private static IEnumerable <TSource> Equal <TSource>(IIndex <int, TSource> source,
BinaryExpression binaryExpression)
{
if (source is Index <int, TSource> )
{
Index <int, TSource> index = (Index <int, TSource>)source;
int max = index.Max();
ConstantExpression constantExpression = null;
if (binaryExpression.Right.NodeType == ExpressionType.Constant)
{
constantExpression = (ConstantExpression)binaryExpression.Right;
}
if (source.Contains((int)constantExpression.Value))
{
var item = source[(int)constantExpression.Value];
yield return(item);
}
}
else if (source is EqualIndex <int, TSource> )
{
EqualIndex <int, TSource> index = (EqualIndex <int, TSource>)source;
ConstantExpression constantExpression = null;
if (binaryExpression.Right.NodeType == ExpressionType.Constant)
{
constantExpression = (ConstantExpression)binaryExpression.Right;
}
if (source.Contains((int)constantExpression.Value))
{
var item = source[(int)constantExpression.Value];
yield return(item);
}
}
}
//public static IIndex<TKey, TSource> ToAvlIndex<TSource, TKey>(
// this IEnumerable<TSource> source, Func<TSource, TKey> keySelector) where TKey : IComparable<TKey>
//{
// Index<TKey, TSource> index = new Index<TKey, TSource>();
// foreach (var item in source)
// {
// TKey key = keySelector(item);
// index.Add(key, item);
// }
// return index;
//}
public static IIndex <TKey, TSource> ToEqualIndex <TSource, TKey>(
this IEnumerable <TSource> source, Func <TSource, TKey> keySelector) where TKey : IComparable <TKey>
{
EqualIndex <TKey, TSource> index = new EqualIndex <TKey, TSource>();
foreach (var item in source)
{
TKey key = keySelector(item);
index.Add(key, item);
}
return(index);
}