/// <summary>
/// CONSTRUCTOR
/// </summary>
///
public OpenAddressingHashTable(int size)
{
_size = size;
_loadFactor = 0.40;
_inTable = 0;
_table = new OAHashEntry <TKey, TValue> [_size];
_keys = new List <TKey>();
_values = new List <TValue>();
//initialize all values to -1
for (int i = 0; i < _table.Length; i++)
{
//initialize each slot
_table[i] = new OAHashEntry <TKey, TValue>(default(TKey), default(TValue), false);
}
}
public void Add(TKey key, TValue value)
{
int i = 0;
//makes sure there are no duplicate keys
if (ContainsKey(key))
{
return;
}
do
{
//calculate index
int index = _double_hash(key, i);
if (_table[index].occupied == false)
{
var newEntry = new OAHashEntry <TKey, TValue>(key, value, true);
_keys.Add(key);
_values.Add(value);
//set value and key
_table[index] = newEntry;
//increment how many items are in the table
_inTable++;
break;
}
else
{
i++;
}
} while (i != _size);
//every slot is in the table is occupied
if (_inTable == _size)
{
//expand and rehash
_expand();
}
}
//rehashes table
private void _rehash()
{
//will hold contents of _table to copy over
OAHashEntry <TKey, TValue>[] temp = new OAHashEntry <TKey, TValue> [_size];
temp = _table;
OAHashEntry <TKey, TValue>[] rehash = new OAHashEntry <TKey, TValue> [_size];
for (int i = 0; i < rehash.Length; i++)
{
//initialize each slot
rehash[i] = new OAHashEntry <TKey, TValue>(default(TKey), default(TValue), false);
}
_inTable = 0;
_table = rehash;
//rehash over the newly sized table
for (int i = 0; i < temp.Length; i++)
{
//this should rehash since the size is now doubled so the hashing will be different
//inserts the key into _table
Add(temp[i].key, temp[i].value);
}
}