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// Copyright (c) 2015 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 STORAGE_BROWSER_BLOB_BLOB_DATA_ITEM_H_
#define STORAGE_BROWSER_BLOB_BLOB_DATA_ITEM_H_
#include "base/basictypes.h"
#include "base/memory/ref_counted.h"
#include "storage/browser/blob/shareable_file_reference.h"
#include "storage/browser/storage_browser_export.h"
#include "storage/common/data_element.h"
namespace storage {
class BlobDataBuilder;
class BlobStorageContext;
// Ref counted blob item. This class owns the backing data of the blob item.
// The backing data is immutable, and cannot change after creation.
// The purpose of this class is to allow the resource to stick around in the
// snapshot even after the resource was swapped in the blob (either to disk or
// to memory) by the BlobStorageContext.
class STORAGE_EXPORT BlobDataItem : public base::RefCounted<BlobDataItem> {
public:
DataElement::Type type() const { return item_->type(); }
const char* bytes() const { return item_->bytes(); }
const base::FilePath& path() const { return item_->path(); }
const GURL& filesystem_url() const { return item_->filesystem_url(); }
const std::string& blob_uuid() const { return item_->blob_uuid(); }
uint64 offset() const { return item_->offset(); }
uint64 length() const { return item_->length(); }
const base::Time& expected_modification_time() const {
return item_->expected_modification_time();
}
const DataElement& data_element() const { return *item_; }
const DataElement* data_element_ptr() const { return item_.get(); }
private:
friend class BlobDataBuilder;
friend class BlobStorageContext;
friend class base::RefCounted<BlobDataItem>;
BlobDataItem(scoped_ptr<DataElement> item);
BlobDataItem(scoped_ptr<DataElement> item,
scoped_refptr<ShareableFileReference> file_handle);
virtual ~BlobDataItem();
scoped_ptr<DataElement> item_;
scoped_refptr<ShareableFileReference> file_handle_;
};
#if defined(UNIT_TEST)
inline bool operator==(const BlobDataItem& a, const BlobDataItem& b) {
return a.data_element() == b.data_element();
}
inline bool operator!=(const BlobDataItem& a, const BlobDataItem& b) {
return !(a == b);
}
#endif // defined(UNIT_TEST)
} // namespace storage
#endif // STORAGE_BROWSER_BLOB_BLOB_DATA_ITEM_H_
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