private static IDictionaryDifference <TKey, TVal> GetDifference <TKey, TVal>(
IDictionaryAccessor <TKey, TVal> left,
IDictionaryAccessor <TKey, TVal> right)
{
IDictionary <TKey, TVal> entriesOnlyOnLeft = new Dictionary <TKey, TVal>();
IDictionary <TKey, TVal> entriesOnlyOnRight = new Dictionary <TKey, TVal>();
var entriesInCommon = new Dictionary <TKey, TVal>();
var entriesDiffering = new Dictionary <TKey, IDictionaryValueDifference <TVal> >();
int leftSize = left.Count;
int rightSize = right.Count;
if (leftSize != 0 && rightSize != 0)
{
foreach (KeyValuePair <TKey, TVal> leftKeyVal in left)
{
TKey key = leftKeyVal.Key;
TVal leftVal = leftKeyVal.Value;
if (right.TryGetValue(key, out TVal rightVal))
{
if (Equals(leftVal, rightVal))
{
entriesInCommon[key] = leftVal;
}
else
{
entriesDiffering[key] = new DictionaryValueDifference <TVal>(leftVal, rightVal);
}
}
else
{
entriesOnlyOnLeft[key] = leftVal;
}
}
foreach (KeyValuePair <TKey, TVal> rightKeyVal in right)
{
TKey key = rightKeyVal.Key;
if (!entriesOnlyOnLeft.ContainsKey(key) && !entriesInCommon.ContainsKey(key) &&
!entriesDiffering.ContainsKey(key))
{
entriesOnlyOnRight[key] = rightKeyVal.Value;
}
}
}
else if (leftSize != 0)
{
entriesOnlyOnLeft = left.ToDictionary();
}
else if (rightSize != 0)
{
entriesOnlyOnRight = right.ToDictionary();
}
return(new DictionaryDifference <TKey, TVal>(entriesOnlyOnLeft, entriesOnlyOnRight, entriesInCommon,
entriesDiffering));
}
