dotnet-dynamic-linq/PoweredSoft.DynamicLinq/Fluent/Select/SelectBuilder.cs

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using System;
using System.Collections.Generic;
using System.Linq;
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using System.Text;
namespace PoweredSoft.DynamicLinq.Fluent
{
public class SelectPart
{
public string Path { get; set; }
public string PropertyName { get; set; }
public SelectTypes SelectType { get; set; }
}
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public class SelectBuilder
{
public List<SelectPart> Parts = new List<SelectPart>();
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public Type DestinationType { get; set; }
public bool Empty => Parts?.Count == 0;
protected void throwIfUsedOrEmpty(string propertyName)
{
if (string.IsNullOrEmpty(propertyName))
throw new ArgumentNullException($"{propertyName} cannot end up be empty.");
if (Parts.Any(t => t.PropertyName == propertyName))
throw new Exception($"{propertyName} is already used");
}
public SelectBuilder Key(string propertyName, string path = null)
{
if (propertyName == null)
propertyName = path.Split('.').LastOrDefault();
throwIfUsedOrEmpty(propertyName);
Parts.Add(new SelectPart
{
Path = path == null ? "Key" : $"Key.{path}",
PropertyName = propertyName,
SelectType = SelectTypes.Key
});
return this;
}
public SelectBuilder Count(string propertyName)
{
throwIfUsedOrEmpty(propertyName);
Parts.Add(new SelectPart
{
PropertyName = propertyName,
SelectType = SelectTypes.Count
});
return this;
}
public SelectBuilder LongCount(string propertyName)
{
throwIfUsedOrEmpty(propertyName);
Parts.Add(new SelectPart
{
PropertyName = propertyName,
SelectType = SelectTypes.LongCount
});
return this;
}
public SelectBuilder Sum(string path, string propertyName = null)
{
if (propertyName == null)
propertyName = path.Split('.').LastOrDefault();
throwIfUsedOrEmpty(propertyName);
Parts.Add(new SelectPart
{
Path = path,
PropertyName = propertyName,
SelectType = SelectTypes.Sum
});
return this;
}
public SelectBuilder Average(string path, string propertyName = null)
{
if (propertyName == null)
propertyName = path.Split('.').LastOrDefault();
throwIfUsedOrEmpty(propertyName);
Parts.Add(new SelectPart
{
Path = path,
PropertyName = propertyName,
SelectType = SelectTypes.Average
});
return this;
}
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public SelectBuilder ToList(string propertyName)
{
throwIfUsedOrEmpty(propertyName);
Parts.Add(new SelectPart
{
PropertyName = propertyName,
SelectType = SelectTypes.ToList
});
return this;
}
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}
}