# Class PrivateCredentialPermission

java.lang.Object
java.security.Permission
javax.security.auth.PrivateCredentialPermission

All Implemented Interfaces:
  `Serializable`, `Guard`

public final class PrivateCredentialPermission extends Permission
This class is used to protect access to private Credentials belonging to a particular `Subject`. The `Subject` is represented by a Set of Principals.

The target name of this `Permission` specifies a Credential class name, and a Set of Principals. The only valid value for this Permission's actions is, "read". The target name must abide by the following syntax:

          CredentialClass {PrincipalClass "PrincipalName"}*

API Note:
  This permission cannot be used for controlling access to resources as the Security Manager is no longer supported.
Since:
  1.4
See Also:
  - Serialized Form

- ## Constructor Summary

  Constructors
  Constructor
  Description
  `PrivateCredentialPermission(String name, String actions)`
  Creates a new `PrivateCredentialPermission` with the specified `name`.

- ## Method Summary

  Modifier and Type
  Method
  Description
  `boolean`
  `equals(Object obj)`
  Checks two `PrivateCredentialPermission` objects for equality.
  `String`
  `getActions()`
  Returns the "canonical string representation" of the actions.
  `String`
  `getCredentialClass()`
  Returns the Class name of the Credential associated with this `PrivateCredentialPermission`.
  `String[][]`
  `getPrincipals()`
  Returns the `Principal` classes and names associated with this `PrivateCredentialPermission`.
  `int`
  `hashCode()`
  Returns the hash code value for this object.
  `boolean`
  `implies(Permission p)`
  Checks if this `PrivateCredentialPermission` implies the specified `Permission`.
  `PermissionCollection`
  `newPermissionCollection()`
  Return a homogeneous collection of PrivateCredentialPermissions in a `PermissionCollection`.

  ### Methods declared in class java.security.Permission

  `checkGuard, getName, toString`

  ### Methods declared in class java.lang.Object

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

- ## Constructor Details

  - ### PrivateCredentialPermission

    public PrivateCredentialPermission(String name, String actions)
    Creates a new `PrivateCredentialPermission` with the specified `name`. The `name` specifies both a Credential class and a `Principal` Set.
    Parameters:
      `name` - the name specifying the Credential class and `Principal` Set.
      `actions` - the actions specifying that the Credential can be read.
    Throws:
      `IllegalArgumentException` - if `name` does not conform to the correct syntax or if `actions` is not "read".

- ## Method Details

  - ### getCredentialClass

    public String getCredentialClass()
    Returns the Class name of the Credential associated with this `PrivateCredentialPermission`.
    Returns:
      the Class name of the Credential associated with this `PrivateCredentialPermission`.

  - ### getPrincipals

    public String[][] getPrincipals()
    Returns the `Principal` classes and names associated with this `PrivateCredentialPermission`. The information is returned as a two-dimensional array (array[x][y]). The 'x' value corresponds to the number of `Principal` class and name pairs. When (y==0), it corresponds to the `Principal` class value, and when (y==1), it corresponds to the `Principal` name value. For example, array[0][0] corresponds to the class name of the first `Principal` in the array. array[0][1] corresponds to the `Principal` name of the first `Principal` in the array.
    Returns:
      the `Principal` class and names associated with this `PrivateCredentialPermission`.

  - ### implies

    public boolean implies(Permission p)
    Checks if this `PrivateCredentialPermission` implies the specified `Permission`.

    This method returns true if:

    - `p` is an instanceof PrivateCredentialPermission and
    - the target name for `p` is implied by this object's target name. For example:

            [* P1 "duke"] implies [a.b.Credential P1 "duke"].
            [C1 P1 "duke"] implies [C1 P1 "duke" P2 "dukette"].
            [C1 P2 "dukette"] implies [C1 P1 "duke" P2 "dukette"].

    Specified by:
      `implies` in class `Permission`
    Parameters:
      `p` - the `Permission` to check against.
    Returns:
      true if this `PrivateCredentialPermission` implies the specified `Permission`, false if not.

  - ### equals

    public boolean equals(Object obj)
    Checks two `PrivateCredentialPermission` objects for equality. Checks that `obj` is a `PrivateCredentialPermission`, and has the same credential class as this object, as well as the same Principals as this object. The order of the Principals in the respective Permission's target names is not relevant.
    Specified by:
      `equals` in class `Permission`
    Parameters:
      `obj` - the object we are testing for equality with this object.
    Returns:
      true if obj is a `PrivateCredentialPermission`, has the same credential class as this object, and has the same Principals as this object.
    See Also:
      - `Object.hashCode()`
      - `HashMap`

  - ### hashCode

    public int hashCode()
    Returns the hash code value for this object.
    Specified by:
      `hashCode` in class `Permission`
    Returns:
      the hash code value for this object
    See Also:
      - `Object.equals(java.lang.Object)`
      - `System.identityHashCode(java.lang.Object)`

  - ### getActions

    public String getActions()
    Returns the "canonical string representation" of the actions. This method always returns the String, "read".
    Specified by:
      `getActions` in class `Permission`
    Returns:
      the actions (always returns "read").

  - ### newPermissionCollection

    public PermissionCollection newPermissionCollection()
    Return a homogeneous collection of PrivateCredentialPermissions in a `PermissionCollection`. No such `PermissionCollection` is defined, so this method always returns `null`.
    Overrides:
      `newPermissionCollection` in class `Permission`
    Returns:
      null in all cases.