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

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using PoweredSoft.DynamicLinq.Helpers;
using System;
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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; }
public SelectCollectionHandling SelectCollectionHandling { get; set; }
}
public class SelectBuilder : IQueryBuilder
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{
public List<SelectPart> Parts = new List<SelectPart>();
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public Type DestinationType { get; set; }
public bool Empty => Parts?.Count == 0;
public IQueryable Query { get; protected set; }
public bool IsNullCheckingEnabled { get; protected set; }
public SelectBuilder(IQueryable query)
{
Query = query;
}
public SelectBuilder NullChecking(bool check = true)
{
IsNullCheckingEnabled = check;
return this;
}
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;
}
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public SelectBuilder Path(string path, string propertyName = null)
{
if (propertyName == null)
propertyName = path.Split('.').LastOrDefault();
ThrowIfUsedOrEmpty(propertyName);
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Parts.Add(new SelectPart
{
Path = path,
PropertyName = propertyName,
SelectType = SelectTypes.Path
});
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;
}
public SelectBuilder PathToList(string path, string propertyName = null, SelectCollectionHandling selectCollectionHandling = SelectCollectionHandling.LeaveAsIs)
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{
if (propertyName == null)
propertyName = path.Split('.').LastOrDefault();
ThrowIfUsedOrEmpty(propertyName);
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Parts.Add(new SelectPart
{
Path = path,
PropertyName = propertyName,
SelectType = SelectTypes.PathToList,
SelectCollectionHandling = selectCollectionHandling
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});
return this;
}
public virtual IQueryable Build()
{
if (Empty)
throw new Exception("No select specified, please specify at least one select path");
var partsTuple = Parts.Select(t => (selectType: t.SelectType, propertyName: t.PropertyName, path: t.Path, selectCollectionHandling: t.SelectCollectionHandling)).ToList();
return QueryableHelpers.Select(Query, partsTuple, DestinationType, nullChecking: IsNullCheckingEnabled);
}
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}
}