/// <summary>
/// This method is will compare two objects and returns the Change Data Capture List as result
/// </summary>
/// <param name="oldEntry">data model object which contains previous state of data (Could be the DAL object)</param>
/// <param name="newEntry">data model object which contains new state of data (Could be BLL object)</param>
/// <param name="dateChanged">Data time of change</param>
/// <param name="fieldList">Optional fieldList to compare, also fields with CDCFieldAttribute annotation in will be compare</param>
/// <param name="keyField">Optional key field name, also field with CDCPrimaryKeyAttribute annotation will be used as key field</param>
/// <param name="parentName">Optional Name of parent or owner class</param>
/// <param name="mainKey">Optional Key field value of parents or owner objects</param>
/// <param name="classTitle">Optional preferted title for current object, also class annotation CDCClassTitleAttribute will be used to determain class title</param>
/// <returns></returns>
public ChangeDataCaptureList GetChanges(object oldEntry, object newEntry, DateTime dateChanged,
Dictionary <String, String> fieldList = null, List <string> keyFields = null, string parentName = "", string mainKey = "", string classTitle = "")
{
ChangeDataCaptureList CDCs = new ChangeDataCaptureList();
//there is nothing to compare
if ((oldEntry == null) && (newEntry == null))
{
return(CDCs);
}
//new assigment happend and all properties of newEntry should be captured
if (oldEntry == null)
{
CaptureNewAssignment(newEntry, CDCs, fieldList, keyFields, parentName, mainKey, classTitle, dateChanged);
return(CDCs);
}
//deletion happend and all properties of oldEntry should be captured
if (newEntry == null)
{
CaptureNewDeletion(oldEntry, CDCs, fieldList, keyFields, parentName, mainKey, classTitle, dateChanged);
return(CDCs);
}
if (IsCollection(oldEntry) || IsCollection(oldEntry))
{
CDCforCollection((System.Collections.ICollection)oldEntry, (System.Collections.ICollection)newEntry, CDCs,
fieldList, keyFields, "", parentName, mainKey, classTitle, dateChanged);
return(CDCs);
}
var oldType = oldEntry.GetType();
var newType = newEntry.GetType();
//if(oldType != newType)
//{
// return CDCs; //Types don't match, cannot capture changes
//}
//DAL
var oldProperties = oldType.GetProperties();
//var newProperties = newType.GetProperties();
//BLL
var newProperties = newType.GetProperties().Where(pr => pr.GetCustomAttributes(typeof(CDCFieldAttribute), false).Any() ||
((fieldList != null) && fieldList.ContainsKey(pr.Name)));
//extract key value
//var key = newType.GetProperties().Where(x => Attribute.IsDefined(x, typeof(CDCPrimaryKeyAttribute)) || (x.Name == keyField)).FirstOrDefault()?.GetValue(newEntry)?.ToString();
var key = GetKeyFieldsValue(newEntry, keyFields);
var primaryKey = (string.IsNullOrWhiteSpace(mainKey) ? string.Empty : mainKey) +
(string.IsNullOrWhiteSpace(mainKey) || string.IsNullOrWhiteSpace(key) ? string.Empty : ",") +
(string.IsNullOrWhiteSpace(key) ? string.Empty : key);
//var className = (string.IsNullOrWhiteSpace(parentName) ? string.Empty : parentName + ".") + oldEntry.GetType().Name;
string _classTitle = string.IsNullOrWhiteSpace(classTitle) ?
(newEntry.GetType().GetCustomAttribute(typeof(CDCClassTitleAttribute)) as CDCClassTitleAttribute)?.Title :
classTitle;
var className = string.IsNullOrWhiteSpace(parentName) ? (string.IsNullOrWhiteSpace(_classTitle) ? newEntry.GetType().Name : _classTitle) : parentName;
//loop all old properties (DAL object)
foreach (var oldProperty in oldProperties)
{
//find maching property from newEntry (BLL object)
var matchingProperty =
newProperties.Where(x => ((Attribute.IsDefined(x, typeof(CDCFieldAttribute)) &&
(x.GetCustomAttributes(typeof(CDCFieldAttribute), false)[0]
as CDCFieldAttribute).FieldName == oldProperty.Name) ||
((fieldList != null) && fieldList.ContainsKey(oldProperty.Name))
))
//&& x.PropertyType == oldProperty.PropertyType)
.FirstOrDefault();
//no match find so continue
if (matchingProperty == null)
{
continue;
}
//if (matchingProperty.PropertyType.IsGenericType)
//{
// continue;
//}
//if (typeof(System.Collections.IEnumerable).IsAssignableFrom(matchingProperty.PropertyType))
//{
// // ...
//}
//if the property is Collection
if (IsCollection(matchingProperty))
{
CDCforCollection((System.Collections.ICollection)oldProperty.GetValue(oldEntry, null), (System.Collections.ICollection)matchingProperty.GetValue(newEntry, null),
CDCs, fieldList, keyFields, oldProperty.Name, className, primaryKey, classTitle, dateChanged);
continue;
}
//if the property is a complex object so go for recursive process
if ((!IsEnum(matchingProperty.PropertyType)) &&
(!IsSimple(matchingProperty.PropertyType)))
{
ChangeDataCaptureList nestedCDCs = GetChanges(oldProperty.GetValue(oldEntry), matchingProperty.GetValue(newEntry), dateChanged,
fieldList, keyFields, className + "." + matchingProperty.Name, primaryKey, "");
CDCs.AddRange(nestedCDCs);
continue;
}
//extract old and new values
string oldValue = string.Empty;
string newValue = string.Empty;
if (IsEnum(matchingProperty.PropertyType))
{
getEnumValues(oldEntry, newEntry, oldProperty, matchingProperty, out oldValue, out newValue);
}
else
{
oldValue = oldProperty.GetValue(oldEntry)?.ToString();
newValue = matchingProperty.GetValue(newEntry)?.ToString();
}
string mask = (matchingProperty.GetCustomAttribute(typeof(CDCMaskValueAttribute)) as CDCMaskValueAttribute)?.Mask;
string propName = Attribute.IsDefined(matchingProperty, typeof(CDCFieldAttribute)) ?
(matchingProperty.GetCustomAttribute(typeof(CDCFieldAttribute)) as CDCFieldAttribute)?.Title :
((fieldList != null) && fieldList.ContainsKey(matchingProperty.Name)) ? fieldList[matchingProperty.Name] : matchingProperty.Name;
//compare old and new values and capture as a new change if there is difference
if (oldValue != newValue)
{
CDCs.Add(new ChangeDataCapture(mask)
{
ChangeType = ChangeType.Update,
PrimaryKey = primaryKey,
DateChanged = dateChanged,
ClassName = className,
PropertyName = propName,
OldValue = oldValue,
NewValue = newValue,
OldEntry = oldEntry,
NewEntry = newEntry
});
}
}
return(CDCs);
}
private void CaptureAllPoperties(object entry, ChangeType changeType, ChangeDataCaptureList CDCs,
Dictionary <String, String> fieldList, List <string> keyFields, string parentName, string mainKey, string classTitle, DateTime dateChanged)
{
if (entry == null || CDCs == null)
{
return;
}
var _type = entry.GetType();
//var _properties = _type.GetProperties();
var _properties = _type.GetProperties().Where(pr => pr.GetCustomAttributes(typeof(CDCFieldAttribute), false).Any() ||
((fieldList != null) && fieldList.ContainsKey(pr.Name)));
//var dateChanged = DateTime.Now;
//var key = _type.GetProperties().Where(x => Attribute.IsDefined(x, typeof(CDCPrimaryKeyAttribute)) || (x.Name == keyField)).FirstOrDefault()?.GetValue(entry)?.ToString();
var key = GetKeyFieldsValue(entry, keyFields);
var primaryKey = (string.IsNullOrWhiteSpace(mainKey) ? string.Empty : mainKey) +
(string.IsNullOrWhiteSpace(mainKey) || string.IsNullOrWhiteSpace(key) ? string.Empty : ",") +
(string.IsNullOrWhiteSpace(key) ? string.Empty : key);
//var className = (string.IsNullOrWhiteSpace(parentName) ? string.Empty : parentName + ".") + entry.GetType().Name;
string _classTitle = string.IsNullOrWhiteSpace(classTitle) ? (entry.GetType().GetCustomAttribute(typeof(CDCClassTitleAttribute)) as CDCClassTitleAttribute)?.Title : classTitle;
var className = string.IsNullOrWhiteSpace(parentName) ? (string.IsNullOrWhiteSpace(_classTitle) ? entry.GetType().Name : _classTitle) : parentName;
//loop all properties
foreach (var _property in _properties)
{
string mask = (_property.GetCustomAttribute(typeof(CDCMaskValueAttribute)) as CDCMaskValueAttribute)?.Mask;
if (IsCollection(_property))
{
string pName = Attribute.IsDefined(_property, typeof(CDCFieldAttribute)) ?
(_property.GetCustomAttribute(typeof(CDCFieldAttribute)) as CDCFieldAttribute)?.Title :
((fieldList != null) && fieldList.ContainsKey(_property.Name)) ? fieldList[_property.Name] : _property.Name;
CaptureAllCollection((System.Collections.ICollection)_property.GetValue(entry, null), changeType, mask, CDCs, className, primaryKey, pName, dateChanged);
continue;
}
//if the property is a complex object so go for recursive process
if ((!IsEnum(_property.PropertyType)) &&
(!IsSimple(_property.PropertyType)))
{
CaptureAllPoperties(_property.GetValue(entry), changeType, CDCs, fieldList, keyFields, className, primaryKey, classTitle, dateChanged);
continue;
}
var oldV = string.Empty;
var newV = string.Empty;
object oldEntry = null;
object newEntry = null;
switch (changeType)
{
case ChangeType.Assign:
newEntry = entry;
newV = _property.GetValue(entry)?.ToString();
break;
case ChangeType.Remove:
oldV = _property.GetValue(entry)?.ToString();
oldEntry = entry;
break;
}
string propName = Attribute.IsDefined(_property, typeof(CDCFieldAttribute)) ?
(_property.GetCustomAttribute(typeof(CDCFieldAttribute)) as CDCFieldAttribute)?.Title :
((fieldList != null) && fieldList.ContainsKey(_property.Name)) ? fieldList[_property.Name] : _property.Name;
CDCs.Add(new ChangeDataCapture(mask)
{
ChangeType = changeType,
PrimaryKey = primaryKey,
DateChanged = dateChanged,
ClassName = className,
PropertyName = propName,
OldValue = oldV,
NewValue = newV,
OldEntry = oldEntry,
NewEntry = newEntry
});
}
}
private void CDCforSimpleTypeCollection(ICollection oldEntry, ICollection newEntry,
ChangeDataCaptureList CDCs, string parentName, string mainKey, string propertyName, DateTime dateChanged)
{
foreach (var itemO in oldEntry)
{
bool found = false;
foreach (var itemN in newEntry)
{
if ((itemO != null) && (itemN != null) && (itemO.ToString().Equals(itemN.ToString())))
{
found = true;
break;
}
}
if (!found)
{
string mask = (newEntry.GetType().GetCustomAttribute(typeof(CDCMaskValueAttribute)) as CDCMaskValueAttribute)?.Mask;
CDCs.Add(new ChangeDataCapture(mask)
{
ChangeType = ChangeType.Remove,
PrimaryKey = mainKey,
DateChanged = dateChanged,
ClassName = parentName,
PropertyName = propertyName,
OldValue = itemO?.ToString(),
NewValue = string.Empty,
OldEntry = oldEntry,
NewEntry = newEntry
});
}
}
foreach (var itemN in newEntry)
{
bool found = false;
foreach (var itemO in oldEntry)
{
if ((itemO != null) && (itemN != null) && (itemO.ToString().Equals(itemN.ToString())))
{
found = true;
break;
}
}
if (!found)
{
string mask = (newEntry.GetType().GetCustomAttribute(typeof(CDCMaskValueAttribute)) as CDCMaskValueAttribute)?.Mask;
CDCs.Add(new ChangeDataCapture(mask)
{
ChangeType = ChangeType.Assign,
PrimaryKey = mainKey,
DateChanged = dateChanged,
ClassName = parentName,
PropertyName = propertyName,
OldValue = string.Empty,
NewValue = itemN?.ToString(),
OldEntry = oldEntry,
NewEntry = newEntry
});
}
}
}
private void CaptureAllCollection(System.Collections.ICollection entry, ChangeType changeType, string mask,
ChangeDataCaptureList CDCs, string parentName, string mainKey, string propertyName, DateTime dateChanged)
{
bool?containsSimpleType = null;
//Test the item types of Enumerable oldEntry
foreach (var item in entry)
{
containsSimpleType = IsEnum(item.GetType()) || IsSimple(item.GetType());
break;
}
if (containsSimpleType == null)
{
return;
}
object oldEntry = null;
object newEntry = null;
switch (changeType)
{
case ChangeType.Assign:
newEntry = entry;
break;
case ChangeType.Remove:
oldEntry = entry;
break;
}
if (containsSimpleType == true)
{
foreach (var item in entry)
{
CDCs.Add(new ChangeDataCapture(mask)
{
ChangeType = changeType,
PrimaryKey = mainKey,
DateChanged = dateChanged,
ClassName = parentName,
PropertyName = propertyName,
OldValue = item?.ToString(),
NewValue = string.Empty,
OldEntry = oldEntry,
NewEntry = newEntry
});
}
}
else if (containsSimpleType == false)
{
foreach (var item in entry)
{
if (item == null)
{
continue;
}
object oldV = null;
object newV = null;
switch (changeType)
{
case ChangeType.Assign:
newV = item;
break;
case ChangeType.Remove:
oldV = item;
break;
}
ChangeDataCaptureList tempCDC = GetChanges(oldV, newV, dateChanged, null, null, parentName, mainKey);
if (tempCDC != null)
{
CDCs.AddRange(tempCDC);
}
}
}
}