/// <summary>
/// Merges a list.
/// </summary>
/// <typeparam name="TKey">Type of key.</typeparam>
/// <typeparam name="TSource">State type.</typeparam>
/// <typeparam name="TTarget">Target type.</typeparam>
/// <param name="source">Redux state type.</param>
/// <param name="target">Target type linked to <paramref name="source"/>.</param>
/// <param name="creator">Creator function that creates new instances of target types.</param>
/// <returns>Merge result.</returns>
public static MergeResult MergeList <TKey, TSource, TTarget>(IEnumerable <TSource> source, IList <TTarget> target, Func <TSource, TTarget> creator)
where TSource : IKeyedItem <TKey>
where TTarget : IBoundViewModel <TSource>
{
MergeResult result = new MergeResult();
List <TSource> current = new List <TSource>(source);
for (int i = target.Count - 1; i >= 0; i--)
{
TKey targetKey = target[i].State.Key;
var findResult = Find(targetKey, source);
if (!findResult.Found)
{
target.RemoveAt(i);
result.Removed++;
}
else
{
current.Remove(findResult.Match);
if (!ReferenceEquals(findResult.Match, target[i].State))
{
target[i].Update(findResult.Match);
result.Updated++;
}
}
}
foreach (TSource item in current)
{
target.Add(creator(item));
result.Added++;
}
return(result);
}
/// <summary>
/// Merges a dictionary.
/// </summary>
/// <typeparam name="TKey">Type of key.</typeparam>
/// <typeparam name="TValue">Type of dictionary value.</typeparam>
/// <typeparam name="TTargetValue">Type of target value.</typeparam>
/// <param name="source">Redux state type.</param>
/// <param name="target">Target type linked to <paramref name="source"/>.</param>
/// <param name="creator">Creator function that creates new instances of target types.</param>
/// <returns>Merge result.</returns>
public static MergeResult MergeDictionary <TKey, TValue, TTargetValue>(
IDictionary <TKey, TValue> source,
IList <KeyValuePair <TKey, TTargetValue> > target,
Func <TValue, TTargetValue> creator)
where TTargetValue : IBoundViewModel <TValue>
{
MergeResult result = new MergeResult();
var current = new Dictionary <TKey, TValue>(source);
for (int i = target.Count - 1; i >= 0; i--)
{
TKey targetKey = target[i].Key;
if (!source.TryGetValue(targetKey, out var match))
{
target.RemoveAt(i);
result.Removed++;
}
else
{
current.Remove(targetKey);
if (!ReferenceEquals(match, target[i].Value.State))
{
target[i].Value.Update(match);
result.Updated++;
}
}
}
foreach (var pair in current)
{
var value = creator(pair.Value);
target.Add(new KeyValuePair <TKey, TTargetValue>(pair.Key, value));
result.Added++;
}
return(result);
}
