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using System;
using System.Collections.Generic;
using System.Data;
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 = null;
private List<TWorksheet> _cachedWorksheets = null;
~ExcelDataReader()
{
Dispose(false);
}
public string Name => _worksheetIterator?.Current?.Name;
public string CodeName => _worksheetIterator?.Current?.CodeName;
public string VisibleState => _worksheetIterator?.Current?.VisibleState;
public HeaderFooter HeaderFooter => _worksheetIterator?.Current?.HeaderFooter;
public CellRange[] MergeCells => _worksheetIterator?.Current?.MergeCells;
public int Depth { get; private set; }
public int ResultsCount => Workbook?.ResultsCount ?? -1;
public bool IsClosed { get; private set; }
public int FieldCount => _worksheetIterator?.Current?.FieldCount ?? 0;
public int RowCount => _worksheetIterator?.Current?.RowCount ?? 0;
public int RecordsAffected => throw new NotSupportedException();
public double RowHeight => _rowIterator?.Current.Height ?? 0;
protected TWorkbook Workbook { get; set; }
protected 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);
public Type GetFieldType(int i) => GetValue(i)?.GetType();
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;
}
public int GetValues(object[] values) => throw new NotSupportedException();
public bool IsDBNull(int i) => GetValue(i) == null;
public string GetNumberFormatString(int i)
{
if (RowCells == null)
throw new InvalidOperationException("No data exists for the row/column.");
if (RowCells[i] == null)
return null;
return _worksheetIterator?.Current?.GetNumberFormatString(RowCells[i].NumberFormatIndex)?.FormatString;
}
public int GetNumberFormatIndex(int i)
{
if (RowCells == null)
throw new InvalidOperationException("No data exists for the row/column.");
if (RowCells[i] == null)
return -1;
return RowCells[i].NumberFormatIndex;
}
public double GetColumnWidth(int i)
{
if (i >= FieldCount)
{
throw new ArgumentException($"Column at index {i} does not exist.", nameof(i));
}
var columnWidths = _worksheetIterator?.Current?.ColumnWidths ?? null;
double? retWidth = null;
if (columnWidths != null)
{
var colWidthIndex = 0;
while (colWidthIndex < columnWidths.Length && retWidth == null)
{
var columnWidth = columnWidths[colWidthIndex];
if (i >= columnWidth.Min && i <= columnWidth.Max)
{
retWidth = columnWidth.Hidden
? 0
: columnWidth.Width;
}
else
{
colWidthIndex++;
}
}
}
const double DefaultColumnWidth = 8.43D;
return retWidth ?? DefaultColumnWidth;
}
/// <inheritdoc />
public void Reset()
{
_worksheetIterator?.Dispose();
_rowIterator?.Dispose();
_worksheetIterator = null;
_rowIterator = null;
ResetSheetData();
if (Workbook != null)
{
_worksheetIterator = ReadWorksheetsWithCache().GetEnumerator(); // Workbook.ReadWorksheets().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();
_worksheetIterator = null;
_rowIterator = null;
RowCells = null;
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();
return true;
}
public bool Read()
{
if (_worksheetIterator == null || _rowIterator == null)
{
return false;
}
if (!_rowIterator.MoveNext())
{
_rowIterator.Dispose();
_rowIterator = null;
return false;
}
ReadCurrentRow();
Depth++;
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 = new List<TWorksheet>();
}
if (_cachedWorksheetIterator == null)
{
_cachedWorksheetIterator = Workbook.ReadWorksheets().GetEnumerator();
}
while (_cachedWorksheetIterator.MoveNext())
{
_cachedWorksheets.Add(_cachedWorksheetIterator.Current);
yield return _cachedWorksheetIterator.Current;
}
_cachedWorksheetIterator.Dispose();
_cachedWorksheetIterator = null;
}
private void ResetSheetData()
{
Depth = -1;
RowCells = null;
}
private void ReadCurrentRow()
{
if (RowCells == null)
{
RowCells = new Cell[FieldCount];
}
Array.Clear(RowCells, 0, RowCells.Length);
foreach (var cell in _rowIterator.Current.Cells)
{
if (cell.ColumnIndex < RowCells.Length)
{
RowCells[cell.ColumnIndex] = cell;
}
}
}
}
}