public CodegenExpression EvaluateGetROCollectionEventsCodegen(
CodegenMethodScope parent,
ExprForgeCodegenSymbol exprSymbol,
CodegenClassScope codegenClassScope)
{
if (PreviousType == ExprPreviousNodePreviousType.PREV ||
PreviousType == ExprPreviousNodePreviousType.PREVTAIL ||
PreviousType == ExprPreviousNodePreviousType.PREVCOUNT) {
return ConstantNull();
}
if (PreviousType != ExprPreviousNodePreviousType.PREVWINDOW) {
throw new IllegalStateException("Unrecognized previous type " + PreviousType);
}
var method = parent.MakeChild(typeof(FlexCollection), GetType(), codegenClassScope);
method.Block.DeclareVar<PreviousGetterStrategy>(
"strategy",
ExprDotMethod(
GetterField(codegenClassScope),
"GetStrategy",
exprSymbol.GetAddExprEvalCtx(method)));
method.Block.IfCondition(Not(exprSymbol.GetAddIsNewData(method))).BlockReturn(ConstantNull());
var randomAccess = method.Block.IfCondition(InstanceOf(Ref("strategy"), typeof(RandomAccessByIndexGetter)));
{
randomAccess
.DeclareVar<RandomAccessByIndexGetter>(
"getter",
Cast(typeof(RandomAccessByIndexGetter), Ref("strategy")))
.DeclareVar<RandomAccessByIndex>(
"randomAccess",
ExprDotName(Ref("getter"), "Accessor"))
.BlockReturn(FlexWrap(ExprDotName(Ref("randomAccess"), "WindowCollectionReadOnly")));
}
var relativeAccess = randomAccess.IfElse();
{
relativeAccess
.DeclareVar<RelativeAccessByEventNIndexGetter>(
"getter",
Cast(typeof(RelativeAccessByEventNIndexGetter), Ref("strategy")))
.DeclareVar<EventBean>(
"evalEvent",
ArrayAtIndex(exprSymbol.GetAddEPS(method), Constant(StreamNumber)))
.DeclareVar<RelativeAccessByEventNIndex>(
"relativeAccess",
ExprDotMethod(Ref("getter"), "GetAccessor", Ref("evalEvent")))
.IfRefNullReturnNull("relativeAccess")
.BlockReturn(FlexWrap(ExprDotName(Ref("relativeAccess"), "WindowToEventCollReadOnly")));
}
return LocalMethod(method);
}