public void UniversalComparer_Function()
{
UniversalComparer <int> comparer
= new UniversalComparer <int>
(
(left, right) => left - right
);
Func <int, int, int> func = comparer.Function;
Assert.IsTrue
(
0 ==
func(1, 1)
);
Assert.IsTrue
(
0 <
func(2, 1)
);
Assert.IsTrue
(
0 >
func(1, 2)
);
}
public IEqualityComparer <T> CreateCompleteComparer <T>()
{
object comparer;
if (!_completeComparerCache.TryGetValue(typeof(T), out comparer))
{
var properties = _propertyProvider.GetProperties <T>();
var equality = CreateEqualityFunction <T>(properties);
var hashCode = CreateHashCodeFunction <T>(properties);
_completeComparerCache[typeof(T)] = comparer = new UniversalComparer <T>(equality, hashCode);
}
return((IEqualityComparer <T>)comparer);
}
public void TestNullable()
{
Person person1 = new Person(new Person(null, 'a', 2), null, 1);
Person person2 = new Person(new Person(null, 'b', 2), 'a', 2);
Person person3 = new Person(new Person(null, 'c', 2), 'b', 3);
Person person4 = new Person(new Person(null, 'd', 2), 'c', 4);
UniversalComparer uc = new UniversalComparer("id1 asc", true);
Person[] persons = { person1, person2, person3, person4 };
Array.Sort(persons, uc);
Assert.AreEqual(persons[0].id1, null);
}
public void TestAscDesc()
{
Person person1 = new Person('a', 4);
Person person2 = new Person('b', 3);
Person person3 = new Person('c', 2);
Person person4 = new Person('d', 1);
Person person5 = new Person('e', 11);
UniversalComparer uc = new UniversalComparer("id1 desc, id2", true);
Person[] persons = { person1, person2, person3, person4, person5 };
Array.Sort(persons, uc);
Assert.AreEqual(persons[0].id1, 'e');
Assert.AreEqual(persons.Last().id1, 'a');
}
public void TestInnerProperty()
{
Person person1 = new Person(new Person(null, 'a', 2), null, 1);
Person person2 = new Person(new Person(null, 'b', 2), 'a', 2);
Person person3 = new Person(new Person(null, 'c', 2), 'b', 3);
Person person4 = new Person(new Person(null, 'd', 2), 'c', 4);
UniversalComparer uc = new UniversalComparer("born.Millisecond");
Person[] persons = { person1, person2, person3, person4 };
Array.Sort(persons, uc);
int smallest = person1.born.Millisecond;
foreach (var person in persons)
{
if (person.born.Millisecond < smallest)
{
smallest = person.born.Millisecond;
}
}
}
public void UniversalComparer_Compare()
{
UniversalComparer <int> comparer
= new UniversalComparer <int>
(
(left, right) => left - right
);
Assert.IsTrue
(
0 ==
comparer.Compare(1, 1)
);
Assert.IsTrue
(
0 <
comparer.Compare(2, 1)
);
Assert.IsTrue
(
0 >
comparer.Compare(1, 2)
);
}
