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// 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.
#ifndef WEBKIT_FILEAPI_RECURSIVE_OPERATION_DELEGATE_H_
#define WEBKIT_FILEAPI_RECURSIVE_OPERATION_DELEGATE_H_
#include <queue>
#include "base/basictypes.h"
#include "base/callback.h"
#include "base/memory/weak_ptr.h"
#include "webkit/fileapi/file_system_operation.h"
#include "webkit/fileapi/file_system_url.h"
namespace fileapi {
class FileSystemContext;
class LocalFileSystemOperation;
// A base class for recursive operation delegates.
// This also provides some convenient default implementations for subclasses
// like StartRecursiveOperation() and NewOperation().
//
// In short, each subclass should override ProcessFile and ProcessDirectory
// to process a directory or a file. To start the recursive operation it
// should also call StartRecursiveOperation.
//
// Each subclass can call NewOperation to create a new file system operation
// to perform a sub-operations, e.g. can call RemoveFile for recursive Remove.
class RecursiveOperationDelegate
: public base::SupportsWeakPtr<RecursiveOperationDelegate> {
public:
typedef FileSystemOperation::StatusCallback StatusCallback;
typedef FileSystemOperation::FileEntryList FileEntryList;
RecursiveOperationDelegate(LocalFileSystemOperation* original_operation);
virtual ~RecursiveOperationDelegate();
// This is called when the consumer of this instance starts a non-recursive
// operation.
virtual void Run() = 0;
// This is called when the consumer of this instance starts a recursive
// operation.
virtual void RunRecursively() = 0;
// This is called each time a file is found while recursively
// performing an operation.
virtual void ProcessFile(const FileSystemURL& url,
const StatusCallback& callback) = 0;
// This is called each time a directory is found while recursively
// performing an operation.
virtual void ProcessDirectory(const FileSystemURL& url,
const StatusCallback& callback) = 0;
protected:
// Starts to process files/directories recursively from the given |root|.
// This will call ProcessFile and ProcessDirectory on each directory or file.
// If the given |root| is a file this simply calls ProcessFile and exits.
//
// |callback| is fired with base::PLATFORM_FILE_OK when every file/directory
// under |root| is processed, or fired earlier when any suboperation fails.
void StartRecursiveOperation(const FileSystemURL& root,
const StatusCallback& callback);
// Returns new sub-operation for a given |url|.
// This may return NULL if any error has happened.
// If non-null |error| is given it is set to the error code.
LocalFileSystemOperation* NewOperation(const FileSystemURL& url,
base::PlatformFileError* error);
FileSystemContext* file_system_context();
private:
void ProcessNextDirectory();
void ProcessPendingFiles();
void DidProcessFile(base::PlatformFileError error);
void DidProcessDirectory(const FileSystemURL& url,
base::PlatformFileError error);
void DidReadDirectory(
const FileSystemURL& parent,
base::PlatformFileError error,
const FileEntryList& entries,
bool has_more);
void DidTryProcessFile(base::PlatformFileError previous_error,
base::PlatformFileError error);
LocalFileSystemOperation* original_operation_;
StatusCallback callback_;
std::queue<FileSystemURL> pending_directories_;
std::queue<FileSystemURL> pending_files_;
int inflight_operations_;
DISALLOW_COPY_AND_ASSIGN(RecursiveOperationDelegate);
};
} // namespace fileapi
#endif // WEBKIT_FILEAPI_RECURSIVE_OPERATION_DELEGATE_H_
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