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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 NET_BASE_ELEMENTS_UPLOAD_DATA_STREAM_H_
#define NET_BASE_ELEMENTS_UPLOAD_DATA_STREAM_H_
#include "base/basictypes.h"
#include "base/macros.h"
#include "base/memory/ref_counted.h"
#include "base/memory/scoped_ptr.h"
#include "base/memory/scoped_vector.h"
#include "base/memory/weak_ptr.h"
#include "net/base/net_export.h"
#include "net/base/upload_data_stream.h"
namespace net {
class DrainableIOBuffer;
class IOBuffer;
class UploadElementReader;
// A non-chunked UploadDataStream consisting of one or more UploadElements.
class NET_EXPORT ElementsUploadDataStream : public UploadDataStream {
public:
ElementsUploadDataStream(ScopedVector<UploadElementReader> element_readers,
int64 identifier);
~ElementsUploadDataStream() override;
// Creates an ElementsUploadDataStream with a single reader. Returns a
// scoped_ptr<UploadDataStream> for ease of use.
static scoped_ptr<UploadDataStream> CreateWithReader(
scoped_ptr<UploadElementReader> reader,
int64 identifier);
private:
// UploadDataStream implementation.
bool IsInMemory() const override;
const ScopedVector<UploadElementReader>* GetElementReaders() const override;
int InitInternal() override;
int ReadInternal(IOBuffer* buf, int buf_len) override;
void ResetInternal() override;
// Runs Init() for all element readers.
// This method is used to implement InitInternal().
int InitElements(size_t start_index);
// Called when the |index| element finishes initialization. If it succeeded,
// continues with the |index + 1| element. Calls OnInitCompleted on error or
// when all elements have been initialized.
void OnInitElementCompleted(size_t index, int result);
// Reads data from the element readers.
// This method is used to implement Read().
int ReadElements(const scoped_refptr<DrainableIOBuffer>& buf);
// Resumes pending read and calls OnReadCompleted with a result when
// necessary.
void OnReadElementCompleted(const scoped_refptr<DrainableIOBuffer>& buf,
int result);
// Processes result of UploadElementReader::Read(). If |result| indicates
// success, updates |buf|'s offset. Otherwise, sets |read_failed_| to true.
void ProcessReadResult(const scoped_refptr<DrainableIOBuffer>& buf,
int result);
ScopedVector<UploadElementReader> element_readers_;
// Index of the current upload element (i.e. the element currently being
// read). The index is used as a cursor to iterate over elements in
// |upload_data_|.
size_t element_index_;
// True if an error occcured during read operation.
bool read_failed_;
base::WeakPtrFactory<ElementsUploadDataStream> weak_ptr_factory_;
DISALLOW_COPY_AND_ASSIGN(ElementsUploadDataStream);
};
} // namespace net
#endif // NET_BASE_ELEMENTS_UPLOAD_DATA_STREAM_H_
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