javax.security.auth.kerberos

## Class KerberosPrincipal

- java.lang.Object
- - javax.security.auth.kerberos.KerberosPrincipal

All Implemented Interfaces:
  Serializable, Principal

    public final class KerberosPrincipal
    extends Object
    implements Principal, Serializable

This class encapsulates a Kerberos principal.

Since:
  1.4
See Also:
  Serialized Form

### Field Summary

Fields
`static int` `KRB_NT_PRINCIPAL` user principal name type.
`static int` `KRB_NT_SRV_HST` service with host name as instance (telnet, rcommands) name type.
`static int` `KRB_NT_SRV_INST` service and other unique instance (krbtgt) name type.
`static int` `KRB_NT_SRV_XHST` service with host as remaining components name type.
`static int` `KRB_NT_UID` unique ID name type.
`static int` `KRB_NT_UNKNOWN` unknown name type.

### Constructor Summary

Constructors
Constructor and Description
`KerberosPrincipal(String name)` Constructs a KerberosPrincipal from the provided string input.
`KerberosPrincipal(String name, int nameType)` Constructs a KerberosPrincipal from the provided string and name type input.

### Method Summary

Methods
`boolean` `equals(Object other)` Compares the specified Object with this Principal for equality.
`String` `getName()` The returned string corresponds to the single-string representation of a Kerberos Principal name as specified in Section 2.1 of RFC 1964.
`int` `getNameType()` Returns the name type of the KerberosPrincipal.
`String` `getRealm()` Returns the realm component of this Kerberos principal.
`int` `hashCode()` Returns a hashcode for this principal.
`String` `toString()` Returns a string representation of the object.

### Methods inherited from class java.lang.Object

`clone, finalize, getClass, notify, notifyAll, wait, wait, wait`

### Field Detail

#### KRB_NT_UNKNOWN

    public static final int KRB_NT_UNKNOWN

unknown name type.

See Also:
  Constant Field Values

#### KRB_NT_PRINCIPAL

    public static final int KRB_NT_PRINCIPAL

user principal name type.

See Also:
  Constant Field Values

#### KRB_NT_SRV_INST

    public static final int KRB_NT_SRV_INST

service and other unique instance (krbtgt) name type.

See Also:
  Constant Field Values

#### KRB_NT_SRV_HST

    public static final int KRB_NT_SRV_HST

service with host name as instance (telnet, rcommands) name type.

See Also:
  Constant Field Values

#### KRB_NT_SRV_XHST

    public static final int KRB_NT_SRV_XHST

service with host as remaining components name type.

See Also:
  Constant Field Values

#### KRB_NT_UID

    public static final int KRB_NT_UID

unique ID name type.

See Also:
  Constant Field Values

### Constructor Detail

#### KerberosPrincipal

    public KerberosPrincipal(String name)

Constructs a KerberosPrincipal from the provided string input. The name type for this principal defaults to `KRB_NT_PRINCIPAL` This string is assumed to contain a name in the format that is specified in Section 2.1.1. (Kerberos Principal Name Form) of RFC 1964 (for example, duke@FOO.COM, where duke represents a principal, and FOO.COM represents a realm).

If the input name does not contain a realm, the default realm is used. The default realm can be specified either in a Kerberos configuration file or via the java.security.krb5.realm system property. For more information, Kerberos Requirements

Parameters:
  `name` - the principal name
Throws:
  `IllegalArgumentException` - if name is improperly formatted, if name is null, or if name does not contain the realm to use and the default realm is not specified in either a Kerberos configuration file or via the java.security.krb5.realm system property.

#### KerberosPrincipal

    public KerberosPrincipal(String name,
                     int nameType)

Constructs a KerberosPrincipal from the provided string and name type input. The string is assumed to contain a name in the format that is specified in Section 2.1 (Mandatory Name Forms) of RFC 1964. Valid name types are specified in Section 6.2 (Principal Names) of RFC 4120. The input name must be consistent with the provided name type. (for example, duke@FOO.COM, is a valid input string for the name type, KRB_NT_PRINCIPAL where duke represents a principal, and FOO.COM represents a realm).

If the input name does not contain a realm, the default realm is used. The default realm can be specified either in a Kerberos configuration file or via the java.security.krb5.realm system property. For more information, see Kerberos Requirements.

Parameters:
  `name` - the principal name
  `nameType` - the name type of the principal
Throws:
  `IllegalArgumentException` - if name is improperly formatted, if name is null, if the nameType is not supported, or if name does not contain the realm to use and the default realm is not specified in either a Kerberos configuration file or via the java.security.krb5.realm system property.

### Method Detail

#### getRealm

    public String getRealm()

Returns the realm component of this Kerberos principal.

Returns:
  the realm component of this Kerberos principal.

#### hashCode

    public int hashCode()

Returns a hashcode for this principal. The hash code is defined to be the result of the following calculation:

      hashCode = getName().hashCode();

Specified by:
  `hashCode` in interface `Principal`
Overrides:
  `hashCode` in class `Object`
Returns:
  a hashCode() for the `KerberosPrincipal`
See Also:
  `Object.equals(java.lang.Object)`, `Hashtable`

#### equals

    public boolean equals(Object other)

Compares the specified Object with this Principal for equality. Returns true if the given object is also a `KerberosPrincipal` and the two `KerberosPrincipal` instances are equivalent. More formally two `KerberosPrincipal` instances are equal if the values returned by `getName()` are equal and the values returned by `getNameType()` are equal.

Specified by:
  `equals` in interface `Principal`
Overrides:
  `equals` in class `Object`
Parameters:
  `other` - the Object to compare to
Returns:
  true if the Object passed in represents the same principal as this one, false otherwise.
See Also:
  `Object.hashCode()`, `Hashtable`

#### getName

    public String getName()

The returned string corresponds to the single-string representation of a Kerberos Principal name as specified in Section 2.1 of RFC 1964.

Specified by:
  `getName` in interface `Principal`
Returns:
  the principal name.

#### getNameType

    public int getNameType()

Returns the name type of the KerberosPrincipal. Valid name types are specified in Section 6.2 of RFC4120.

Returns:
  the name type.

#### toString

    public String toString()

Description copied from class: `Object`
Returns a string representation of the object. In general, the `toString` method returns a string that "textually represents" this object. The result should be a concise but informative representation that is easy for a person to read. It is recommended that all subclasses override this method.

The `toString` method for class `Object` returns a string consisting of the name of the class of which the object is an instance, the at-sign character ``@`', and the unsigned hexadecimal representation of the hash code of the object. In other words, this method returns a string equal to the value of:

>      getClass().getName() + '@' + Integer.toHexString(hashCode())

Specified by:
  `toString` in interface `Principal`
Overrides:
  `toString` in class `Object`
Returns:
  a string representation of the object.

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