javax.security.auth
Class PrivateCredentialPermission
- Guard, Serializable
A permission governing access to a private credential. The action of this
permission is always "read" -- meaning that the private credential
information can be read from an object.
The target of this permission is formatted as follows:
CredentialClassName ( PrinicpalClassName PrincipalName )*
CredentialClassName is either the name of a private credential
class name, or a wildcard character (
'*'
).
PrinicpalClassName is the class name of a principal object, and
PrincipalName is a string representing the principal, or the
wildcard character.
clone , equals , finalize , getClass , hashCode , notify , notifyAll , toString , wait , wait , wait |
PrivateCredentialPermission
public PrivateCredentialPermission(String name,
String actions)
Create a new private credential permission.
name
- The permission target name.actions
- The list of actions, which, for this class, must be
"read"
.
equals
public boolean equals(Object o)
Determine whether this Object is semantically equal
to another Object.
There are some fairly strict requirements on this
method which subclasses must follow:
- It must be transitive. If
a.equals(b)
and
b.equals(c)
, then a.equals(c)
must be true as well. - It must be symmetric.
a.equals(b)
and
b.equals(a)
must have the same value. - It must be reflexive.
a.equals(a)
must
always be true. - It must be consistent. Whichever value a.equals(b)
returns on the first invocation must be the value
returned on all later invocations.
a.equals(null)
must be false.- It must be consistent with hashCode(). That is,
a.equals(b)
must imply
a.hashCode() == b.hashCode()
.
The reverse is not true; two objects that are not
equal may have the same hashcode, but that has
the potential to harm hashing performance.
This is typically overridden to throw a
ClassCastException
if the argument is not comparable to the class performing
the comparison, but that is not a requirement. It is legal
for
a.equals(b)
to be true even though
a.getClass() != b.getClass()
. Also, it
is typical to never cause a
NullPointerException
.
In general, the Collections API (
java.util
) use the
equals
method rather than the
==
operator to compare objects. However,
IdentityHashMap
is an exception to this rule, for its own good reasons.
The default implementation returns
this == o
.
- equals in interface Permission
- whether this Object is semantically equal to another
getActions
public String getActions()
Returns the actions this permission encompasses. For private credential
permissions, this is always the string "read"
.
- getActions in interface Permission
getCredentialClass
public String getCredentialClass()
Returns the credential class name that was embedded in this permission's
target name.
- The credential class name.
getPrincipals
public String[][] getPrincipals()
Returns the principal list that was embedded in this permission's target
name.
Each element of the returned array is a pair; the first element is the
principal class name, and the second is the principal name.
hashCode
public int hashCode()
Get a value that represents this Object, as uniquely as
possible within the confines of an int.
There are some requirements on this method which
subclasses must follow:
- Semantic equality implies identical hashcodes. In other
words, if
a.equals(b)
is true, then
a.hashCode() == b.hashCode()
must be as well.
However, the reverse is not necessarily true, and two
objects may have the same hashcode without being equal. - It must be consistent. Whichever value o.hashCode()
returns on the first invocation must be the value
returned on all later invocations as long as the object
exists. Notice, however, that the result of hashCode may
change between separate executions of a Virtual Machine,
because it is not invoked on the same object.
Notice that since
hashCode
is used in
Hashtable
and other hashing classes,
a poor implementation will degrade the performance of hashing
(so don't blindly implement it as returning a constant!). Also,
if calculating the hash is time-consuming, a class may consider
caching the results.
The default implementation returns
System.identityHashCode(this)
- hashCode in interface Permission
- the hash code for this Object
implies
public boolean implies(Permission p)
Test if this permission implies another. This method returns true if:
- p is an instance of PrivateCredentialPermission
- The credential class name of this instance matches that of p,
and one of the principals of p is contained in the principals of
this class. Thus,
[ * P "foo" ] implies [ C P "foo" ]
[ C P1 "foo" ] implies [ C P1 "foo" P2 "bar" ]
[ C P1 "*" ] implies [ C P1 "foo" ]
- implies in interface Permission
p
- The permission to check.
- True if this permission implies p.
PrivateCredentialPermission.java -- permissions governing private credentials.
Copyright (C) 2004 Free Software Foundation, Inc.
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