com.ibm.passwordrules.standard
Class MinDistinctCharacters

java.lang.Object
  |
  +--com.ibm.passwordrules.LexicalRule
        |
        +--com.ibm.passwordrules.standard.MinDistinctCharacters

All Implemented Interfaces:

java.lang.Cloneable, Rule, java.io.Serializable

public class MinDistinctCharacters

extends LexicalRule

This class implements built-in rule for restricting the minimum number of unique characters.

See Also:

Serialized Form

Field Summary

static java.lang.String

INSUFFICIENT_UNIQUE_CHARS Constant representing a message key in a property file

Fields inherited from class com.ibm.passwordrules.LexicalRule

DEFAULT_MAX_SEQUENTIAL_CHARACTERS, LOWER_CASE_ONLY, UPPER_CASE_ONLY

Constructor Summary

MinDistinctCharacters(int min)
Constructor accepting int parameter representing the minimum number of distinct characters.

Method Summary

void	constrain(PasswordGenerator generator) Constrain the password generator to allowed values.
int	getMin() Return the minimum number of distinct characters.
boolean	join(Rule rule) Try to join the specified rule with this one.
boolean	validate(java.lang.String password, ValidationInfo validationInfo) Validate the given password using the given validation info.

Methods inherited from class com.ibm.passwordrules.LexicalRule

getParameter, setParameter, validateSafe

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

INSUFFICIENT_UNIQUE_CHARS

public static final java.lang.String INSUFFICIENT_UNIQUE_CHARS

Constant representing a message key in a property file

See Also:

Constant Field Values

Constructor Detail

MinDistinctCharacters

public MinDistinctCharacters(int min)

Constructor accepting int parameter representing the minimum number of distinct characters.

Parameters:

min - int value representing the minimum number of distinct characters.

Method Detail

getMin

public int getMin()

Return the minimum number of distinct characters.

Returns:

int value representing the minimum number of distinct characters.

constrain

public void constrain(PasswordGenerator generator)

Constrain the password generator to allowed values.

Specified by:

constrain in interface Rule

Overrides:

constrain in class LexicalRule

Parameters:

generator - including a character template to constrain. This method has an empty implementation. The cosntraining in the case of this rule will be done via the LenthConstraint method if length constraining rule is used.

validate

public boolean validate(java.lang.String password,
                        ValidationInfo validationInfo)
                 throws InvalidPasswordException

Validate the given password using the given validation info.

Parameters:

validationInfo - contains contextual information about the password being validated.

password - Password to validate.

Returns:

always return true

Throws:

InvalidPasswordException - thrown when password is invalid.

join

public boolean join(Rule rule)
             throws IncompatibleRulesException

Try to join the specified rule with this one. The more restrictive rule takes precedence.

Parameters:

rule - The rule to be joined with this one.

Returns:

True if the rule was successfully joined.

Throws:

IncompatibleRulesException - Thrown when given rule cannot be joined because it is not compatible.