ReadLinesIterator.cs

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using System.Text;
 
namespace System.IO;
 
internal sealed class ReadLinesIterator : Iterator<string>
{
    private readonly string _path;
 
    private readonly Encoding _encoding;
 
    private StreamReader _reader;
 
    private ReadLinesIterator(string path, Encoding encoding, StreamReader reader)
    {
        _path = path;
        _encoding = encoding;
        _reader = reader;
    }
 
    public override bool MoveNext()
    {
        if (_reader != null)
        {
            current = _reader.ReadLine();
            if (current != null)
            {
                return true;
            }
            Dispose();
        }
        return false;
    }
 
    protected override Iterator<string> Clone()
    {
        return CreateIterator(_path, _encoding, _reader);
    }
 
    protected override void Dispose(bool disposing)
    {
        try
        {
            if (disposing && _reader != null)
            {
                _reader.Dispose();
            }
        }
        finally
        {
            _reader = null;
            base.Dispose(disposing);
        }
    }
 
    internal static ReadLinesIterator CreateIterator(string path, Encoding encoding)
    {
        return CreateIterator(path, encoding, null);
    }
 
    private static ReadLinesIterator CreateIterator(string path, Encoding encoding, StreamReader reader)
    {
        return new ReadLinesIterator(path, encoding, reader ?? new StreamReader(path, encoding));
    }
}