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using System.Data;
using System.Diagnostics.CodeAnalysis;
#if NET8_0_OR_GREATER
#endif
using ExcelDataReader.Core;
namespace ExcelDataReader;
/// <summary>
/// A generic implementation of the IExcelDataReader interface using IWorkbook/IWorksheet to enumerate data.
/// </summary>
/// <typeparam name="TWorkbook">A type implementing IWorkbook.</typeparam>
/// <typeparam name="TWorksheet">A type implementing IWorksheet.</typeparam>
internal abstract class ExcelDataReader<TWorkbook, TWorksheet> : IExcelDataReader
where TWorkbook : IWorkbook<TWorksheet>
where TWorksheet : IWorksheet
{
private IEnumerator<TWorksheet>? _worksheetIterator;
private IEnumerator<Row>? _rowIterator;
private IEnumerator<TWorksheet>? _cachedWorksheetIterator;
private List<TWorksheet>? _cachedWorksheets;
private int _idx;
private bool _singlePassMode;
~ExcelDataReader()
{
Dispose(false);
}
public string? Name => _worksheetIterator?.Current?.Name;
public string? CodeName => _worksheetIterator?.Current?.CodeName;
public string? VisibleState => _worksheetIterator?.Current?.VisibleState;
public int ActiveSheet => GetWorkbook().ActiveSheet;
public bool IsActiveSheet => _idx == GetWorkbook().ActiveSheet;
public HeaderFooter? HeaderFooter => _worksheetIterator?.Current?.HeaderFooter;
// We shouldn't expose the internal array here.
public CellRange[] MergeCells => _worksheetIterator?.Current?.MergeCells ?? [];
public int Depth => 0;
public int ResultsCount => Workbook?.ResultsCount ?? -1;
public bool IsClosed { get; private set; }
public int FieldCount => _singlePassMode
? Math.Max(_worksheetIterator?.Current?.FieldCount ?? 0, RowCells?.Length ?? 0)
: (_worksheetIterator?.Current?.FieldCount ?? 0);
public int RowCount => _singlePassMode
? throw new InvalidOperationException("RowCount is not available in SinglePassMode.")
: (_worksheetIterator?.Current?.RowCount ?? 0);
public CellRange? Dimension => _worksheetIterator?.Current?.Dimension;
public int RecordsAffected => throw new NotSupportedException();
public double RowHeight => _rowIterator?.Current.Height ?? 0;
protected bool SinglePassMode { set => _singlePassMode = value; }
protected TWorkbook? Workbook { get; set; }
private Cell?[]? RowCells { get; set; }
public object this[int i] => GetValue(i);
public object this[string name] => throw new NotSupportedException();
public bool GetBoolean(int i) => (bool)GetValue(i);
public byte GetByte(int i) => (byte)GetValue(i);
public long GetBytes(int i, long fieldOffset, byte[]? buffer, int bufferoffset, int length)
=> throw new NotSupportedException();
public char GetChar(int i) => (char)GetValue(i);
public long GetChars(int i, long fieldoffset, char[]? buffer, int bufferoffset, int length)
=> throw new NotSupportedException();
public IDataReader GetData(int i) => throw new NotSupportedException();
public string GetDataTypeName(int i) => throw new NotSupportedException();
public DateTime GetDateTime(int i) => (DateTime)GetValue(i);
public decimal GetDecimal(int i) => (decimal)GetValue(i);
public double GetDouble(int i) => (double)GetValue(i);
#if NET8_0_OR_GREATER
[return: DynamicallyAccessedMembers(DynamicallyAccessedMemberTypes.PublicProperties | DynamicallyAccessedMemberTypes.PublicFields)]
#endif
public Type GetFieldType(int i) => GetValue(i)?.GetType() ?? typeof(DBNull);
public float GetFloat(int i) => (float)GetValue(i);
public Guid GetGuid(int i) => (Guid)GetValue(i);
public short GetInt16(int i) => (short)GetValue(i);
public int GetInt32(int i) => (int)GetValue(i);
public long GetInt64(int i) => (long)GetValue(i);
public string GetName(int i) => throw new NotSupportedException();
public int GetOrdinal(string name) => throw new NotSupportedException();
/// <inheritdoc />
public DataTable GetSchemaTable() => throw new NotSupportedException();
public string GetString(int i) => (string)GetValue(i);
public object GetValue(int i)
{
if (RowCells == null)
throw new InvalidOperationException("No data exists for the row/column.");
return RowCells[i]?.Value ?? DBNull.Value;
}
public int GetValues(object[] values)
{
if (RowCells == null)
throw new InvalidOperationException("No data exists for the row/column.");
int readingLenth = values.Length > FieldCount ? FieldCount : values.Length;
for (int i = 0; i < readingLenth; i++)
{
values[i] = RowCells[i]?.Value ?? DBNull.Value;
}
return readingLenth;
}
public bool IsDBNull(int i) => GetValue(i) is DBNull;
public string? GetNumberFormatString(int i)
{
if (RowCells == null)
throw new InvalidOperationException("No data exists for the row/column.");
if (RowCells[i]?.EffectiveStyle is not { } effectiveStyle)
return null;
return GetWorkbook().GetNumberFormatString(effectiveStyle.NumberFormatIndex, null)?.FormatString;
}
public string? GetNumberFormatString(int i, IFormatProvider? provider)
{
if (RowCells == null)
throw new InvalidOperationException("No data exists for the row/column.");
if (RowCells[i]?.EffectiveStyle is not { } effectiveStyle)
return null;
return GetWorkbook().GetNumberFormatString(effectiveStyle.NumberFormatIndex, provider)?.FormatString;
}
public int GetNumberFormatIndex(int i)
{
if (RowCells == null)
throw new InvalidOperationException("No data exists for the row/column.");
if (RowCells[i]?.EffectiveStyle is not { } effectiveStyle)
return -1;
return effectiveStyle.NumberFormatIndex;
}
public double GetColumnWidth(int i)
{
const double DefaultColumnWidth = 8.43D;
if (i >= FieldCount)
{
throw new ArgumentException($"Column at index {i} does not exist.", nameof(i));
}
var columnWidths = _worksheetIterator?.Current?.ColumnWidths;
if (columnWidths != null)
{
foreach (var columnWidth in columnWidths)
{
if (i >= columnWidth.Minimum && i <= columnWidth.Maximum)
{
return columnWidth.Hidden ? 0 : columnWidth.Width ?? DefaultColumnWidth;
}
}
}
return DefaultColumnWidth;
}
public CellStyle GetCellStyle(int i)
{
if (RowCells == null)
throw new InvalidOperationException("No data exists for the row/column.");
var result = new CellStyle();
if (RowCells[i]?.EffectiveStyle is not { } effectiveStyle)
{
return result;
}
result.FontIndex = effectiveStyle.FontIndex;
result.NumberFormatIndex = effectiveStyle.NumberFormatIndex;
result.IndentLevel = effectiveStyle.IndentLevel;
result.HorizontalAlignment = effectiveStyle.HorizontalAlignment;
result.VerticalAlignment = effectiveStyle.VerticalAlignment;
result.Hidden = effectiveStyle.Hidden;
result.Locked = effectiveStyle.Locked;
return result;
}
public CellError? GetCellError(int i)
{
if (RowCells == null)
throw new InvalidOperationException("No data exists for the row/column.");
return RowCells[i]?.Error;
}
/// <inheritdoc />
public void Reset()
{
_worksheetIterator?.Dispose();
_rowIterator?.Dispose();
_worksheetIterator = null;
_rowIterator = null;
_idx = 0;
ResetSheetData();
if (Workbook != null)
{
_worksheetIterator = ReadWorksheetsWithCache().GetEnumerator();
if (!_worksheetIterator.MoveNext())
{
_worksheetIterator.Dispose();
_worksheetIterator = null;
return;
}
_rowIterator = _worksheetIterator.Current.ReadRows().GetEnumerator();
}
}
public virtual void Close()
{
if (IsClosed)
return;
_worksheetIterator?.Dispose();
_rowIterator?.Dispose();
_cachedWorksheetIterator?.Dispose();
_worksheetIterator = null;
_rowIterator = null;
_cachedWorksheetIterator = null;
RowCells = null;
Workbook?.Dispose();
Workbook = default;
IsClosed = true;
}
public bool NextResult()
{
if (_worksheetIterator == null)
{
return false;
}
ResetSheetData();
_rowIterator?.Dispose();
_rowIterator = null;
if (!_worksheetIterator.MoveNext())
{
_worksheetIterator.Dispose();
_worksheetIterator = null;
return false;
}
_rowIterator = _worksheetIterator.Current.ReadRows().GetEnumerator();
_idx++;
return true;
}
public bool Read()
{
if (_worksheetIterator == null || _rowIterator == null)
{
return false;
}
if (!_rowIterator.MoveNext())
{
_rowIterator.Dispose();
_rowIterator = null;
return false;
}
ReadCurrentRow();
return true;
}
public void Dispose()
{
Dispose(true);
GC.SuppressFinalize(this);
}
private void Dispose(bool disposing)
{
if (disposing)
Close();
}
private IEnumerable<TWorksheet> ReadWorksheetsWithCache()
{
// Iterate TWorkbook.ReadWorksheets() only once and cache the
// worksheet instances, which are expensive to create.
if (_cachedWorksheets != null)
{
foreach (var worksheet in _cachedWorksheets)
{
yield return worksheet;
}
if (_cachedWorksheetIterator == null)
{
yield break;
}
}
else
{
_cachedWorksheets = [];
}
if (Workbook is null)
{
yield break;
}
_cachedWorksheetIterator ??= Workbook.ReadWorksheets().GetEnumerator();
while (_cachedWorksheetIterator.MoveNext())
{
_cachedWorksheets.Add(_cachedWorksheetIterator.Current);
yield return _cachedWorksheetIterator.Current;
}
_cachedWorksheetIterator.Dispose();
_cachedWorksheetIterator = null;
}
private void ResetSheetData()
{
RowCells = null;
}
private void ReadCurrentRow()
{
RowCells ??= new Cell?[FieldCount];
Array.Clear(RowCells, 0, RowCells.Length);
var rowIterator = _rowIterator;
if (rowIterator == null)
throw new InvalidOperationException("No data exists for the row/column.");
foreach (var cell in rowIterator.Current.Cells)
{
if (cell.ColumnIndex >= RowCells.Length)
{
if (_singlePassMode)
{
var resized = RowCells;
Array.Resize(ref resized, cell.ColumnIndex + 1);
RowCells = resized;
}
else
{
continue;
}
}
RowCells[cell.ColumnIndex] = cell;
}
}
private TWorkbook GetWorkbook()
{
return Workbook ?? throw new InvalidOperationException("Workbook is not initialized.");
}
}