public void CanCreateCanonicalComparer()
{
var comparer = ComparerFactory <Product> .Create(
x => new { x.Name.Length, x.Price },
(builder, x, y) =>
{
builder
.LessThen(() => x.Length < y.Length || x.Price < y.Price)
.Equal(() => x.Length == y.Length || x.Price == y.Price)
.GreaterThan(() => x.Length > y.Length || x.Price > y.Price);
});
var products = new[]
{
new Product {
Name = "Car", Price = 7
},
new Product {
Name = "Table", Price = 3
},
new Product {
Name = "Orange", Price = 1
},
};
var sorted = products.OrderByDescending(p => p, comparer).ToList();
Assert.AreEqual(3, sorted.Count);
Assert.AreEqual("Orange", sorted.ElementAt(0).Name); // because added first
Assert.AreEqual("Car", sorted.ElementAt(1).Name); // because added first
Assert.AreEqual("Table", sorted.ElementAt(2).Name); // because ItemCount
}
/// <summary>
/// Sorts the elements of a sequence in ascending order by using a specified comparison delegate.
/// </summary>
public static IOrderedEnumerable <TSource> OrderBy <TSource, TKey>(this IEnumerable <TSource> source, Func <TSource, TKey> keySelector,
Func <TKey, TKey, int> comparison)
{
var comparer = ComparerFactory <TKey> .Create(comparison);
return(source.OrderBy(keySelector, comparer));
}
public void TestComparerFactory()
{
ComparerFactory f = new ComparerFactory();
List<TestClass1> list = new List<TestClass1>();
list.Add(new TestClass1(5, "1"));
list.Add(new TestClass1(45, "2"));
list.Add(new TestClass1(40, "233"));
list.Sort(f.New<TestClass1>("field1"));
Assert.IsTrue(list[0].field1 == 5);
Assert.IsTrue(list[1].field1 == 40);
Assert.IsTrue(list[2].field1 == 45);
List<TestClass2> list2 = new List<TestClass2>();
list2.Add(new TestClass2(new TestClass1(5, "3434")));
list2.Add(new TestClass2(new TestClass1(45, "4")));
list2.Add(new TestClass2(new TestClass1(10, "342334")));
list2.Sort(f.New<TestClass2>("class1.field1"));
Assert.IsTrue(list2[0].class1.field1 == 5);
Assert.IsTrue(list2[1].class1.field1 == 10);
Assert.IsTrue(list2[2].class1.field1 == 45);
}
public void TestComparerFactory()
{
ComparerFactory f = new ComparerFactory();
List <TestClass1> list = new List <TestClass1>();
list.Add(new TestClass1(5, "1"));
list.Add(new TestClass1(45, "2"));
list.Add(new TestClass1(40, "233"));
list.Sort(f.New <TestClass1>("field1"));
Assert.IsTrue(list[0].field1 == 5);
Assert.IsTrue(list[1].field1 == 40);
Assert.IsTrue(list[2].field1 == 45);
List <TestClass2> list2 = new List <TestClass2>();
list2.Add(new TestClass2(new TestClass1(5, "3434")));
list2.Add(new TestClass2(new TestClass1(45, "4")));
list2.Add(new TestClass2(new TestClass1(10, "342334")));
list2.Sort(f.New <TestClass2>("class1.field1"));
Assert.IsTrue(list2[0].class1.field1 == 5);
Assert.IsTrue(list2[1].class1.field1 == 10);
Assert.IsTrue(list2[2].class1.field1 == 45);
}
public bool Equal(Object x, Object y, ColumnType type, string tolerance)
{
var comparer = new ComparerFactory().Get(type);
var res = comparer.Compare(x, y, ToleranceFactory.Instantiate(type, tolerance));
return(res.AreEqual);
}
internal static ComparsionDelegate <T1, T2> Create(MatchingMemberInfo <T1, T2> mmi, IConfiguration configuration)
{
var leftType = mmi.LeftSideItem.MemberType;
var rightType = mmi.RightSideItem.MemberType;
var factory = new ComparerFactory(configuration);
var comparer = typeof(ComparerFactory)
.GetMethod(nameof(ComparerFactory.Create), BindingFlags.Instance | BindingFlags.NonPublic)
?.MakeGenericMethod(leftType, rightType)
.Invoke(factory, null);
var itemCompareMethodInfo = comparer.GetType().GetMethod("Compare");
ComparsionResult Func(int level, T1 a, T2 b)
=> CompareFunc(
mmi.Name,
configuration.MaxNestingLevel,
mmi.LeftSideItem.GetValueFunc,
mmi.RightSideItem.GetValueFunc,
leftType.Name,
rightType.Name,
itemCompareMethodInfo,
comparer,
level, a, b);
return(Func);
}
public void ComparerFromFactory()
{
var values = new int[] { 3, 5, 2, 4, 2, 1 };
var comparer = ComparerFactory.Create <int>((x, y) => y <= x);
CollectionAssert.AreEqual(new[] { 5, 4, 3, 2, 2, 1 }, values.OrderBy(x => x, comparer).ToArray());
}
static void Main(string[] args)
{
var list = new List <int>();
list.Sort(new ComparerDelegate <int>((x, y) => x - y)); //using without factory
list.Sort(ComparerFactory.Create <int>((x, y) => x - y)); //using with factory
}
protected virtual IComparer <Item> GetComparer(ID id, Database database, Item item = null)
{
if (!this.Comparers.ContainsKey(id))
{
this.Comparers[id] = ComparerFactory.GetComparer(item ?? database.GetItem(id));
}
return(this.Comparers[id]);
}
private static void MeasureIntPropertyClassComparasions()
{
var tuples = GenerateRandomIntPropertyClassPairs();
var value = MeasureComparer(new IntPropertyClassEqualityComparer(), tuples);
var valueReflection = MeasureComparer(ComparerFactory.CreateRecursiveReflectionComparer <IntPropertyClass>(), tuples);
Console.WriteLine($"{NumberOfCompares} comparasions. Native comparer: {value} miliseconds, " +
$"reflection comparer: {valueReflection} miliseconds. ");
}
public void IsSorted_CustomComparerWithNullEnumerable_ViolatesPrecondition()
{
// Arrange
SCG.IEnumerable <int> enumerable = null;
var comparer = ComparerFactory.CreateComparer <int>((x, y) => x.CompareTo(y));
// Act & Assert
// ReSharper disable once ExpressionIsAlwaysNull
Assert.That(() => enumerable.IsSorted(comparer), Violates.PreconditionSaying(ArgumentMustBeNonNull));
}
public void CreateComparerFromExpression()
{
var comparer = ComparerFactory <Person> .Create(x => x.Age);
comparer.Compare(new Person {
Age = 1
}, new Person {
Age = 1
})
.Should().Be(0);
}
public void IsSorted_CustomComparer_IsNotSorted(int[] array)
{
// Arrange
var comparer = ComparerFactory.CreateComparer <int>((x, y) => x.CompareTo(y));
// Act
var isSorted = array.IsSorted(comparer);
// Assert
Assert.That(isSorted, Is.False);
}
public void UnsequenceEqual_CustomComparerNotEquals_False(int[] first, int[] second)
{
// Arrange
var comparer = ComparerFactory.CreateEqualityComparer((x, y) => x == y, (int x) => x.GetHashCode());
// Act
var result = first.UnsequenceEqual(second, comparer);
// Assert
Assert.That(result, Is.False);
}
public void IsSorted_ReversedComparer_IsSortedInReverse(int[] array)
{
// Arrange
var comparer = ComparerFactory.CreateComparer <int>((x, y) => y.CompareTo(x));
// Act
var isSorted = array.IsSorted(comparer);
// Assert
Assert.That(isSorted, Is.True);
}
public void EqualityComparer_CustomEqualityComparer_Equal()
{
// Arrange
var customEqualityComparer = ComparerFactory.CreateEqualityComparer <int>((i, j) => i == j, i => i);
var collection = GetEmptyExtensible(customEqualityComparer);
// Act
var equalityComparer = collection.EqualityComparer;
// Assert
Assert.That(equalityComparer, Is.SameAs(customEqualityComparer));
}
public void Constructor_EqualityComparer_EqualsGivenEqualityComparer()
{
// Arrange
var customEqualityComparer = ComparerFactory.CreateEqualityComparer <int>((i, j) => i == j, i => i);
// Act
var list = new ArrayList <int>(equalityComparer: customEqualityComparer);
var equalityComparer = list.EqualityComparer;
// Assert
Assert.That(equalityComparer, Is.SameAs(customEqualityComparer));
}
// Fast for array lists and similar, but not stable; slow for linked lists
public static ArrayList <int> GetPermutation1 <T>(IList <T> lst)
where T : IComparable <T>
{
ArrayList <int> res = new ArrayList <int>(lst.Count);
for (int i = 0; i < lst.Count; i++)
{
res.Add(i);
}
res.Sort(ComparerFactory <int> .CreateComparer((i, j) => lst[i].CompareTo(lst[j])));
return(res);
}
private static SCG.IEqualityComparer <T> GetIdenticalityComparer <T>()
{
if (!typeof(T).IsValueType)
{
return(ComparerFactory.CreateReferenceEqualityComparer <T>());
}
if (typeof(T).IsPrimitive)
{
return(SCG.EqualityComparer <T> .Default);
}
return(CreateStructComparer <T>());
}
public void UnsequenceEqual_EqualHashCodesNotEquals_False(int[] first, int[] second)
{
// Arrange
Func <int, int, bool> equals = (x, y) => x == y;
Func <int, int> getEqualHashCode = x => 0;
var comparer = ComparerFactory.CreateEqualityComparer(equals, getEqualHashCode);
// Act
var result = first.UnsequenceEqual(second, comparer);
// Assert
Assert.That(result, Is.False);
}
public void CanCompareSelectedValue()
{
var comparer = ComparerFactory <User> .Create(x => x.Age);
Assert.That.Comparer().IsCanonical
(
value: new User(20),
less: new User(15),
equal: new User(20),
greater: new User(30),
comparer
);
Assert.IsTrue(comparer.Compare(default, new User(0)) < 0);
public void UnsequenceEqual_IntialComparer_True(string[] first, string[] second, bool expectedResult)
{
// Arrange
Func <string, string> firstLetterOrEmpty = s => string.IsNullOrEmpty(s) ? string.Empty : s.Substring(0, 1);
Func <string, string, bool> equals = (x, y) => firstLetterOrEmpty(x).Equals(firstLetterOrEmpty(y));
Func <string, int> getHashCode = x => firstLetterOrEmpty(x).GetHashCode();
var comparer = ComparerFactory.CreateEqualityComparer(equals, getHashCode);
// Act
var result = first.UnsequenceEqual(second, comparer);
// Assert
Assert.That(result, Is.EqualTo(expectedResult));
}
public void CanCreateComparer1()
{
var comparer = ComparerFactory <Product> .Create(
x => x.Price,
(builder, x, y) =>
{
builder
.LessThen(() => x < y)
.Equal(() => x == y)
.GreaterThan(() => x > y);
});
var products = new[]
{
new Product {
Name = "Car", Price = 7
},
new Product {
Name = "Table", Price = 3
},
new Product {
Name = "Orange", Price = 1
},
};
Assert.That.Comparer().IsCanonical
(
new Product {
Price = 3
},
new Product {
Price = 2
},
new Product {
Price = 3
},
new Product {
Price = 4
},
comparer
);
var sorted = products.OrderByDescending(p => p, comparer).ToList();
Assert.AreEqual("Car", sorted.ElementAt(0).Name);
Assert.AreEqual("Table", sorted.ElementAt(1).Name);
Assert.AreEqual("Orange", sorted.ElementAt(2).Name);
}
public static void SortLists()
{
var employees = new List <Employee>();
var employeeByIdComparer = new EmployeeByIdComparer();
Comparison <Employee> comparison = (x, y) => x.Id.CompareTo(x.Id);
employees.Sort(employeeByIdComparer);
employees.Sort(comparison);
var set = new SortedSet <Employee>(employeeByIdComparer);
var comparer = ComparerFactory.Create(comparison);
var set1 = new SortedSet <Employee>(comparer);
}
public void Keys_returns_GuardedSorted()
{
var reverse = ComparerFactory <int> .CreateComparer((a, b) => a > b? -1 : 1);
var source = new SortedArrayDictionary <int, string>(reverse)
{
[1] = "one",
[2] = "two",
[3] = "three"
};
var guarded = new GuardedSortedDictionary <int, string>(source);
Assert.IsAssignableFrom <GuardedSorted <int> >(guarded.Keys);
}
public void Values_returns_Values()
{
var reverse = ComparerFactory <int> .CreateComparer((a, b) => a > b? -1 : 1);
var source = new SortedArrayDictionary <int, string>(reverse)
{
[1] = "one",
[2] = "two",
[3] = "three"
};
var guarded = new GuardedSortedDictionary <int, string>(source);
CollectionAssert.AreEquivalent(new[] { "one", "two", "three" }, guarded.Values);
}
public int Compare(T x, T y)
{
var comparers = ComparerFactory.GetComparers <T>();
foreach (var comparer in comparers)
{
var comparisionResult = comparer.Compare(x, y);
if (comparisionResult.FoundResult)
{
return(comparisionResult.Result);
}
}
return(ComparerFactory.GetDefaultComparer <T>().Compare(x, y));
}
public void Add_ManyItems_Equivalent()
{
// Arrange
var referenceEqualityComparer = ComparerFactory.CreateReferenceEqualityComparer <string>();
var collection = GetEmptyExtensible(referenceEqualityComparer);
var count = Random.Next(100, 250);
var items = GetStrings(Random, count);
// Act
foreach (var item in items)
{
collection.Add(item); // TODO: Verify that items were added?
}
// Assert
Assert.That(collection, Is.EquivalentTo(items));
}
private IPriorityQueue <int> InitializePriorityQueue()
{
IComparer <int> weightComparer = ComparerFactory <int> .CreateComparer(
(a, b) => _distance[a].CompareTo(_distance[b]));
IPriorityQueue <int> priorityQueue =
new IntervalHeap <int>(weightComparer);
_queueItemHandles = new IPriorityQueueHandle <int> [_nodes.Count];
for (var i = 0; i < _nodes.Count; i++)
{
IPriorityQueueHandle <int> itemHandle = null;
priorityQueue.Add(ref itemHandle, i);
_queueItemHandles[i] = itemHandle;
}
return(priorityQueue);
}
public static void Main(String[] args)
{
// SortedArray<Object> sarr = new SortedArray<Object>();
var lexico = ComparerFactory <Rec <string, int> > .CreateComparer(
(r1, r2) =>
{
int order = r1.X1.CompareTo(r2.X1);
return(order == 0 ? r1.X2.CompareTo(r2.X2) : order);
}
);
SortedArray <Rec <string, int> > sarr = new SortedArray <Rec <string, int> >(lexico);
sarr.Add(new Rec <string, int>("ole", 32));
sarr.Add(new Rec <string, int>("hans", 77));
sarr.Add(new Rec <string, int>("ole", 63));
foreach (Rec <string, int> r in sarr)
{
Console.WriteLine(r);
}
}
public static void Main()
{
var lexico = ComparerFactory <Rec <string, int> > .CreateComparer(
(r1, r2) =>
{
int order = r1.X1.CompareTo(r2.X1);
return(order == 0 ? r1.X2.CompareTo(r2.X2) : order);
}
);
SortedArray <Rec <string, int> > sarr = new SortedArray <Rec <string, int> >(lexico)
{
new Rec <string, int>("ole", 32),
new Rec <string, int>("hans", 77),
new Rec <string, int>("ole", 63)
};
foreach (var r in sarr)
{
Console.WriteLine(r);
}
}