/// <summary>
/// Constructs a hash table with the specified capacity
/// </summary>
/// <param name="initialCapacity"></param>
public HashTable(int initialCapacity)
{
if (initialCapacity < 1)
{
throw new ArgumentOutOfRangeException("initialCapacity");
}
_array = new HashTableArray <TKey, TValue>(initialCapacity);
// when the count exceeds this value, the next add will cause the array to grow
_maxItemsAtCurrentSize = (int)(initialCapacity * _fillFactor) + 1;
}
/// <summary>
/// Adds the key/value pair to the hash table. If the key already exists in the
/// hash table an ArgumentException will be thrown
/// </summary>
/// <param name="key"></param>
/// <param name="value"></param>
public void Add(TKey key, TValue value)
{
if (_count >= _maxItemsAtCurrentSize)
{
// allocate more space
HashTableArray <TKey, TValue> largerArray = new HashTableArray <TKey, TValue>(_array.Capacity * 2);
// and re-add each item to the new array
foreach (HashTableNodePair <TKey, TValue> node in _array.Items)
{
largerArray.Add(node.Key, node.Value);
}
// the larger array is now the hash table storage
_array = largerArray;
// update the new max items cached value
_maxItemsAtCurrentSize = (int)(_array.Capacity * _fillFactor) + 1;
}
_array.Add(key, value);
_count += 1;
}