public MutableLookup(IEqualityComparer <TKey> comparer)
{
if (comparer == null)
{
throw new ArgumentNullException("comparer");
}
groupings = new Dictionary <TKey, MutableLookupGrouping>(comparer);
if (!typeof(TKey).IsValueType)
{
nullGrouping = new MutableLookupGrouping(default(TKey));
}
}
/// <summary>
/// Adds <paramref name="element"/> under the specified <paramref name="key"/>. <paramref name="key"/> does not need to exist.
/// </summary>
/// <param name="key">The key to add <paramref name="element"/> under.</param>
/// <param name="element">The element to add.</param>
public void Add(TKey key, TElement element)
{
MutableLookupGrouping grouping;
if (key == null)
{
grouping = nullGrouping;
}
else if (!this.groupings.TryGetValue(key, out grouping))
{
grouping = new MutableLookupGrouping(key);
this.groupings.Add(key, grouping);
}
grouping.Add(element);
}
public void Add(TKey key, IEnumerable <TElement> elements)
{
if (elements == null)
{
throw new ArgumentNullException("elements");
}
MutableLookupGrouping grouping;
if (key == null)
{
grouping = nullGrouping;
}
else if (!this.groupings.TryGetValue(key, out grouping))
{
grouping = new MutableLookupGrouping(key);
this.groupings.Add(key, grouping);
}
grouping.AddRange(elements);
}
public MutableLookup(ILookup <TKey, TElement> lookup)
{
if (lookup == null)
{
throw new ArgumentNullException("lookup");
}
groupings = new Dictionary <TKey, MutableLookupGrouping>(lookup.Count);
if (!typeof(TKey).IsValueType)
{
nullGrouping = new MutableLookupGrouping(default(TKey), lookup[default(TKey)]);
}
foreach (var grouping in lookup)
{
if (grouping.Key == null)
{
continue;
}
groupings.Add(grouping.Key, new MutableLookupGrouping(grouping.Key, grouping));
}
}
