private bool WriteGroup(EntityFilter entityFilter)
{
var hasGroup = entityFilter.Filters != null && entityFilter.Filters.Any();
if (!hasGroup)
{
return(false);
}
var logic = string.IsNullOrWhiteSpace(entityFilter.Logic) ? "and" : entityFilter.Logic;
var wroteFirst = false;
_expression.Append("(");
foreach (var filter in entityFilter.Filters)
{
if (wroteFirst)
{
_expression.Append($" {logic} ");
}
Visit(filter);
wroteFirst = true;
}
_expression.Append(")");
return(true);
}
public void Build(EntityFilter entityFilter)
{
_expression.Length = 0;
_values.Clear();
Visit(entityFilter);
}
private void Visit(EntityFilter entityFilter)
{
if (WriteGroup(entityFilter))
{
return;
}
WriteExpression(entityFilter);
}
private void WriteExpression(EntityFilter entityFilter)
{
int index = _values.Count;
var name = entityFilter.Name;
var value = entityFilter.Value;
var o = string.IsNullOrWhiteSpace(entityFilter.Operator) ? "==" : entityFilter.Operator;
_operatorMap.TryGetValue(o, out string comparison);
if (string.IsNullOrEmpty(comparison))
{
comparison = o.Trim();
}
var negation = comparison.StartsWith("!") || comparison.StartsWith("not", StringComparison.OrdinalIgnoreCase) ? "!" : string.Empty;
if (comparison.EndsWith("StartsWith", StringComparison.OrdinalIgnoreCase))
{
_expression.Append($"{negation}{name}.StartsWith(@{index})");
}
else if (comparison.EndsWith("EndsWith", StringComparison.OrdinalIgnoreCase))
{
_expression.Append($"{negation}{name}.EndsWith(@{index})");
}
else if (comparison.EndsWith("Contains", StringComparison.OrdinalIgnoreCase))
{
_expression.Append($"{negation}{name}.Contains(@{index})");
}
else
{
_expression.Append($"{name} {comparison} @{index}");
}
_values.Add(value);
}