/*

* This file is part of SharpMap.Demo.FormatConverter

* SharpMap.Demo.FormatConverter is free software © 2008 Newgrove Consultants Limited,

* http://www.newgrove.com; you can redistribute it and/or modify it under the terms

* of the current GNU Lesser General Public License (LGPL) as published by and

* available from the Free Software Foundation, Inc.,

* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA: http://fsf.org/

* This program is distributed without any warranty;

* without even the implied warranty of merchantability or fitness for purpose.

* See the GNU Lesser General Public License for the full details.

*

* Author: John Diss 2008

*

*/

using System;

using System.Data;

using GeoAPI.Geometries;

namespace SharpMap.Data

{

public class DataConverter<TSource, TTarget>

{

private readonly Func<TSource, TTarget> _conversionDelegate;

private readonly int _oidColumnIndex;

private readonly FeatureDataTable<TTarget> _target;

public DataConverter(IFeatureDataRecord source, int oidColumnIndex, IGeometryFactory geometryFactory)

: this(

delegate(TSource o) { return (TTarget) Convert.ChangeType(o, typeof (TTarget)); }, source, oidColumnIndex, geometryFactory)

{

}

public DataConverter(Func<TSource, TTarget> conversionDlgt, IFeatureDataRecord source, int oidColumnIndex, IGeometryFactory geometryFactory)

{

_conversionDelegate = conversionDlgt;

_oidColumnIndex = oidColumnIndex;

string oidColName = source.GetName(oidColumnIndex);

FeatureDataTable<TTarget> trgt = new FeatureDataTable<TTarget>("SchemaTable", oidColName,

geometryFactory);

for (int i = 0; i < source.FieldCount; i++)

if (i != oidColumnIndex)

trgt.Columns.Add(new DataColumn(source.GetName(i), source.GetFieldType(i)));

_target = trgt;

}

public FeatureDataTable<TTarget> Model

{

get { return _target; }

}

public FeatureDataRow<TTarget> ConvertRow(IFeatureDataRecord source)

{

if (typeof(TSource) == typeof(TTarget) && source is FeatureDataRow)

return source as FeatureDataRow<TTarget>;

TTarget oid = _conversionDelegate((TSource)source.GetOid());

FeatureDataRow<TTarget> row = _target.NewRow(oid);

object[] vals = new object[source.FieldCount];

vals[_oidColumnIndex] = oid;

source.GetValues(vals);

row.ItemArray = vals;

//row.Geometry = source.Geometry.IsValid ? source.Geometry : source.Geometry.Buffer(0.0);

row.Geometry = source.Geometry;

return row;

}

}

}