private void SetShaper(Shaper<RecordState> shaper, CoordinatorFactory<RecordState> coordinatorFactory, int depth)
{
_shaper = shaper;
_coordinatorFactory = coordinatorFactory;
_dataRecord = new BridgeDataRecord(shaper, depth);
// To determine whether there are any rows for this coordinator at this place in
// the root enumerator, we pretty much just look at it's current record (we'll read
// one if there isn't one waiting) and if it matches our coordinator, we've got rows.
_hasRows = false;
if (!_shaper.DataWaiting)
{
_shaper.DataWaiting = _shaper.RootEnumerator.MoveNext();
}
if (_shaper.DataWaiting)
{
var currentRecord = _shaper.RootEnumerator.Current;
if (null != currentRecord)
{
_hasRows = (currentRecord.CoordinatorFactory == _coordinatorFactory);
}
}
// Once we've created the root enumerator, we can get the default record state
_defaultRecordState = coordinatorFactory.GetDefaultRecordState(_shaper);
Debug.Assert(null != _defaultRecordState, "no default?");
}
private void SetShaper(Shaper <RecordState> shaper, CoordinatorFactory <RecordState> coordinatorFactory, int depth)
{
Shaper = shaper;
CoordinatorFactory = coordinatorFactory;
DataRecord = new BridgeDataRecord(shaper, depth);
// To determine whether there are any rows for this coordinator at this place in
// the root enumerator, we pretty much just look at it's current record (we'll read
// one if there isn't one waiting) and if it matches our coordinator, we've got rows.
_hasRows = false;
if (!Shaper.DataWaiting)
{
Shaper.DataWaiting = Shaper.RootEnumerator.MoveNext();
}
if (Shaper.DataWaiting)
{
RecordState currentRecord = Shaper.RootEnumerator.Current;
if (null != currentRecord)
{
_hasRows = (currentRecord.CoordinatorFactory == CoordinatorFactory);
}
}
// Once we've created the root enumerator, we can get the default record state
DefaultRecordState = coordinatorFactory.GetDefaultRecordState(Shaper);
Debug.Assert(null != DefaultRecordState, "no default?");
}
/// <summary>
/// Ensure that whatever column we're currently processing is implicitly closed;
/// </summary>
private void CloseNestedObjectImplicitly()
{
// it would be nice to use Interlocked.Exchange to avoid multi-thread `race condition risk
// when the the bridge is being misused by the user accessing it with multiple threads.
// but this is called frequently enough to have a performance impact
BridgeDataRecord currentNestedRecord = _currentNestedRecord;
if (null != currentNestedRecord)
{
_currentNestedRecord = null;
currentNestedRecord.CloseImplicitly();
}
BridgeDataReader currentNestedReader = _currentNestedReader;
if (null != currentNestedReader)
{
_currentNestedReader = null;
currentNestedReader.CloseImplicitly();
}
}
/// <summary>
/// For nested objects (records/readers) we have a bit more work to do; this
/// method extracts it all out from the main GetValue method so it doesn't
/// have to be so big.
/// </summary>
/// <param name="result"></param>
/// <returns></returns>
private object GetNestedObjectValue(object result)
{
if (result != DBNull.Value)
{
RecordState recordState = result as RecordState;
if (null != recordState)
{
if (recordState.IsNull)
{
result = DBNull.Value;
}
else
{
BridgeDataRecord nestedRecord = new BridgeDataRecord(Shaper, Depth + 1);
nestedRecord.SetRecordSource(recordState, true);
result = nestedRecord;
_currentNestedRecord = nestedRecord;
_currentNestedReader = null;
}
}
else
{
Coordinator <RecordState> coordinator = result as Coordinator <RecordState>;
if (null != coordinator)
{
BridgeDataReader nestedReader = new BridgeDataReader(Shaper, coordinator.TypedCoordinatorFactory, Depth + 1, nextResultShaperInfos: null);
result = nestedReader;
_currentNestedRecord = null;
_currentNestedReader = nestedReader;
}
else
{
Debug.Fail("unexpected type of nested object result: " + result.GetType().ToString());
}
}
}
return(result);
}
/// <summary>
/// For nested objects (records/readers) we have a bit more work to do; this
/// method extracts it all out from the main GetValue method so it doesn't
/// have to be so big.
/// </summary>
/// <param name="result"></param>
/// <returns></returns>
private object GetNestedObjectValue(object result) {
if (result != DBNull.Value) {
RecordState recordState = result as RecordState;
if (null != recordState) {
if (recordState.IsNull) {
result = DBNull.Value;
}
else {
BridgeDataRecord nestedRecord = new BridgeDataRecord(Shaper, Depth + 1);
nestedRecord.SetRecordSource(recordState, true);
result = nestedRecord;
_currentNestedRecord = nestedRecord;
_currentNestedReader = null;
}
}
else {
Coordinator<RecordState> coordinator = result as Coordinator<RecordState>;
if (null != coordinator) {
BridgeDataReader nestedReader = new BridgeDataReader(Shaper, coordinator.TypedCoordinatorFactory, Depth + 1, nextResultShaperInfos: null);
result = nestedReader;
_currentNestedRecord = null;
_currentNestedReader = nestedReader;
}
else {
Debug.Fail("unexpected type of nested object result: " + result.GetType().ToString());
}
}
}
return result;
}
/// <summary>
/// Ensure that whatever column we're currently processing is implicitly closed;
/// </summary>
private void CloseNestedObjectImplicitly() {
// it would be nice to use Interlocked.Exchange to avoid multi-thread `race condition risk
// when the the bridge is being misused by the user accessing it with multiple threads.
// but this is called frequently enough to have a performance impact
BridgeDataRecord currentNestedRecord = _currentNestedRecord;
if (null != currentNestedRecord) {
_currentNestedRecord = null;
currentNestedRecord.CloseImplicitly();
}
BridgeDataReader currentNestedReader = _currentNestedReader;
if (null != currentNestedReader) {
_currentNestedReader = null;
currentNestedReader.CloseImplicitly();
}
}
