Java Module java.base Package javax.security.auth Class PrivateCredentialPermission（JDK11）

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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"}*
 
```
For example, the following permission grants access to the com.sun.PrivateCredential owned by Subjects which have a com.sun.Principal with the name, "duke". Note that although this example, as well as all the examples below, do not contain Codebase, SignedBy, or Principal information in the grant statement (for simplicity reasons), actual policy configurations should specify that information when appropriate.
```
    grant {
      permission javax.security.auth.PrivateCredentialPermission
              "com.sun.PrivateCredential com.sun.Principal \"duke\"",
              "read";
    };
 
```
If CredentialClass is "*", then access is granted to all private Credentials belonging to the specified Subject. If "PrincipalName" is "*", then access is granted to the specified Credential owned by any Subject that has the specified Principal (the actual PrincipalName doesn't matter). For example, the following grants access to the a.b.Credential owned by any Subject that has an a.b.Principal.
```
    grant {
      permission javax.security.auth.PrivateCredentialPermission
              "a.b.Credential a.b.Principal "*"",
              "read";
    };
 
```
If both the PrincipalClass and "PrincipalName" are "*", then access is granted to the specified Credential owned by any Subject.
In addition, the PrincipalClass/PrincipalName pairing may be repeated:
```
    grant {
      permission javax.security.auth.PrivateCredentialPermission
              "a.b.Credential a.b.Principal "duke" c.d.Principal "dukette"",
              "read";
    };
 
```
The above grants access to the private Credential, "a.b.Credential", belonging to a Subject with at least two associated Principals: "a.b.Principal" with the name, "duke", and "c.d.Principal", with the name, "dukette".
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

All Methods Instance Methods Concrete Methods
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 Detail
  - 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 Detail
  - 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:
    
    a 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.

Java Module java.base Package javax.security.auth Class PrivateCredentialPermission（JDK11）

Class PrivateCredentialPermission

Constructor Summary

Method Summary

Methods declared in class java.security.Permission

Methods declared in class java.lang.Object

Constructor Detail

PrivateCredentialPermission

Method Detail

getCredentialClass

getPrincipals

implies

equals

hashCode

getActions

newPermissionCollection