private bool ShouldConvertValues(BinaryCriteria criteria, out Field field, out object value)
{
field = null;
value = null;
if (ReferenceEquals(null, criteria) ||
criteria.Operator < CriteriaOperator.EQ ||
criteria.Operator > CriteriaOperator.NotIn)
return false;
var left = criteria.LeftOperand as Criteria;
if (ReferenceEquals(null, left))
return false;
field = FindField(left.Expression);
if (ReferenceEquals(null, field))
return false;
if (field is StringField)
return false;
var right = criteria.RightOperand as ValueCriteria;
if (ReferenceEquals(null, right))
return false;
value = right.Value;
return value != null;
}
protected override BaseCriteria VisitBinary(BinaryCriteria criteria)
{
if (ShouldConvertValues(criteria, out Field field, out object value))
{
try
{
var str = value as string;
if (str == null && value is IEnumerable)
{
var values = new List <object>();
foreach (var v in value as IEnumerable)
{
values.Add(field.ConvertValue(v, CultureInfo.InvariantCulture));
}
return(new BinaryCriteria(new Criteria(field), criteria.Operator, new ValueCriteria(values)));
}
if (str == null || str.Length != 0)
{
value = field.ConvertValue(value, CultureInfo.InvariantCulture);
return(new BinaryCriteria(new Criteria(field), criteria.Operator, new ValueCriteria(value)));
}
}
catch
{
// swallow exceptions for backward compability
}
}
return(base.VisitBinary(criteria));
}
protected override BaseCriteria VisitBinary(BinaryCriteria criteria)
{
Field field;
object value;
if (ShouldConvertValues(criteria, out field, out value))
try
{
var str = value as string;
if (str == null && value is IEnumerable)
{
var values = new List<object>();
foreach (var v in value as IEnumerable)
values.Add(field.ConvertValue(v, CultureInfo.InvariantCulture));
return new BinaryCriteria(new Criteria(field), criteria.Operator, new ValueCriteria(values));
}
if (str == null || str.Length != 0)
{
value = field.ConvertValue(value, CultureInfo.InvariantCulture);
return new BinaryCriteria(new Criteria(field), criteria.Operator, new ValueCriteria(value));
}
}
catch
{
// swallow exceptions for backward compability
}
return base.VisitBinary(criteria);
}
protected virtual BaseCriteria VisitBinary(BinaryCriteria criteria)
{
var left = this.Visit(criteria.LeftOperand);
var right = this.Visit(criteria.RightOperand);
if (!Object.ReferenceEquals(left, criteria.LeftOperand) ||
!Object.ReferenceEquals(right, criteria.RightOperand))
{
return new BinaryCriteria(left, criteria.Operator, right);
}
return criteria;
}
/// <summary>
/// Visits the binary criteria. Binary criteria is one with
/// two operands and an operator between.
/// </summary>
/// <param name="criteria">The binary criteria.</param>
/// <returns></returns>
protected virtual BaseCriteria VisitBinary(BinaryCriteria criteria)
{
var left = Visit(criteria.LeftOperand);
var right = Visit(criteria.RightOperand);
if (!Object.ReferenceEquals(left, criteria.LeftOperand) ||
!Object.ReferenceEquals(right, criteria.RightOperand))
{
return(new BinaryCriteria(left, criteria.Operator, right));
}
return(criteria);
}
private bool ShouldConvertValues(BinaryCriteria criteria, out Field field, out object value)
{
field = null;
value = null;
if (ReferenceEquals(null, criteria) ||
criteria.Operator < CriteriaOperator.EQ ||
criteria.Operator > CriteriaOperator.NotIn)
{
return(false);
}
var left = criteria.LeftOperand as Criteria;
if (ReferenceEquals(null, left))
{
return(false);
}
field = FindField(left.Expression);
if (ReferenceEquals(null, field))
{
return(false);
}
if (field is StringField)
{
return(false);
}
var right = criteria.RightOperand as ValueCriteria;
if (ReferenceEquals(null, right))
{
return(false);
}
value = right.Value;
return(value != null);
}
private bool ShouldConvertValues(BinaryCriteria criteria, out Field field, out object value)
{
field = null;
value = null;
if (criteria is null ||
criteria.Operator < CriteriaOperator.EQ ||
criteria.Operator > CriteriaOperator.NotIn)
{
return(false);
}
if (!(criteria.LeftOperand is Criteria left))
{
return(false);
}
field = FindField(left.Expression);
if (field is null)
{
return(false);
}
if (field is StringField)
{
return(false);
}
if (!(criteria.RightOperand is ValueCriteria right))
{
return(false);
}
value = right.Value;
return(value != null);
}
public static TFields As <TFields>(this TFields fields, string alias)
where TFields : RowFieldsBase, new()
{
Check.NotNullOrWhiteSpace(alias, "alias");
if ((alias == "t0" || alias == "T0") &&
(fields.alias == "t0" || fields.alias == "T0"))
{
return(fields);
}
if (fields.AliasName != "t0" && fields.AliasName != "T0")
{
throw new ArgumentException("You can't alias fields that are already aliased once!");
}
var key = new Tuple <Type, string>(typeof(TFields), alias);
RowFieldsBase cached;
if (cache.TryGetValue(key, out cached))
{
return((TFields)cached);
}
var result = new TFields();
result.Initialize();
var aliasPrefix = alias + "_";
var joinByKey = new HashSet <string>(result.joins.Keys, StringComparer.OrdinalIgnoreCase);
Func <string, string> mapAlias = x =>
{
if (x == "t0" || x == "T0")
{
return(alias);
}
if (!joinByKey.Contains(x))
{
return(x);
}
return(aliasPrefix + x);
};
Func <string, string> mapExpression = x =>
{
if (x == null)
{
return(null);
}
return(JoinAliasLocator.ReplaceAliases(x, mapAlias));
};
foreach (var field in result)
{
field.expression = mapExpression(field.expression);
if (field.referencedAliases != null && field.ReferencedAliases.Count > 0)
{
var old = field.ReferencedAliases.ToArray();
field.ReferencedAliases.Clear();
foreach (var x in old)
{
field.ReferencedAliases.Add(mapAlias(x));
}
}
field.join = null;
field.joinAlias = field.joinAlias == null ? null : mapAlias(field.joinAlias);
}
var oldJoins = result.joins.ToArray();
result.joins.Clear();
foreach (var join in oldJoins)
{
BaseCriteria onCriteria;
var bc = join.Value.OnCriteria as BinaryCriteria;
if (!ReferenceEquals(null, bc))
{
onCriteria = new BinaryCriteria(
new Criteria(mapExpression(bc.LeftOperand.ToString())),
bc.Operator,
new Criteria(mapExpression(bc.RightOperand.ToString())));
}
else
{
if (ReferenceEquals(null, join.Value.OnCriteria))
{
onCriteria = null;
}
else
{
onCriteria = new Criteria(mapExpression(join.Value.OnCriteria.ToString()));
}
}
new ReplacedJoin(result.Joins,
mapExpression(join.Value.Table),
mapAlias(join.Value.Name),
onCriteria,
join.Value.GetKeyword());
}
result.alias = alias;
result.aliasDot = alias + ".";
cache[key] = result;
return(result);
}
