/// <summary>
/// Factory method to create the appropriate adapter based on a data source.
/// </summary>
/// <param name="dataSource">The data source to create an adapter for.</param>
/// <returns>Specific data source adapter instance.</returns>
/// <exception cref="ArgumentNullException">Thrown if the dataSource paramter is null.</exception>
/// <exception cref="NotSupportedException">Thrown if the dataSource is not of a supported type.</exception>"
internal static DataSourceAdapter <TItem> CreateAdapter(object dataSource)
{
if (dataSource == null)
{
throw new ArgumentException("dataSource cannot be null", "dataSource");
}
DataSourceAdapter <TItem> adapter;
Type dataSourceType = dataSource.GetType();
if (dataSourceType == typeof(DataTable))
{
adapter = new DataTableDataSourceAdapter <TItem>((DataTable)dataSource);
}
else if (typeof(IDataReader).IsAssignableFrom(dataSourceType))
{
adapter = new DataReaderDataSourceAdapter <TItem>((IDataReader)dataSource);
}
else if (typeof(IEnumerable).IsAssignableFrom(dataSourceType))
{
adapter = new EnumerableDataSourceAdapter <TItem>(dataSource);
}
else if (dataSourceType == typeof(ObjectDataSource))
{
adapter = new ObjectDataSourceDataSourceAdapter <TItem>((ObjectDataSource)dataSource);
}
else
{
throw new NotSupportedException(String.Format("{0} type not supported", dataSourceType.FullName));
}
return(adapter);
}
public void GetValue()
{
DataReaderDataSourceAdapter <IDataReader> adapter = new DataReaderDataSourceAdapter <IDataReader>(_reader);
IDataReader reader = GetReaderAtRow(adapter, 1);
object actual = adapter.GetValue(reader, new AdapterBoundField <IDataReader>("Name"));
Assert.AreEqual("Mickey Mouse", actual);
}
public void GetValueNull()
{
DataReaderDataSourceAdapter <IDataReader> adapter = new DataReaderDataSourceAdapter <IDataReader>(_reader);
IDataReader reader = GetReaderAtRow(adapter, 2);
object actual = adapter.GetValue(reader, new AdapterBoundField <IDataReader>("Name"));
Assert.IsNull(actual);
}
private IDataReader GetReaderAtRow(DataReaderDataSourceAdapter <IDataReader> adapter, int rowIndex)
{
IEnumerable enumerable = adapter.GetEnumerator();
Assert.IsNotNull(enumerable);
IEnumerator enumerator = enumerable.GetEnumerator();
Assert.IsNotNull(enumerator);
for (int i = 0; i < rowIndex; i++)
{
enumerator.MoveNext();
}
return(enumerator.Current as IDataReader);
}
public void GetEnumerator()
{
DataReaderDataSourceAdapter <IDataReader> adapter = new DataReaderDataSourceAdapter <IDataReader>(_reader);
IEnumerable enumerable = adapter.GetEnumerator();
Assert.IsNotNull(enumerable);
int i = 0;
foreach (IDataReader reader in enumerable)
{
object[] row = GetRow(reader);
CollectionAssert.AreEqual(_reader.Rows[i++], row);
}
Assert.AreEqual(4, i, "Should have read 4 rows.");
}
