JavaTM 2 Platform Std. Ed. v1.4.2
- All Implemented Interfaces:
- Guard, Serializable
- public final class PropertyPermission
- extends BasicPermission
This class is for property permissions.
The name is the name of the property ("java.home",
"os.name", etc). The naming
convention follows the hierarchical property naming convention.
Also, an asterisk
may appear at the end of the name, following a ".", or by itself, to
signify a wildcard match. For example: "java.*" or "*" is valid,
"*java" or "a*b" is not valid.
The actions to be granted are passed to the constructor in a string containing
a list of zero or more comma-separated keywords. The possible keywords are
"read" and "write". Their meaning is defined as follows:
- read permission. Allows
- write permission. Allows
The actions string is converted to lowercase before processing.
Care should be taken before granting code permission to access
certain system properties. For example, granting permission to
access the "java.home" system property gives potentially malevolent
code sensitive information about the system environment (the Java
installation directory). Also, granting permission to access
the "user.name" and "user.home" system properties gives potentially
malevolent code sensitive information about the user environment
(the user's account name and home directory).
- See Also:
public PropertyPermission(String name,
- Creates a new PropertyPermission object with the specified name.
The name is the name of the system property, and
actions contains a comma-separated list of the
desired actions granted on the property. Possible actions are
"read" and "write".
name - the name of the PropertyPermission.
actions - the actions string.
public boolean implies(Permission p)
- Checks if this PropertyPermission object "implies" the specified
More specifically, this method returns true if:
- p is an instanceof PropertyPermission,
- p's actions are a subset of this
object's actions, and
- p's name is implied by this object's
name. For example, "java.*" implies "java.home".
implies in class
p - the permission to check against.
- true if the specified permission is implied by this object,
false if not.
public boolean equals(Object obj)
- Checks two PropertyPermission objects for equality. Checks that obj is
a PropertyPermission, and has the same name and actions as this object.
equals in class
obj - the object we are testing for equality with this object.
- true if obj is a PropertyPermission, and has the same name and
actions as this PropertyPermission object.
public int hashCode()
- Returns the hash code value for this object.
The hash code used is the hash code of this permissions name, that is,
from the Permission superclass.
hashCode in class
- a hash code value for this object.
public String getActions()
- Returns the "canonical string representation" of the actions.
That is, this method always returns present actions in the following order:
read, write. For example, if this PropertyPermission object
allows both write and read actions, a call to
will return the string "read,write".
getActions in class
- the canonical string representation of the actions.
public PermissionCollection newPermissionCollection()
- Returns a new PermissionCollection object for storing
newPermissionCollection in class
- a new PermissionCollection object suitable for storing
Copyright 2003 Sun Microsystems, Inc. All rights reserved