private static ExprNode HandlePreviousFunctions(
ExprNode defineItemExpression,
IOrderedDictionary<int, IList<ExprPreviousMatchRecognizeNode>> previousNodes)
{
var previousVisitor = new ExprNodePreviousVisitorWParent();
defineItemExpression.Accept(previousVisitor);
if (previousVisitor.Previous == null) {
return defineItemExpression;
}
foreach (var previousNodePair in previousVisitor.Previous) {
var previousNode = previousNodePair.Second;
var matchRecogPrevNode = new ExprPreviousMatchRecognizeNode();
if (previousNodePair.Second.ChildNodes.Length == 1) {
matchRecogPrevNode.AddChildNode(previousNode.ChildNodes[0]);
matchRecogPrevNode.AddChildNode(new ExprConstantNodeImpl(1));
}
else if (previousNodePair.Second.ChildNodes.Length == 2) {
var first = previousNode.ChildNodes[0];
var second = previousNode.ChildNodes[1];
if (first is ExprConstantNode && !(second is ExprConstantNode)) {
matchRecogPrevNode.AddChildNode(second);
matchRecogPrevNode.AddChildNode(first);
}
else if (!(first is ExprConstantNode) && second is ExprConstantNode) {
matchRecogPrevNode.AddChildNode(first);
matchRecogPrevNode.AddChildNode(second);
}
else {
throw new ExprValidationException("PREV operator requires a constant index");
}
}
if (previousNodePair.First == null) {
defineItemExpression = matchRecogPrevNode;
}
else {
ExprNodeUtilityModify.ReplaceChildNode(
previousNodePair.First,
previousNodePair.Second,
matchRecogPrevNode);
}
// store in a list per index such that we can consolidate this into a single buffer
var index = matchRecogPrevNode.ConstantIndexNumber;
var callbackList = previousNodes.Get(index);
if (callbackList == null) {
callbackList = new List<ExprPreviousMatchRecognizeNode>();
previousNodes.Put(index, callbackList);
}
callbackList.Add(matchRecogPrevNode);
}
return defineItemExpression;
}
private ExprNode HandlePreviousFunctions(ExprNode defineItemExpression)
{
var previousVisitor = new ExprNodePreviousVisitorWParent();
defineItemExpression.Accept(previousVisitor);
if (previousVisitor.Previous == null)
{
return(defineItemExpression);
}
foreach (var previousNodePair in previousVisitor.Previous)
{
var previousNode = previousNodePair.Second;
var matchRecogPrevNode = new ExprPreviousMatchRecognizeNode();
if (previousNodePair.Second.ChildNodes.Count == 1)
{
matchRecogPrevNode.AddChildNode(previousNode.ChildNodes[0]);
matchRecogPrevNode.AddChildNode(new ExprConstantNodeImpl(1));
}
else if (previousNodePair.Second.ChildNodes.Count == 2)
{
var first = previousNode.ChildNodes[0];
var second = previousNode.ChildNodes[1];
if ((first.IsConstantResult) && (!second.IsConstantResult))
{
matchRecogPrevNode.AddChildNode(second);
matchRecogPrevNode.AddChildNode(first);
}
else if ((!first.IsConstantResult) && (second.IsConstantResult))
{
matchRecogPrevNode.AddChildNode(first);
matchRecogPrevNode.AddChildNode(second);
}
else
{
throw new ExprValidationException("PREV operator requires a constant index");
}
}
if (previousNodePair.First == null)
{
defineItemExpression = matchRecogPrevNode;
}
else
{
ExprNodeUtility.ReplaceChildNode(previousNodePair.First, previousNodePair.Second, matchRecogPrevNode);
}
// store in a list per index such that we can consolidate this into a single buffer
var index = matchRecogPrevNode.ConstantIndexNumber;
var callbackList = _callbacksPerIndex.Get(index);
if (callbackList == null)
{
callbackList = new List <ExprPreviousMatchRecognizeNode>();
_callbacksPerIndex.Put(index, callbackList);
}
callbackList.Add(matchRecogPrevNode);
}
return(defineItemExpression);
}