public IEnumerable <T> Scan(QueryParameter <T> param)
{
if (!CheckParameter(param))
{
yield break;
}
var index = Dictionary;
switch (param.Comparer.Type)
{
case CompareTypes.Equal:
{
var key = CheckNull(param.TypedValue);
if (param.Comparer.Not)
{
foreach (var entry in index)
{
if (!entry.Key.Equals(key))
{
foreach (var item in entry.Value)
{
yield return(item);
}
}
}
}
else
{
if (index.TryGetValue(key, out var value) && value != null)
{
foreach (var item in value)
{
yield return(item);
}
}
}
}
break;
case CompareTypes.Greater:
{
var key = CheckNull(param.TypedValue);
foreach (var entry in index)
{
if (((IComparable)entry.Key).CompareTo(key) > 0)
{
foreach (var item in entry.Value)
{
yield return(item);
}
}
}
}
break;
case CompareTypes.GreaterOrEqual:
{
var key = CheckNull(param.TypedValue);
foreach (var entry in index)
{
if (((IComparable)entry.Key).CompareTo(key) >= 0)
{
foreach (var item in entry.Value)
{
yield return(item);
}
}
}
}
break;
case CompareTypes.Less:
{
var key = CheckNull(param.TypedValue);
foreach (var entry in index)
{
if (((IComparable)entry.Key).CompareTo(key) < 0)
{
foreach (var item in entry.Value)
{
yield return(item);
}
}
}
}
break;
case CompareTypes.LessOrEqual:
{
var key = CheckNull(param.TypedValue);
foreach (var entry in index)
{
if (((IComparable)entry.Key).CompareTo(param.TypedValue) <= 0)
{
foreach (var item in entry.Value)
{
yield return(item);
}
}
}
}
break;
case CompareTypes.Like:
{
var key = CheckNull(param.TypedValue);
var stringkey = key.ToString().Trim(new char[] { '%' });
foreach (var entry in index)
{
if (!entry.Key.Equals(entry) && (entry.Key.ToString()).IndexOf(stringkey, StringComparison.OrdinalIgnoreCase) != -1)
{
foreach (var item in entry.Value)
{
yield return(item);
}
}
}
}
break;
case CompareTypes.Is:
if (param.Comparer.Not)
{
foreach (var entry in index)
{
if (!entry.Key.Equals(NullKey))
{
foreach (var item in entry.Value)
{
yield return(item);
}
}
}
}
else
{
if (index.TryGetValue(NullKey, out var value))
{
foreach (var item in value)
{
yield return(item);
}
}
}
break;
case CompareTypes.In:
var list = param.Value as IEnumerable;
if (param.Comparer.Not)
{
foreach (var entry in index)
{
if (!ListHelper.Contains(list, entry.Key))
{
foreach (var item in entry.Value)
{
yield return(item);
}
}
}
}
else
{
foreach (var inItem in list)
{
if (index.TryGetValue(CheckNull(inItem), out var value))
{
foreach (T item in value)
{
yield return(item);
}
}
}
}
break;
}
}