edu.vt.middleware.password
Class AlphabeticalSequenceRule

java.lang.Object
  edu.vt.middleware.password.AbstractSequenceRule
      edu.vt.middleware.password.AlphabeticalSequenceRule

All Implemented Interfaces:

Rule

public class AlphabeticalSequenceRule
extends AbstractSequenceRule

AlphabeticalSequenceRule contains methods for determining if a password contains an alphabetical keyboard sequence. Both uppercase and lowercase sequences are checked. The default sequence length is 5 characters.

• Sequences are of the form: 'stuvw' or 'KLMNO'
• If wrap=true: 'yzabc' will match

Version:

$Revision: 1841 $ $Date: 2011-02-25 14:05:47 -0500 (Fri, 25 Feb 2011) $

Author:

Middleware Services

Field Summary

Fields inherited from class edu.vt.middleware.password.AbstractSequenceRule

DEFAULT_SEQUENCE_LENGTH, MINIMUM_SEQUENCE_LENGTH, sequenceLength, wrapSequence

Constructor Summary

AlphabeticalSequenceRule()
This creates a new AlphabeticalSequenceRule with the default sequence length.

AlphabeticalSequenceRule(int sl, boolean wrap)
This will create a new AlphabeticalSequenceRule with the supplied sequence length and wrap settings.

Method Summary

protected char[][]	getSequence(int n) Get the sequence of character pairs for which to search.
protected int	getSequenceCount() Get the number of character sequences used in this implementation.

Methods inherited from class edu.vt.middleware.password.AbstractSequenceRule

setSequenceLength, toString, validate

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Constructor Detail

AlphabeticalSequenceRule

public AlphabeticalSequenceRule()

This creates a new AlphabeticalSequenceRule with the default sequence length.

AlphabeticalSequenceRule

public AlphabeticalSequenceRule(int sl,
                                boolean wrap)

This will create a new AlphabeticalSequenceRule with the supplied sequence length and wrap settings.

Parameters:

sl - int sequence length

wrap - boolean whether to wrap search sequences

Method Detail

getSequence

protected char[][] getSequence(int n)

Get the sequence of character pairs for which to search.

Specified by:

getSequence in class AbstractSequenceRule

Parameters:

n - int provides support for multiple character sequences that are indexed from 0 to n.

Returns:

char[][] character sequence.

getSequenceCount

protected int getSequenceCount()

Get the number of character sequences used in this implementation.

Specified by:

getSequenceCount in class AbstractSequenceRule

Returns:

int number of character sequences.