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// LumenWorks.Framework.IO.CSV.CsvReader.RecordEnumerator
// Copyright (c) 2005 Sbastien Lorion
//
// MIT license (http://en.wikipedia.org/wiki/MIT_License)
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
// of the Software, and to permit persons to whom the Software is furnished to do so,
// subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in all
// copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
// INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
// PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE
// FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
// ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
using System;
using System.Collections;
using System.Collections.Generic;
using LumenWorks.Framework.IO.Csv.Resources;
namespace LumenWorks.Framework.IO.Csv
{
public partial class CsvReader
{
/// <summary>
/// Supports a simple iteration over the records of a <see cref="T:CsvReader"/>.
/// </summary>
public struct RecordEnumerator
: IEnumerator<string[]>, IEnumerator
{
#region Fields
/// <summary>
/// Contains the enumerated <see cref="T:CsvReader"/>.
/// </summary>
private CsvReader _reader;
/// <summary>
/// Contains the current record.
/// </summary>
private string[] _current;
/// <summary>
/// Contains the current record index.
/// </summary>
private long _currentRecordIndex;
#endregion
#region Constructors
/// <summary>
/// Initializes a new instance of the <see cref="T:RecordEnumerator"/> class.
/// </summary>
/// <param name="reader">The <see cref="T:CsvReader"/> to iterate over.</param>
/// <exception cref="T:ArgumentNullException">
/// <paramref name="reader"/> is a <see langword="null"/>.
/// </exception>
public RecordEnumerator(CsvReader reader)
{
if (reader == null)
throw new ArgumentNullException("reader");
_reader = reader;
_current = null;
_currentRecordIndex = reader._currentRecordIndex;
}
#endregion
#region IEnumerator<string[]> Members
/// <summary>
/// Gets the current record.
/// </summary>
public string[] Current
{
get { return _current; }
}
/// <summary>
/// Advances the enumerator to the next record of the CSV.
/// </summary>
/// <returns><see langword="true"/> if the enumerator was successfully advanced to the next record, <see langword="false"/> if the enumerator has passed the end of the CSV.</returns>
public bool MoveNext()
{
if (_reader._currentRecordIndex != _currentRecordIndex)
throw new InvalidOperationException(ExceptionMessage.EnumerationVersionCheckFailed);
if (_reader.ReadNextRecord())
{
_current = new string[_reader._fieldCount];
_reader.CopyCurrentRecordTo(_current);
_currentRecordIndex = _reader._currentRecordIndex;
return true;
}
else
{
_current = null;
_currentRecordIndex = _reader._currentRecordIndex;
return false;
}
}
#endregion
#region IEnumerator Members
/// <summary>
/// Sets the enumerator to its initial position, which is before the first record in the CSV.
/// </summary>
public void Reset()
{
if (_reader._currentRecordIndex != _currentRecordIndex)
throw new InvalidOperationException(ExceptionMessage.EnumerationVersionCheckFailed);
_reader.MoveTo(-1);
_current = null;
_currentRecordIndex = _reader._currentRecordIndex;
}
/// <summary>
/// Gets the current record.
/// </summary>
object IEnumerator.Current
{
get
{
if (_reader._currentRecordIndex != _currentRecordIndex)
throw new InvalidOperationException(ExceptionMessage.EnumerationVersionCheckFailed);
return this.Current;
}
}
#endregion
#region IDisposable Members
/// <summary>
/// Performs application-defined tasks associated with freeing, releasing, or resetting unmanaged resources.
/// </summary>
public void Dispose()
{
_reader = null;
_current = null;
}
#endregion
}
}
}
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