/// <summary>
/// Removes the specified data from the counting bloom filter.
/// </summary>
/// <param name="data">The data to remove from this counting bloom filter.</param>
/// <exception cref="System.ArgumentNullException">
/// Thrown if data is null.
/// </exception>
/// <exception cref="System.ArgumentException">
/// Thrownf if data is empty.
/// </exception>
public void Remove(byte[] data)
{
#region Input validation
Insist.IsNotNull(data, "data");
Insist.IsNotEmpty(data, "data");
#endregion
int[] computedIndeces = GetIndeces(data);
_lock.EnterWriteLock();
try
{
foreach (int index in computedIndeces)
{
if (_bucketStorage[index] > 0)
{
_bucketStorage[index]--;
}
}
}
finally
{
_lock.ExitWriteLock();
}
}
/// <summary>
/// Checks to see if the supplied data has been added to this filter.
/// </summary>
/// <param name="data">
/// The data to check for presence in the filter.
/// </param>
/// <returns>
/// True if the item *might* have been added to the filter. False if it
/// definitely has not.
/// </returns>
/// <exception cref="System.ArgumentNullException">
/// Thrown if data is null.
/// </exception>
/// <exception cref="System.ArgumentException">
/// Thrownf if data is empty.
/// </exception>
public bool IsPresent(byte[] data)
{
#region Input validation
Insist.IsNotNull(data, "data");
Insist.IsNotEmpty(data, "data");
#endregion
int[] computedIndeces = GetIndeces(data);
_lock.EnterReadLock();
try
{
foreach (int index in computedIndeces)
{
if (IsBucketInUse(index) == false)
{
return(false);
}
}
}
finally
{
_lock.ExitReadLock();
}
return(true);
}
public void IsNotEmpty_2_Null_Or_Empty_User_Message_Uses_Default_Message(string userMessage)
{
string message = null;
try {
Insist.IsNotEmpty(new string[0], ARGUMENT_NAME, userMessage);
} catch (ArgumentException e) {
message = e.Message;
}
Assert.IsNotNullOrEmpty(message);
}
/// <summary>
/// Generates a new one time password from the supplied data.
/// </summary>
/// <param name="secretKey">The secret key to use in the HMAC</param>
/// <param name="hmac">The hmac algorithm to use</param>
/// <param name="dt">The date and time to generate a code for</param>
/// <param name="offset">Any offsets that should be applied to the supplie date time</param>
/// <param name="timeStep">The timestep value to use to calculate the current step</param>
/// <param name="otpLength">The required legnth of the returned passcode</param>
/// <returns>A one time password code</returns>
/// <exception cref="System.ArgumentNullException">Thrown if hmac or secret key is null</exception>
/// <exception cref="System.ArgumentException">Thrown if secret key is empty, optLength is
/// not defined value or timeStep is less than 1 second.</exception>
public static string Generate(byte[] secretKey, HMAC hmac, DateTime dt, TimeSpan offset, TimeSpan timeStep, OneTimePasswordLength otpLength)
{
#region Input validation
Insist.IsNotNull(hmac, "hmac");
Insist.IsNotNull(secretKey, "secretKey");
Insist.IsNotEmpty(secretKey, "secretKey");
Insist.IsDefined <OneTimePasswordLength>(otpLength, "optLength");
Insist.IsAtLeast(timeStep.TotalSeconds, 1, "timeStep");
#endregion
dt = dt + offset;
ulong stepNumber = (ulong)Math.Floor((double)dt.ToUnixTime() / (double)timeStep.TotalSeconds);
return(HmacOneTimePassword.Generate(secretKey, stepNumber, hmac, otpLength));
}
/// <summary>
/// Adds the specified data to the bloom filter.
/// </summary>
/// <param name="data">The data to track in this bloom filter.</param>
/// <exception cref="System.ArgumentNullException">
/// Thrown if data is null.
/// </exception>
/// <exception cref="System.ArgumentException">
/// Thrownf if data is empty.
/// </exception>
public void Add(byte[] data)
{
#region Input validation
Insist.IsNotNull(data, "data");
Insist.IsNotEmpty(data, "data");
#endregion
int[] computedIndeces = GetIndeces(data);
_lock.EnterWriteLock();
try
{
bool itemAlreadyPresent = true;
foreach (int index in computedIndeces)
{
if (IsBucketInUse(index) == false)
{
itemAlreadyPresent = false;
break;
}
}
if (itemAlreadyPresent == false)
{
foreach (int index in computedIndeces)
{
SetBucketAsInUse(index);
}
}
}
finally
{
_lock.ExitWriteLock();
}
}
public void IsNotEmpty_2_Non_Empty_Collection_Does_Not_Throw_Exception()
{
Assert.DoesNotThrow(() => { Insist.IsNotEmpty(new string[] { "Hello, World" }, ARGUMENT_NAME, MESSAGE); });
}
public void IsNotEmpty_2_Empty_Collection_Throws_Exception()
{
Insist.IsNotEmpty(new string[0], ARGUMENT_NAME, MESSAGE);
}
public void IsNotEmpty_2_Null_Or_Empty_Argument_Name_Throws_Exception(string argName)
{
Insist.IsNotEmpty(new string[] { "Hello, World" }, argName, MESSAGE);
}
