/// <summary>
/// Automatically select all <see cref="CandidateKey"/> columns and their data values for specified <see cref="DataRow"/>.
/// </summary>
/// <param name="key">The <see cref="CandidateKey"/>.</param>
/// <param name="dataRow">The specified <see cref="DataRow"/>.</param>
/// <returns>Number of columns selected.</returns>
public int AutoSelect(CandidateKey key, DataRow dataRow)
{
key.VerifyNotNull(nameof(key));
dataRow.VerifyNotNull(nameof(dataRow));
var valueKey = dataRow.Model.PrimaryKey;
if (valueKey != null && valueKey.GetType() == key.GetType())
{
for (int i = 0; i < valueKey.Count; i++)
{
_columnValues[key[i].Column] = valueKey[i].Column.GetValue(dataRow);
}
return(valueKey.Count);
}
var result = 0;
var valueColumns = dataRow.Model.Columns;
foreach (var columnSort in key)
{
var keyColumn = columnSort.Column;
var valueColumn = valueColumns.AutoSelect(keyColumn);
if (valueColumn != null)
{
_columnValues[keyColumn] = valueColumn.GetValue(dataRow);
result++;
}
}
return(result);
}
internal KeyMapping(CandidateKey sourceKey, CandidateKey targetKey)
{
sourceKey.VerifyNotNull(nameof(sourceKey));
targetKey.VerifyNotNull(nameof(targetKey));
if (targetKey.GetType() != sourceKey.GetType())
throw new ArgumentException(DiagnosticMessages.KeyMapping_SourceTargetTypeMismatch, nameof(targetKey));
Debug.Assert(sourceKey.Count == targetKey.Count);
_sourceKey = sourceKey;
_targetKey = targetKey;
}
/// <summary>
/// Join with target candidate key.
/// </summary>
/// <param name="target">The target candidate key.</param>
/// <returns>Column mappings between this candidate key and the target candidate key.</returns>
/// <remarks>You must ensure these two canidate key objects have identical columns, otherwise an exception will be thrown.</remarks>
public IReadOnlyList <ColumnMapping> UnsafeJoin(CandidateKey target)
{
target.VerifyNotNull(nameof(target));
if (Count != target.Count)
{
throw new ArgumentException(DiagnosticMessages.PrimaryKey_Join_ColumnsCountMismatch, nameof(target));
}
var result = new ColumnMapping[Count];
for (int i = 0; i < Count; i++)
{
var sourceColumn = this[i].Column;
var targetColumn = target[i].Column;
if (sourceColumn.DataType != targetColumn.DataType)
{
throw new ArgumentException(DiagnosticMessages.PrimaryKey_Join_ColumnDataTypeMismatch, string.Format("{0}[{1}]", nameof(target), i));
}
result[i] = new ColumnMapping(sourceColumn, targetColumn);
}
return(result);
}