public virtual ExecuteAction Execute(IExecutorContext context)
{
this._currentIndex++;
if (this._currentIndex == this._node.OperandCount)
{
OPCTrendLib.Result[] argArray = new OPCTrendLib.Result[this._node.OperandCount];
for (int i = 0; i < this._node.OperandCount; i++)
{
argArray[i] = this._subVisitors[i].Result;
}
this.EndVisit(this._node.Expression.Eval((Evaluator)context, argArray));
return(ExecuteAction.End);
}
if (this._currentIndex > this._node.OperandCount)
{
throw new InvalidOperationException();
}
ExprNode node = (ExprNode)this._node.Operands[this._currentIndex];
this._subVisitors[this._currentIndex] = context.CreateExecutor(node);
context.Push(this._subVisitors[this._currentIndex]);
return(ExecuteAction.Continue);
}
protected void EndVisit(OPCTrendLib.Result result)
{
this._result = result;
this._subVisitors = null;
}