edu.vt.middleware.password
Class AbstractSequenceRule

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

All Implemented Interfaces:

Rule

Direct Known Subclasses:

AlphabeticalSequenceRule, NumericalSequenceRule, QwertySequenceRule

public abstract class AbstractSequenceRule
extends java.lang.Object
implements Rule

Provide common implementation for keyboard sequence rules.

Version:

$Revision: 1930 $ $Date: 2011-04-28 13:06:17 -0400 (Thu, 28 Apr 2011) $

Author:

Middleware Services

Field Summary

static int	DEFAULT_SEQUENCE_LENGTH Default length of keyboard sequence, value is 5.
static java.lang.String	ERROR_CODE Error code for sequence validation failures.
static int	MINIMUM_SEQUENCE_LENGTH Minimum length of keyboard sequence, value is 3.
protected int	sequenceLength Number of characters in sequence to match.
protected boolean	wrapSequence Whether or not to wrap a sequence when searching for matches.

Constructor Summary

AbstractSequenceRule()

Method Summary

protected abstract char[][]	getSequence(int n) Returns the sequence of character pairs for which to search.
protected abstract int	getSequenceCount() Returns the number of character sequences used in this implementation.
protected void	setSequenceLength(int sl) Sets the sequence length.
java.lang.String	toString() Returns a string representation of this object.
RuleResult	validate(PasswordData passwordData) Validates the supplied password data per the requirements of this rule.

Methods inherited from class java.lang.Object

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

Field Detail

ERROR_CODE

public static final java.lang.String ERROR_CODE

Error code for sequence validation failures.

See Also:

Constant Field Values

DEFAULT_SEQUENCE_LENGTH

public static final int DEFAULT_SEQUENCE_LENGTH

Default length of keyboard sequence, value is 5.

See Also:

Constant Field Values

MINIMUM_SEQUENCE_LENGTH

public static final int MINIMUM_SEQUENCE_LENGTH

Minimum length of keyboard sequence, value is 3.

See Also:

Constant Field Values

sequenceLength

protected int sequenceLength

Number of characters in sequence to match.

wrapSequence

protected boolean wrapSequence

Whether or not to wrap a sequence when searching for matches.

Constructor Detail

AbstractSequenceRule

public AbstractSequenceRule()

Method Detail

validate

public RuleResult validate(PasswordData passwordData)

Validates the supplied password data per the requirements of this rule.

Specified by:

validate in interface Rule

Parameters:

passwordData - to verify (not null).

Returns:

details on password verification

toString

public java.lang.String toString()

Returns a string representation of this object.

Overrides:

toString in class java.lang.Object

Returns:

string representation

setSequenceLength

protected void setSequenceLength(int sl)

Sets the sequence length.

Parameters:

sl - sequence length

getSequence

protected abstract char[][] getSequence(int n)

Returns the sequence of character pairs for which to search.

Parameters:

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

Returns:

character sequence.

getSequenceCount

protected abstract int getSequenceCount()

Returns the number of character sequences used in this implementation.

Returns:

number of character sequences.