User (Security Core Classes 6.2.5 API)

All Superinterfaces:

Principal

All Known Implementing Classes:

FileRealmUser
```
public interface User
extends Principal
```
All users are principals ... perhaps in the native OS, perhaps not.
Users always have authentication information, which is used to validate a user's proferred credentials. Different kinds of realms use different kinds of authentication information. For example, realms could use X.509 public key certificates, shared passphrases, encrypted passwords, smart cards, or biometric data to figure out if the user's credentials are valid.
Users typically have attributes that identify privileges granted/possesed by the user.

Author:

Harish Prabandham

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`Object`	`getAttribute(String name)`	Returns the single requested attribute for the user.
`Enumeration`	`getAttributeNames()`	Returns an enumeration of the keys for the attributes supported for this user.
`Realm`	`getRealm()`	Returns the realm with which this user is associated.

Methods inherited from interface java.security.Principal
equals, getName, hashCode, implies, toString

- Method Detail
  - getRealm
```
Realm getRealm()
        throws NoSuchRealmException
```
    Returns the realm with which this user is associated.
    
    Throws:
    
    NoSuchRealmException
  - getAttribute
```
Object getAttribute(String name)
```
    Returns the single requested attribute for the user.
    
    Parameters:
    
    name - string identifying the attribute.
    
    Returns:
    
    value of that attribute, or null if no value has been defined
  - getAttributeNames
```
Enumeration getAttributeNames()
```
    Returns an enumeration of the keys for the attributes supported for this user.