_url,
-                             const FileSystemURL& dest_url,
-                             CopyOrMoveOption option,
-                             const StatusCallback& callback) = 0;
-
-  // Synchronously gets the platform path for the given |url|.
-  // This may fail if the given |url|'s filesystem type is neither
-  // temporary nor persistent.
-  // In such a case, base::File::FILE_ERROR_INVALID_OPERATION will be
-  // returned.
-  virtual base::File::Error SyncGetPlatformPath(
-      const FileSystemURL& url,
-      base::FilePath* platform_path) = 0;
-
- protected:
-  // Used only for internal assertions.
-  enum OperationType {
-    kOperationNone,
-    kOperationCreateFile,
-    kOperationCreateDirectory,
-    kOperationCreateSnapshotFile,
-    kOperationCopy,
-    kOperationCopyInForeignFile,
-    kOperationMove,
-    kOperationDirectoryExists,
-    kOperationFileExists,
-    kOperationGetMetadata,
-    kOperationReadDirectory,
-    kOperationRemove,
-    kOperationWrite,
-    kOperationTruncate,
-    kOperationTouchFile,
-    kOperationOpenFile,
-    kOperationCloseFile,
-    kOperationGetLocalPath,
-    kOperationCancel,
-  };
-};
-
-}  // namespace fileapi
-
-#endif  // WEBKIT_BROWSER_FILEAPI_FILE_SYSTEM_OPERATION_H_