/
NoNestedCountAggregationsRule.cs
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/
NoNestedCountAggregationsRule.cs
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#region license
/*
Copyright 2005 - 2021 Advantage Solutions, s. r. o.
This file is part of ORIGAM (http://www.origam.org).
ORIGAM is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
ORIGAM is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with ORIGAM. If not, see <http://www.gnu.org/licenses/>.
*/
#endregion
using System;
using Origam.DA.ObjectPersistence;
using Origam.Schema.EntityModel;
namespace Origam.DA.EntityModel
{
[AttributeUsage(AttributeTargets.Property, AllowMultiple=false, Inherited=true)]
public class NoNestedCountAggregationsRule : AbstractModelElementRuleAttribute
{
public override Exception CheckRule(object instance)
{
if (!(instance is AggregatedColumn aggregatedColumn))
{
throw new Exception(
$"{nameof(NoNestedCountAggregationsRule)} can be only applied to type {nameof(AggregatedColumn)}");
}
if (!(aggregatedColumn.Field is AggregatedColumn referencedColumn))
{
return null;
}
if (aggregatedColumn.AggregationType != referencedColumn.AggregationType &&
aggregatedColumn.AggregationType != AggregationType.Sum &&
referencedColumn.AggregationType != AggregationType.Count ||
aggregatedColumn.AggregationType == AggregationType.Count &&
referencedColumn.AggregationType == AggregationType.Count)
{
return new Exception(
$"Nested aggregation error. Column must have the property {nameof(AggregationType)} set to the same\n" +
$"value as {nameof(AggregationType)} of the field it references \"{referencedColumn.Name}\"\n" +
"The only exception is a combination of Count(Count()) which is not allowed and should be\n" +
"replaced by Sum(Count()) to calculate the total count.");
}
return null;
}
public override Exception CheckRule(object instance, string memberName)
{
return CheckRule(instance);
}
}
}