GroupIteratorValue.cs

using Waher.Script.Abstraction.Elements;
using Waher.Script.Model;
 
namespace Waher.Script.Persistence.SQL.Groups
{
    public class GroupIteratorValue : ScriptNode
    {
        private readonly IIterativeEvaluator iterator;
        private readonly int iteratorIndex;
 
        public GroupIteratorValue(IIterativeEvaluator Iterator, int IteratorIndex,
            int Start, int Length, Expression Expression)
            : base(Start, Length, Expression)
        {
            this.iterator = Iterator;
            this.iteratorIndex = IteratorIndex;
        }
 
        public IIterativeEvaluator Iterator => this.iterator;
 
        public int IteratorIndex => this.iteratorIndex;
 
        public override bool ForAllChildNodes(ScriptNodeEventHandler Callback, object State, SearchMethod Order)
        {
            return true;
        }
 
        public override IElement Evaluate(Variables Variables)
        {
            if (Variables is ObjectProperties ObjectProperties &&
                ObjectProperties.Object is GroupObject GroupObject &&
                this.iteratorIndex<GroupObject.Aggregates.Length)
            {
                return GroupObject.Aggregates[this.iteratorIndex];
            }
            else
                return this.iterator.GetAggregatedResult();
        }
 
        public override string ToString()
        {
            return "Iterator(" + base.ToString() + ")";
        }
    }
}