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using System;
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using System.Collections.Generic;
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using System.Linq;
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using System.Text;
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using System.Threading.Tasks;
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using Connected.Expressions;
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using Connected.Data.Sql;
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using Connected.Expressions.Translation;
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using System.Linq.Expressions;
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using Connected.Data.Storage;
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using System.Collections;
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using System.Reflection;
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using Connected.Entities;
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namespace Connected.Data.Tests.Translation;
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[TestClass]
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public class TranslatorTests
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{
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[TestMethod]
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public void Translator_GeneratesBasicSelectExpression_UsingTSQL()
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{
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var context = new ExpressionCompilationContext(new TSqlLanguage());
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var translator = new Translator(context);
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var data = SampleData.All();
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var dataQueryable = data.AsQueryable();
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var query = (from x in dataQueryable select x);
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var operatorMethodInfo = QueryableMethods.SingleOrDefaultWithoutPredicate;
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if (operatorMethodInfo.IsGenericMethod)
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{
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operatorMethodInfo = operatorMethodInfo.GetGenericArguments().Length == 2
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? operatorMethodInfo.MakeGenericMethod(typeof(DummyEntity), typeof(DummyEntity).GetGenericArguments().Single())
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: operatorMethodInfo.MakeGenericMethod(typeof(DummyEntity));
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}
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var expr = Expression.Call(instance: null, method: operatorMethodInfo, arguments: new[] { query.Expression });
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var result = translator.Translate(expr) as ProjectionExpression;
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var select = result.Select;
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Assert.IsInstanceOfType(select, typeof(SelectExpression));
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Assert.IsInstanceOfType(select.From, typeof(TableExpression));
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Assert.IsNull(select.Where, "Where should be null");
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Assert.IsNull(select.Take, "Take should be null");
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Assert.IsNull(select.Skip, "Skip should be null");
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Assert.AreEqual(0, select.GroupBy.Count);
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Assert.IsFalse(select.IsReverse);
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}
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[TestMethod]
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public void Translator_GeneratesSelectExpression_WithWhere_UsingTSQL()
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{
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var context = new ExpressionCompilationContext(new TSqlLanguage());
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var translator = new Translator(context);
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var data = SampleData.All();
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var dataQueryable = data.AsQueryable();
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var query = (from x in dataQueryable where x.Id == 1 select x);
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var operatorMethodInfo = QueryableMethods.SingleOrDefaultWithoutPredicate;
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if (operatorMethodInfo.IsGenericMethod)
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{
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operatorMethodInfo = operatorMethodInfo.GetGenericArguments().Length == 2
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? operatorMethodInfo.MakeGenericMethod(typeof(DummyEntity), typeof(DummyEntity).GetGenericArguments().Single())
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: operatorMethodInfo.MakeGenericMethod(typeof(DummyEntity));
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}
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var expr = Expression.Call(instance: null, method: operatorMethodInfo, arguments: new[] { query.Expression });
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var result = translator.Translate(expr) as ProjectionExpression;
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var select = result.Select;
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Assert.IsInstanceOfType(select, typeof(SelectExpression));
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Assert.IsInstanceOfType(select.From, typeof(TableExpression));
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Assert.IsNotNull(select.Where, "Where should not be null");
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Assert.IsNull(select.Take, "Take should be null");
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Assert.IsNull(select.Skip, "Skip should be null");
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Assert.AreEqual(0, select.GroupBy.Count);
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Assert.IsFalse(select.IsReverse);
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}
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}
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public record DummyEntity : Entity<long>;
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internal static class SampleData
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{
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public static List<DummyEntity> All()
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{
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return new List<DummyEntity>
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{
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new DummyEntity{ Id = 1},
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new DummyEntity{ Id = 2},
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new DummyEntity{ Id = 3},
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new DummyEntity{ Id = 4},
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new DummyEntity{ Id = 5}
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};
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}
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}
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internal static class QueryableMethods
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{
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static QueryableMethods()
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{
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var queryableMethodGroups = typeof(Queryable)
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.GetMethods(BindingFlags.Public | BindingFlags.Static | BindingFlags.DeclaredOnly)
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.GroupBy(mi => mi.Name)
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.ToDictionary(e => e.Key, l => l.ToList());
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SingleWithoutPredicate = GetMethod(nameof(Queryable.Single), 1, types => new[] { typeof(IQueryable<>).MakeGenericType(types[0]) });
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SingleOrDefaultWithoutPredicate = GetMethod(nameof(Queryable.SingleOrDefault), 1, types => new[] { typeof(IQueryable<>).MakeGenericType(types[0]) });
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MethodInfo GetMethod(string name, int genericParameterCount, Func<Type[], Type[]> parameterGenerator)
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{
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return queryableMethodGroups[name].Single(mi => ((genericParameterCount == 0 && !mi.IsGenericMethod)
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|| (mi.IsGenericMethod && mi.GetGenericArguments().Length == genericParameterCount))
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&& mi.GetParameters().Select(e => e.ParameterType).SequenceEqual(parameterGenerator(mi.IsGenericMethod ? mi.GetGenericArguments() : Array.Empty<Type>())));
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}
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}
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public static MethodInfo SingleWithoutPredicate { get; }
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public static MethodInfo SingleOrDefaultWithoutPredicate { get; }
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}
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Matija Koželj
2 years ago