// Copyright 2018 The Fuchsia Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#pragma once

#include <stdbool.h>
#include <stdint.h>

#include <blobfs/extent-reserver.h>
#include <blobfs/format.h>
#include <blobfs/iterator/extent-iterator.h>
#include <fbl/vector.h>
#include <zircon/types.h>

namespace blobfs {

// Allows traversing a collection of extents from a not-yet allocated node.
//
// This iterator is useful for accessing blocks of blobs which have not yet been
// committed to disk.
class VectorExtentIterator : public ExtentIterator {
public:
    VectorExtentIterator(const fbl::Vector<ReservedExtent>& extents);
    DISALLOW_COPY_AND_ASSIGN_ALLOW_MOVE(VectorExtentIterator);

    ////////////////
    // ExtentIterator interface.

    bool Done() const final;
    zx_status_t Next(const Extent** out) final;
    uint64_t BlockIndex() const final;

private:
    const fbl::Vector<ReservedExtent>& extents_;
    size_t extent_index_ = 0;
    uint64_t block_count_ = 0;
};

} // namespace blobfs