dotnet-dynamic-linq/PoweredSoft.DynamicLinq/Fluent/Group/GroupBuilder.cs

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using System;
using System.Collections.Generic;
using System.Text;
using System.Linq;
using PoweredSoft.DynamicLinq.Helpers;
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namespace PoweredSoft.DynamicLinq.Fluent
{
public class GroupBuilder : IQueryBuilder
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{
public List<(string path, string propertyName)> Parts { get; set; } = new List<(string path, string propertyName)>();
public Type Type { get; set; }
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public bool Empty => !Parts.Any();
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public Type EqualityComparerType { get; set; }
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public IQueryable Query { get; protected set; }
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public bool IsNullCheckingEnabled { get; protected set; } = false;
public GroupBuilder(IQueryable query)
{
Query = query;
}
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public GroupBuilder Path(string path, string propertyName = null)
{
if (propertyName == null)
{
var name = path;
if (name.Contains("."))
{
var parts = name.Split('.');
name = parts[parts.Length - 1]; // the last one.
}
if (Parts.Any(t => t.propertyName == name))
throw new Exception($"{name} is already taken by another group part, you can specify a property name instead to resolve this issue");
propertyName = name;
}
Parts.Add((path, propertyName));
return this;
}
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public GroupBuilder NullChecking(bool nullChecking = true)
{
IsNullCheckingEnabled = nullChecking;
return this;
}
public GroupBuilder UseType(Type type)
{
Type = type;
return this;
}
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public GroupBuilder EqualityComparer(Type type)
{
EqualityComparerType = type;
return this;
}
public virtual IQueryable Build()
{
if (Empty)
throw new Exception("No group specified, please specify at least one group");
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var ret = QueryableHelpers.GroupBy(Query, Query.ElementType, Parts, groupToType: Type, equalityCompareType: EqualityComparerType, nullChecking: IsNullCheckingEnabled);
return ret;
}
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}
}