/// <summary>
/// visit a comparison expression
/// </summary>
/// <param name="context"></param>
/// <returns></returns>
public override Expression <Func <T, bool> > VisitComparison(RSqlQueryParser.ComparisonContext context)
{
var comparator = context.comparator().GetText().ToLowerInvariant();
switch (comparator)
{
case "=is-null=":
case "=nil=":
return(RSqlQueryExpressionHelper.GetIsNullExpression <T>(_parameter, context, _jsonNamingPolicy));
case "==":
case "=eq=":
return(RSqlQueryExpressionHelper.GetEqExpression <T>(_parameter, context, _jsonNamingPolicy));
case "!=":
case "=neq=":
return(RSqlQueryExpressionHelper.GetNeqExpression <T>(_parameter, context, _jsonNamingPolicy));
case "<":
case "=lt=":
return(RSqlQueryExpressionHelper.GetLtExpression <T>(_parameter, context, _jsonNamingPolicy));
case "<=":
case "=le=":
return(RSqlQueryExpressionHelper.GetLeExpression <T>(_parameter, context, _jsonNamingPolicy));
case ">":
case "=gt=":
return(RSqlQueryExpressionHelper.GetGtExpression <T>(_parameter, context, _jsonNamingPolicy));
case ">=":
case "=ge=":
return(RSqlQueryExpressionHelper.GetGeExpression <T>(_parameter, context, _jsonNamingPolicy));
case "=in=":
return(RSqlQueryExpressionHelper.GetInExpression <T>(_parameter, context, _jsonNamingPolicy));
case "=out=":
return(RSqlQueryExpressionHelper.GetOutExpression <T>(_parameter, context, _jsonNamingPolicy));
default:
throw new ComparisonUnknownComparatorException(context);
}
}
/// <summary>
/// build specification from RSql query
/// </summary>
/// <param name="queryCollection"></param>
/// <returns></returns>
public IRSqlQuery <T> Build(IQueryCollection queryCollection)
{
if (queryCollection == null)
{
throw new ArgumentNullException(nameof(queryCollection));
}
var queryField =
_options.Value.JsonSerializerOptions.PropertyNamingPolicy.ConvertName(_settings.QueryField);
if (
!queryCollection.TryGetValue(queryField, out var query) ||
string.IsNullOrWhiteSpace(query.FirstOrDefault()))
{
return(new RSqlQuery <T>(RSqlQueryExpressionHelper.True <T>()));
}
var result = CreateAndAddCacheQuery(query.FirstOrDefault());
if (_logger.IsEnabled(LogLevel.Debug))
{
_logger.LogDebug($"RSqlQuery<{typeof(T).FullName}> query: ?{queryField}={query.FirstOrDefault()} -> {result.Value()}");
}
return(result);
}
/// <summary>
/// visit a and expression
/// </summary>
/// <param name="context"></param>
/// <returns></returns>
public override Expression <Func <T, bool> > VisitAnd(RSqlQueryParser.AndContext context)
{
return(RSqlQueryExpressionHelper.GetAndExpression(this, context));
}
