public ExprPreviousEvalStrategyCount(int streamNumber,
RandomAccessByIndexGetter randomAccessGetter,
RelativeAccessByEventNIndexMap relativeAccessGetter)
{
_streamNumber = streamNumber;
_randomAccessGetter = randomAccessGetter;
_relativeAccessGetter = relativeAccessGetter;
}
public ExprPreviousEvalStrategyWindow(int streamNumber, ExprEvaluator evalNode, Type componentType, RandomAccessByIndexGetter randomAccessGetter, RelativeAccessByEventNIndexMap relativeAccessGetter)
{
_streamNumber = streamNumber;
_evalNode = evalNode;
_componentType = componentType;
_randomAccessGetter = randomAccessGetter;
_relativeAccessGetter = relativeAccessGetter;
}
public static IStreamSortRankRandomAccess GetOptPreviousExprSortedRankedAccess(AgentInstanceViewFactoryChainContext agentInstanceViewFactoryContext)
{
IStreamSortRankRandomAccess rankedRandomAccess = null;
if (agentInstanceViewFactoryContext.PreviousNodeGetter != null)
{
RandomAccessByIndexGetter getter = (RandomAccessByIndexGetter)agentInstanceViewFactoryContext.PreviousNodeGetter;
rankedRandomAccess = new IStreamSortRankRandomAccess(getter);
getter.Updated(rankedRandomAccess);
}
return(rankedRandomAccess);
}
private static void HandlePrevious(IList <ExprPreviousNode> previousRequests, Object previousNodeGetter, IDictionary <ExprPreviousNode, ExprPreviousEvalStrategy> strategies)
{
if (previousRequests.IsEmpty())
{
return;
}
RandomAccessByIndexGetter randomAccessGetter = null;
RelativeAccessByEventNIndexMap relativeAccessGetter = null;
if (previousNodeGetter is RandomAccessByIndexGetter)
{
randomAccessGetter = (RandomAccessByIndexGetter)previousNodeGetter;
}
else if (previousNodeGetter is RelativeAccessByEventNIndexMap)
{
relativeAccessGetter = (RelativeAccessByEventNIndexMap)previousNodeGetter;
}
else
{
throw new EPException("Unexpected 'previous' handler: " + previousNodeGetter);
}
foreach (ExprPreviousNode previousNode in previousRequests)
{
int streamNumber = previousNode.StreamNumber;
ExprPreviousNodePreviousType previousType = previousNode.PreviousType;
ExprPreviousEvalStrategy evaluator;
if (previousType == ExprPreviousNodePreviousType.PREVWINDOW)
{
evaluator = new ExprPreviousEvalStrategyWindow(streamNumber, previousNode.ChildNodes[1].ExprEvaluator, previousNode.ReturnType.GetElementType(),
randomAccessGetter, relativeAccessGetter);
}
else if (previousType == ExprPreviousNodePreviousType.PREVCOUNT)
{
evaluator = new ExprPreviousEvalStrategyCount(streamNumber, randomAccessGetter, relativeAccessGetter);
}
else
{
evaluator = new ExprPreviousEvalStrategyPrev(streamNumber, previousNode.ChildNodes[0].ExprEvaluator, previousNode.ChildNodes[1].ExprEvaluator,
randomAccessGetter, relativeAccessGetter, previousNode.IsConstantIndex, previousNode.ConstantIndexNumber, previousType == ExprPreviousNodePreviousType.PREVTAIL);
}
strategies.Put(previousNode, evaluator);
}
}
public ExprPreviousEvalStrategyPrev(int streamNumber,
ExprEvaluator indexNode,
ExprEvaluator evalNode,
RandomAccessByIndexGetter randomAccessGetter,
RelativeAccessByEventNIndexMap relativeAccessGetter,
bool constantIndex,
int?constantIndexNumber,
bool tail)
{
_streamNumber = streamNumber;
_indexNode = indexNode;
_evalNode = evalNode;
_randomAccessGetter = randomAccessGetter;
_relativeAccessGetter = relativeAccessGetter;
_isConstantIndex = constantIndex;
_constantIndexNumber = constantIndexNumber;
_isTail = tail;
}
public ExprPreviousEvalStrategyPrev(
int streamNumber,
ExprEvaluator indexNode,
ExprEvaluator evalNode,
RandomAccessByIndexGetter randomAccessGetter,
RelativeAccessByEventNIndexGetter relativeAccessGetter,
bool constantIndex,
int? constantIndexNumber,
bool tail)
{
this.streamNumber = streamNumber;
this.indexNode = indexNode;
this.evalNode = evalNode;
this.randomAccessGetter = randomAccessGetter;
this.relativeAccessGetter = relativeAccessGetter;
isConstantIndex = constantIndex;
this.constantIndexNumber = constantIndexNumber;
isTail = tail;
}
