/// <summary>
/// Removes a given key and associated value from a map.
/// </summary>
/// <returns>true if the key was in the map and was removed otherwise false</returns>
/// <exception cref="System.ArgumentNullException">If the key is null</exception>
/// <exception cref="System.ArgumentException">If the key is an empty string</exception>
public bool RemoveElement(string key)
{
try
{
Node <TValue> data = new Node <TValue>(DefaultValue);
int hashCode = key.GetHashCode();
HashNodeMap <TValue> current = hashNode;
bool flag = false;
while (current != null && current.next != null)
{
if (current.key == hashCode)
{
if (current.next != null)
{
current = current.next;
Count--;
}
else
{
current = null;
}
}
if (current.next != null && flag == false)
{
current = current.next;
}
}
return(true);
}
catch
{
return(false);
}
}
/// <summary>
/// Adds a given key and value to a map.
/// If the given key already exists in a map, then the value associated with this key should be overriden.
/// </summary>
/// <returns>true if the value for the key was overriden otherwise false</returns>
/// <exception cref="System.ArgumentNullException">If the key is null</exception>
/// <exception cref="System.ArgumentException">If the key is an empty string</exception>
/// <exception cref="System.ArgumentNullException">If the value is null</exception>
public bool AddElement(string key, TValue value)
{
try
{
HashNodeMap <TValue> current = null;
if (hashNode == null)
{
hashNode = CreateNode(key, value);
}
else
{
current = hashNode;
while (current.next != null)
{
current = current.next;
}
current.next = CreateNode(key, value);
}
Count++;
return(true);
}
catch
{
return(false);
}
}
private HashNodeMap <TValue> CreateNode(string key, TValue data)
{
int hashCode = key.GetHashCode();
HashNodeMap <TValue> newNodeMap = new HashNodeMap <TValue>();
newNodeMap.data = new Node <TValue>(data);
newNodeMap.key = hashCode;
return(newNodeMap);
}
/// <summary>
/// Returns the value associated with a given key.
/// </summary>
/// <returns>The value associated with a given key or <c>DefaultValue</c> if the key does not exist in a map</returns>
/// <exception cref="System.ArgumentNullException">If a key is null</exception>
/// <exception cref="System.ArgumentException">If a key is an empty string</exception>
public TValue GetValue(string key)
{
Node <TValue> data = new Node <TValue>(DefaultValue);
int hashCode = key.GetHashCode();
HashNodeMap <TValue> current = hashNode;
while (current != null)
{
if (current.key == hashCode)
{
data = current.data;
break;
}
if (current.next != null)
{
current = current.next;
}
}
return(data.data);
}
