And the ministry of communications development in the name of muhammad al khorezmi tashkent university of information technologies

We should know that we need PasswordData and PasswordValidator objects to start validating passwords. We've already discussed PasswordData. Let's create PasswordValidator now.
Firstly, we should define a set of rules for password validation. We have to pass them to constructor while creating a PasswordValidator object:

PasswordValidator passwordValidator = new PasswordValidator(new LengthRule(5));

There are two ways of passing our password to a PasswordData object. We pass it to either the constructor or the setter method:

PasswordData passwordData = new PasswordData("1234");


PasswordData passwordData2 = new PasswordData();
passwordData.setPassword("1234");

We can validate our password by calling validate() method on PasswordValidator:

RuleResult validate = passwordValidator.validate(passwordData);
As a result, we'll get a RuleResult object.

3.3. Rule Result

RuleResult holds interesting information about a validation process. It comes as a result of the validate() method.
First of all, it can tell us whether the password is valid:
Assert.assertEquals(false, validate.isValid());


Moreover, we can learn what errors are returned when the password is invalid. Error codes and validation descriptions are kept in RuleResultDetail:

RuleResultDetail ruleResultDetail = validate.getDetails().get(0);
Assert.assertEquals("TOO_SHORT", ruleResultDetail.getErrorCode());
Assert.assertEquals(5, ruleResultDetail.getParameters().get("minimumLength"));
Assert.assertEquals(5, ruleResultDetail.getParameters().get("maximumLength"));

Finally, we can explore the password validation's metadata with RuleResultMetadata:

Integer lengthCount = validate
.getMetadata()
.getCounts()
.get(RuleResultMetadata.CountCategory.Length);
Assert.assertEquals(Integer.valueOf(4), lengthCount);