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

Rule 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: 1927 $ $Date: 2011-04-27 13:32:24 -0400 (Wed, 27 Apr 2011) $

Author:

Middleware Services

Field Summary

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

DEFAULT_SEQUENCE_LENGTH, ERROR_CODE, MINIMUM_SEQUENCE_LENGTH, sequenceLength, wrapSequence

Constructor Summary

AlphabeticalSequenceRule()
Default constructor.

AlphabeticalSequenceRule(int sl, boolean wrap)
Creates a new alphabetical sequence rule.

Method Summary

protected char[][]	getSequence(int n) Returns the sequence of character pairs for which to search.
protected int	getSequenceCount() Returns 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()

Default constructor.

AlphabeticalSequenceRule

public AlphabeticalSequenceRule(int sl,
                                boolean wrap)

Creates a new alphabetical sequence rule.

Parameters:

sl - sequence length

wrap - whether to wrap search sequences

Method Detail

getSequence

protected char[][] getSequence(int n)

Returns the sequence of character pairs for which to search.

Specified by:

getSequence in class AbstractSequenceRule

Parameters:

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

Returns:

character sequence.

getSequenceCount

protected int getSequenceCount()

Returns the number of character sequences used in this implementation.

Specified by:

getSequenceCount in class AbstractSequenceRule

Returns:

number of character sequences.