PrivateCredentialPermission (Java Platform SE 6) - JDK 5 Documentation v6.0, Java 2 SDK 英文文档

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Java™ Platform
Standard Ed. 6

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javax.security.auth
Class PrivateCredentialPermission

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

All Implemented Interfaces:: Serializable, Guard

public final class PrivateCredentialPermission
extends Permission
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".

See Also:: Serialized Form

Constructor Summary

PrivateCredentialPermission(String name, String actions)
          Creates a new PrivateCredentialPermission with the specified name.

Method Summary

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 inherited from class java.security.Permission

checkGuard, getName, toString

Methods inherited from class java.lang.Object

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

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

Method Summary
`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 inherited from class java.security.Permission
`checkGuard, getName, toString`

Methods inherited from 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(), Hashtable

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), Hashtable

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.