private static bool WhereQuery(WhereClause where, IDictionary<string, object> e)
{
var result = false;
var obj = e[where.Property];
var value = ParseType(obj);
if (where.Type == typeof(int))
{
var n = (int)where.Value;
var number = value.Type == typeof(int) ? (int)value.Value : Convert.ToInt32(value.Value);
switch (where.Operator)
{
case WhereOperator.Equals:
result = (number == n);
break;
case WhereOperator.GreaterThan:
result = (number > n);
break;
case WhereOperator.LessThan:
result = (number < n);
break;
case WhereOperator.Contains:
case WhereOperator.EndsWith:
case WhereOperator.StartsWith:
throw new InvalidOperationException();
}
}
else
{
var s = (string)where.Value;
var str = Convert.ToString(value.Value);
switch (where.Operator)
{
case WhereOperator.Contains:
result = -1 != str.IndexOf(s);
break;
case WhereOperator.Equals:
result = (str == s);
break;
case WhereOperator.EndsWith:
result = str.EndsWith(s);
break;
case WhereOperator.StartsWith:
result = str.StartsWith(s);
break;
case WhereOperator.GreaterThan:
result = (0 < str.CompareTo(s));
break;
case WhereOperator.LessThan:
result = (0 > str.CompareTo(s));
break;
}
}
return result;
}
private static WhereClause ParseWhere(string[] tokens, ref int i)
{
var where = new WhereClause();
++i;
where.Property = tokens[i];
++i;
var op = tokens[i].ToLowerInvariant();
switch (op)
{
case "contains":
where.Operator = WhereOperator.Contains;
break;
case "eq":
case "equals":
where.Operator = WhereOperator.Equals;
break;
case "gt":
case "greaterthan":
where.Operator = WhereOperator.GreaterThan;
break;
case "lt":
case "lessthan":
where.Operator = WhereOperator.LessThan;
break;
case "endswith":
where.Operator = WhereOperator.EndsWith;
break;
case "startswith":
where.Operator = WhereOperator.StartsWith;
break;
}
++i;
var type = ParseType(tokens[i]);
where.Type = type.Type;
where.Value = type.Value;
return where;
}
