static PropertyCompare()
{
PropertyInfo[] properties = typeof(T).GetProperties(BindingFlags.Instance | BindingFlags.Public);
var firstObject = Expression.Parameter(typeof(T), "a");
var secondObject = Expression.Parameter(typeof(T), "b");
PropertyComparer <T>[] propertyComparers = new PropertyComparer <T> [properties.Length];
for (int i = 0; i < properties.Length; i++)
{
PropertyInfo thisProperty = properties[i];
Expression arePropertiesEqual = Expression.Equal(Expression.Property(firstObject, thisProperty), Expression.Property(secondObject, thisProperty));
Expression <Func <T, T, bool> > equalityFunc = Expression.Lambda <Func <T, T, bool> >(arePropertiesEqual, firstObject, secondObject);
PropertyComparer <T> comparer = new PropertyComparer <T>()
{
Compare = equalityFunc.Compile(),
PropertyName = properties[i].Name
};
propertyComparers[i] = comparer;
}
ChangedProps = new Func <T, T, List <string> >((a, b) =>
{
List <string> changedFields = new List <string>();
foreach (PropertyComparer <T> comparer in propertyComparers)
{
if (comparer.Compare(a, b))
{
continue;
}
changedFields.Add(comparer.PropertyName);
}
return(changedFields);
});
}
public void TestCompareThroughRelationship()
{
//---------------Set up test pack-------------------
Car car1 = new Car();
car1.CarRegNo = "5";
Car car2 = new Car();
car2.CarRegNo = "2";
Engine engine1 = new Engine();
engine1.CarID = car1.CarID;
engine1.EngineNo = "20";
Engine engine2 = new Engine();
engine2.CarID = car2.CarID;
engine2.EngineNo = "50";
ITransactionCommitter committer = BORegistry.DataAccessor.CreateTransactionCommitter();
committer.AddBusinessObject(car1);
committer.AddBusinessObject(car2);
committer.AddBusinessObject(engine1);
committer.AddBusinessObject(engine2);
committer.CommitTransaction();
//---------------Assert PreConditions---------------
//---------------Execute Test ----------------------
PropertyComparer<Engine, string> comparer = new PropertyComparer<Engine, string>("CarRegNo");
comparer.Source = new Source("Car");
int comparisonResult = comparer.Compare(engine1, engine2);
//---------------Test Result -----------------------
Assert.Greater(comparisonResult, 0, "engine1 should be greater as its car's regno is greater");
//---------------Tear Down -------------------------
}
public void TestSimpleCompare_String()
{
//---------------Set up test pack-------------------
Car car1 = new Car();
car1.CarRegNo = "5";
Car car2 = new Car();
car2.CarRegNo = "2";
//---------------Execute Test ----------------------
PropertyComparer<Car, string> comparer = new PropertyComparer<Car, string>("CarRegNo");
int comparisonResult = comparer.Compare(car1, car2);
//---------------Test Result -----------------------
Assert.Greater(comparisonResult, 0, "car1 should be greater than car2 when compared on CarRegNo");
//---------------Tear Down -------------------------
}
public void TestSimpleCompare_String()
{
//---------------Set up test pack-------------------
Car car1 = new Car();
car1.CarRegNo = "5";
Car car2 = new Car();
car2.CarRegNo = "2";
//---------------Execute Test ----------------------
PropertyComparer <Car, string> comparer = new PropertyComparer <Car, string>("CarRegNo");
int comparisonResult = comparer.Compare(car1, car2);
//---------------Test Result -----------------------
Assert.Greater(comparisonResult, 0, "car1 should be greater than car2 when compared on CarRegNo");
//---------------Tear Down -------------------------
}
public void TestCompareThroughRelationship()
{
//---------------Set up test pack-------------------
Car car1 = new Car();
car1.CarRegNo = "5";
Car car2 = new Car();
car2.CarRegNo = "2";
Engine engine1 = new Engine();
engine1.CarID = car1.CarID;
engine1.EngineNo = "20";
Engine engine2 = new Engine();
engine2.CarID = car2.CarID;
engine2.EngineNo = "50";
ITransactionCommitter committer = BORegistry.DataAccessor.CreateTransactionCommitter();
committer.AddBusinessObject(car1);
committer.AddBusinessObject(car2);
committer.AddBusinessObject(engine1);
committer.AddBusinessObject(engine2);
committer.CommitTransaction();
//---------------Assert PreConditions---------------
//---------------Execute Test ----------------------
PropertyComparer <Engine, string> comparer = new PropertyComparer <Engine, string>("CarRegNo");
comparer.Source = new Source("Car");
int comparisonResult = comparer.Compare(engine1, engine2);
//---------------Test Result -----------------------
Assert.Greater(comparisonResult, 0, "engine1 should be greater as its car's regno is greater");
//---------------Tear Down -------------------------
}
// this returns an array list of the propertydescriptor arrays, one for each
// component
//
private static ArrayList GetCommonProperties(object[] objs, bool presort, PropertyTab tab, GridEntry parentEntry)
{
PropertyDescriptorCollection[] propCollections = new PropertyDescriptorCollection[objs.Length];
Attribute[] attrs = new Attribute[parentEntry.BrowsableAttributes.Count];
parentEntry.BrowsableAttributes.CopyTo(attrs, 0);
for (int i = 0; i < objs.Length; i++)
{
PropertyDescriptorCollection pdc = tab.GetProperties(parentEntry, objs[i], attrs);
if (presort)
{
pdc = pdc.Sort(PropertyComparer);
}
propCollections[i] = pdc;
}
ArrayList mergedList = new ArrayList();
PropertyDescriptor[] matchArray = new PropertyDescriptor[objs.Length];
//
// Merge the property descriptors
//
int[] posArray = new int[propCollections.Length];
for (int i = 0; i < propCollections[0].Count; i++)
{
PropertyDescriptor pivotDesc = propCollections[0][i];
bool match = pivotDesc.Attributes[typeof(MergablePropertyAttribute)].IsDefaultAttribute();
for (int j = 1; match && j < propCollections.Length; j++)
{
if (posArray[j] >= propCollections[j].Count)
{
match = false;
break;
}
// check to see if we're on a match
//
PropertyDescriptor jProp = propCollections[j][posArray[j]];
if (pivotDesc.Equals(jProp))
{
posArray[j] += 1;
if (!jProp.Attributes[typeof(MergablePropertyAttribute)].IsDefaultAttribute())
{
match = false;
break;
}
matchArray[j] = jProp;
continue;
}
int jPos = posArray[j];
jProp = propCollections[j][jPos];
match = false;
// if we aren't on a match, check all the items until we're past
// where the matching item would be
while (PropertyComparer.Compare(jProp, pivotDesc) <= 0)
{
// got a match!
if (pivotDesc.Equals(jProp))
{
if (!jProp.Attributes[typeof(MergablePropertyAttribute)].IsDefaultAttribute())
{
match = false;
jPos++;
}
else
{
match = true;
matchArray[j] = jProp;
posArray[j] = jPos + 1;
}
break;
}
// try again
jPos++;
if (jPos < propCollections[j].Count)
{
jProp = propCollections[j][jPos];
}
else
{
break;
}
}
// if we got here, there is no match, quit for this guy
if (!match)
{
posArray[j] = jPos;
break;
}
}
// do we have a match?
if (match)
{
matchArray[0] = pivotDesc;
mergedList.Add(matchArray.Clone());
}
}
return(mergedList);
}
public int CompareTo(PatternUst other)
{
return(propertyComparer.Compare(this, other));
}
