// Copyright 2023 The Ip2Region Authors. All rights reserved.
// Use of this source code is governed by a Apache2.0-style
// license that can be found in the LICENSE file.
// @Author Alan <lzh.shap@gmail.com>
// @Date   2023/07/25

using IP2Region.Net.Internal.Abstractions;

namespace IP2Region.Net.Internal;

internal class VectorIndexCacheStrategy(string xdbPath) : AbstractCacheStrategy(xdbPath)
{
    ReadOnlyMemory<byte> _vectorCahe = default;

    public override ReadOnlyMemory<byte> GetVectorIndexStartPos(int offset)
    {
        if (_vectorCahe.IsEmpty)
        {
            _vectorCahe = base.GetData(256, 256 * 256 * 8);
        }
        return _vectorCahe.Slice(offset, 8);
    }
}