/*
* Checks whether the datatable schema matches with the surrogate schema.
*/
private bool IsSchemaIdentical(DataTable dt)
{
Debug.Assert(dt != null);
if (dt.TableName != _tableName || dt.Namespace != _namespace)
{
return(false);
}
Debug.Assert(_dataColumnSurrogates != null);
if (dt.Columns.Count != _dataColumnSurrogates.Length)
{
return(false);
}
for (int i = 0; i < dt.Columns.Count; i++)
{
DataColumn dc = dt.Columns[i];
DataColumnSurrogate dataColumnSurrogate = _dataColumnSurrogates[i];
if (!dataColumnSurrogate.IsSchemaIdentical(dc))
{
return(false);
}
}
return(true);
}
/*
* Sets expression on the columns.
*/
internal void SetColumnExpressions(DataTable dt)
{
Debug.Assert(dt != null);
Debug.Assert(_dataColumnSurrogates != null);
Debug.Assert(dt.Columns.Count == _dataColumnSurrogates.Length);
for (int i = 0; i < dt.Columns.Count; i++)
{
DataColumn dc = dt.Columns[i];
DataColumnSurrogate dataColumnSurrogate = _dataColumnSurrogates[i];
dataColumnSurrogate.SetColumnExpression(dc);
}
}
//Keep a map between the row index and the Arraylist of columns that are in error and the error strings.
/*
* Constructs a DataTableSurrogate from a DataTable.
*/
public DataTableSurrogate(DataTable dt)
{
if (dt == null)
{
throw new ArgumentNullException("The parameter dt is null");
}
_tableName = dt.TableName;
_namespace = dt.Namespace;
_prefix = dt.Prefix;
_caseSensitive = dt.CaseSensitive;
_locale = dt.Locale;
_displayExpression = dt.DisplayExpression;
_minimumCapacity = dt.MinimumCapacity;
//Columns
_dataColumnSurrogates = new DataColumnSurrogate[dt.Columns.Count];
for (int i = 0; i < dt.Columns.Count; i++)
{
_dataColumnSurrogates[i] = new DataColumnSurrogate(dt.Columns[i]);
}
//Constraints
_uniqueConstraints = GetUniqueConstraints(dt);
//ExtendedProperties
_extendedProperties = new Hashtable();
if (dt.ExtendedProperties.Keys.Count > 0)
{
foreach (object propertyKey in dt.ExtendedProperties.Keys)
{
_extendedProperties.Add(propertyKey, dt.ExtendedProperties[propertyKey]);
}
}
//Rows
if (dt.Rows.Count > 0)
{
_rowStates = new BitArray(dt.Rows.Count << 1);
_records = new object[dt.Columns.Count][];
for (int i = 0; i < dt.Columns.Count; i++)
{
_records[i] = new object[dt.Rows.Count << 1];
}
for (int i = 0; i < dt.Rows.Count; i++)
{
GetRecords(dt.Rows[i], i << 1);
}
}
}
/*
* Reads the schema into the datatable from DataTableSurrogate.
*/
public void ReadSchemaIntoDataTable(DataTable dt)
{
if (dt == null)
{
throw new ArgumentNullException("The datatable parameter cannot be null");
}
dt.TableName = _tableName;
dt.Namespace = _namespace;
dt.Prefix = _prefix;
dt.CaseSensitive = _caseSensitive;
dt.Locale = _locale;
dt.DisplayExpression = _displayExpression;
dt.MinimumCapacity = _minimumCapacity;
Debug.Assert(_dataColumnSurrogates != null);
for (int i = 0; i < _dataColumnSurrogates.Length; i++)
{
DataColumnSurrogate dataColumnSurrogate = _dataColumnSurrogates[i];
DataColumn dc = dataColumnSurrogate.ConvertToDataColumn();
dt.Columns.Add(dc);
}
//UniqueConstraints
SetUniqueConstraints(dt, _uniqueConstraints);
//Extended properties
Debug.Assert(_extendedProperties != null);
if (_extendedProperties.Keys.Count > 0)
{
foreach (object propertyKey in _extendedProperties.Keys)
{
dt.ExtendedProperties.Add(propertyKey, _extendedProperties[propertyKey]);
}
}
}
