/// <summary>
/// Creates block and reads its contents from index file
/// </summary>
/// <param name="offset">Offset of block in index file</param>
/// <param name="length">Length of block in index file</param>
/// <returns>New block instance</returns>
/// <exception cref="IOException">not enough data in index file to fill the block</exception>
public static T Read <T>(this IIndexFileBlockProvider blockProvider, long offset, int length) where T : ISerializableIndexData, new()
{
var result = new T();
blockProvider.Read(result, offset, length);
return(result);
}
/// <summary>
/// Initializes new instance of <see cref="StorageFileReader"/> class.
/// </summary>
/// <param name="streamFactory"><see cref="IStreamFactory"/> object used to create file streams</param>
/// <exception cref="ArgumentNullException">factory is null</exception>
public BinaryStorageIndex(IIndexFileBlockProvider blockProvider)
{
this.blockProvider = blockProvider.ThrowIfNull(nameof(blockProvider));
if (blockProvider.Length == 0)
{
header = new IndexHeader();
blockProvider.Write(header, 0);
}
else
{
header = blockProvider.Read <IndexHeader>(0, IndexHeader.FullHeaderSize);
}
}
/// <summary>
/// Creates <see cref="IBinaryStorageIndex"/> instance, responsible for providing record metadata by keys.
/// </summary>
/// <param name="blockProvider">The <see cref="IIndexFileBlockProvider"/> instance, used by <see cref="IBinaryStorageIndex"/> to access the index file</param>
/// <returns>New <see cref="IBinaryStorageIndex"/> instance</returns>
public IBinaryStorageIndex CreateBinaryStorageIndex(IIndexFileBlockProvider blockProvider)
{
return(new BinaryStorageIndex(blockProvider));
}