internal RecordState(RecordStateFactory recordStateFactory, CoordinatorFactory coordinatorFactory)
{
this.RecordStateFactory = recordStateFactory;
this.CoordinatorFactory = coordinatorFactory;
this.CurrentColumnValues = new object[RecordStateFactory.ColumnCount];
this.PendingColumnValues = new object[RecordStateFactory.ColumnCount];
}
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?");
}
internal RecordState(RecordStateFactory recordStateFactory, CoordinatorFactory coordinatorFactory)
{
RecordStateFactory = recordStateFactory;
CoordinatorFactory = coordinatorFactory;
CurrentColumnValues = new object[RecordStateFactory.ColumnCount];
PendingColumnValues = new object[RecordStateFactory.ColumnCount];
}
/// <summary>
/// Constructor used by the ResultColumn when doing GetValue, and by the Create factory
/// method.
/// </summary>
/// <param name="collection"></param>
/// <param name="isRoot"></param>
/// <param name="nextResultShaperInfos">enumrator of the shapers for NextResult() calls</param>
internal BridgeDataReader(Shaper<RecordState> shaper, CoordinatorFactory<RecordState> coordinatorFactory, int depth, IEnumerator<KeyValuePair<Shaper<RecordState>, CoordinatorFactory<RecordState>>> nextResultShaperInfos)
: base() {
Debug.Assert(null != shaper, "null shaper?");
Debug.Assert(null != coordinatorFactory, "null coordinatorFactory?");
Debug.Assert(depth == 0 || nextResultShaperInfos == null, "Nested data readers should not have multiple result sets.");
NextResultShaperInfoEnumerator = nextResultShaperInfos != null ? nextResultShaperInfos : null;
SetShaper(shaper, coordinatorFactory, depth);
}
protected CoordinatorFactory(
int depth, int stateSlot, Func<Shaper, bool> hasData, Func<Shaper, bool> setKeys, Func<Shaper, bool> checkKeys,
CoordinatorFactory[] nestedCoordinators, RecordStateFactory[] recordStateFactories)
{
Depth = depth;
StateSlot = stateSlot;
// figure out if there are any nested coordinators
IsLeafResult = 0 == nestedCoordinators.Length;
// if there is no explicit 'has data' discriminator, it means all rows contain data for the coordinator
if (hasData == null)
{
HasData = _alwaysTrue;
}
else
{
HasData = hasData;
}
// if there is no explicit set key delegate, just return true (the value is not used anyways)
if (setKeys == null)
{
SetKeys = _alwaysTrue;
}
else
{
SetKeys = setKeys;
}
// If there are no keys, it means different things depending on whether we are a leaf
// coordinator or an inner (or 'driving') coordinator. For a leaf coordinator, it means
// that every row is a new result. For an inner coordinator, it means that there is no
// key to check. This should only occur where there is a SingleRowTable (in other words,
// all rows are elements of a single child collection).
if (checkKeys == null)
{
if (IsLeafResult)
{
CheckKeys = _alwaysFalse; // every row is a new result (the keys don't match)
}
else
{
CheckKeys = _alwaysTrue; // every row belongs to a single child collection
}
}
else
{
CheckKeys = checkKeys;
}
NestedCoordinators = new ReadOnlyCollection<CoordinatorFactory>(nestedCoordinators);
RecordStateFactories = new ReadOnlyCollection<RecordStateFactory>(recordStateFactories);
// Determines whether this coordinator can be handled by a 'simple' enumerator. See IsSimple for details.
IsSimple = IsLeafResult && null == checkKeys && null == hasData;
}
internal BridgeDataReader(
Shaper<RecordState> shaper, CoordinatorFactory<RecordState> coordinatorFactory, int depth,
IEnumerator<KeyValuePair<Shaper<RecordState>, CoordinatorFactory<RecordState>>> nextResultShaperInfos)
{
//Contract.Requires(null != shaper);
//Contract.Requires(null != coordinatorFactory);
//Contract.Requires(depth == 0 || nextResultShaperInfos == null, "Nested data readers should not have multiple result sets.");
_nextResultShaperInfoEnumerator = nextResultShaperInfos;
SetShaper(shaper, coordinatorFactory, depth);
}
internal CoordinatorFactory Compile()
{
RecordStateFactory[] recordStateFactories;
if (null != _recordStateScratchpads)
{
recordStateFactories = new RecordStateFactory[_recordStateScratchpads.Count];
for (int i = 0; i < recordStateFactories.Length; i++)
{
recordStateFactories[i] = _recordStateScratchpads[i].Compile();
}
}
else
{
recordStateFactories = new RecordStateFactory[0];
}
CoordinatorFactory[] nestedCoordinators = new CoordinatorFactory[_nestedCoordinatorScratchpads.Count];
for (int i = 0; i < nestedCoordinators.Length; i++)
{
nestedCoordinators[i] = _nestedCoordinatorScratchpads[i].Compile();
}
// compile inline delegates
ReplacementExpressionVisitor replacementVisitor = new ReplacementExpressionVisitor(null, this._inlineDelegates);
Expression element = new SecurityBoundaryExpressionVisitor().Visit(replacementVisitor.Visit(this.Element));
// substitute expressions that have error handlers into a new expression (used
// when a more detailed exception message is needed)
replacementVisitor = new ReplacementExpressionVisitor(this._expressionWithErrorHandlingMap, this._inlineDelegates);
Expression elementWithErrorHandling = new SecurityBoundaryExpressionVisitor().Visit(replacementVisitor.Visit(this.Element));
CoordinatorFactory result = (CoordinatorFactory)Activator.CreateInstance(typeof(CoordinatorFactory <>).MakeGenericType(_elementType), new object[] {
this.Depth,
this.StateSlotNumber,
this.HasData,
this.SetKeys,
this.CheckKeys,
nestedCoordinators,
element,
elementWithErrorHandling,
this.InitializeCollection,
recordStateFactories
});
return(result);
}
protected Coordinator(CoordinatorFactory coordinatorFactory, Coordinator parent, Coordinator next)
{
this.CoordinatorFactory = coordinatorFactory;
this.Parent = parent;
this.Next = next;
}
protected Coordinator(CoordinatorFactory coordinatorFactory, Coordinator parent, Coordinator next)
{
this.CoordinatorFactory = coordinatorFactory;
this.Parent = parent;
this.Next = next;
}
/// <summary>
/// It's GO time, create the record state.
/// </summary>
internal RecordState Create(CoordinatorFactory coordinatorFactory)
{
return new RecordState(this, coordinatorFactory);
}
/// <summary>
/// It's GO time, create the record state.
/// </summary>
internal RecordState Create(CoordinatorFactory coordinatorFactory)
{
return(new RecordState(this, coordinatorFactory));
}
internal CoordinatorFactory Compile()
{
RecordStateFactory[] recordStateFactories;
if (null != _recordStateScratchpads)
{
recordStateFactories = new RecordStateFactory[_recordStateScratchpads.Count];
for (var i = 0; i < recordStateFactories.Length; i++)
{
recordStateFactories[i] = _recordStateScratchpads[i].Compile();
}
}
else
{
recordStateFactories = new RecordStateFactory[0];
}
var nestedCoordinators = new CoordinatorFactory[_nestedCoordinatorScratchpads.Count];
for (var i = 0; i < nestedCoordinators.Length; i++)
{
nestedCoordinators[i] = _nestedCoordinatorScratchpads[i].Compile();
}
// compile inline delegates
var replacementVisitor = new ReplacementExpressionVisitor(null, _inlineDelegates);
var element = new SecurityBoundaryExpressionVisitor().Visit(replacementVisitor.Visit(Element));
// substitute expressions that have error handlers into a new expression (used
// when a more detailed exception message is needed)
replacementVisitor = new ReplacementExpressionVisitor(_expressionWithErrorHandlingMap, _inlineDelegates);
var elementWithErrorHandling = new SecurityBoundaryExpressionVisitor().Visit(replacementVisitor.Visit(Element));
var result =
(CoordinatorFactory)Activator.CreateInstance(
typeof(CoordinatorFactory<>).MakeGenericType(_elementType), new object[]
{
Depth,
StateSlotNumber,
HasData,
SetKeys,
CheckKeys,
nestedCoordinators,
element,
elementWithErrorHandling,
InitializeCollection,
recordStateFactories
});
return result;
}