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FlexDoc/Javadoc 2.0 Demo Java Doc |
Class PropertyPermission
java.util.PropertyPermission
All Implemented Interfaces:
public final class PropertyPermission
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.*" and "*" signify a wildcard
match, while "*java" and "a*b" do not.
The actions to be granted are passed to the constructor in a string containing
a list of one or more comma-separated keywords. The possible keywords are
"read" and "write". Their meaning is defined as follows:
- read
- read permission. Allows System.getProperty to
be called.
- write
- write permission. Allows System.setProperty to
be called.
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).
Since:
1.2
Author:
Roland Schemers
See Also:
Constructor Summary |
Creates a new PropertyPermission object with the specified name.
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Method Summary |
boolean |
Checks two PropertyPermission objects for equality.
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Returns the "canonical string representation" of the actions.
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int |
Returns the hash code value for this object.
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boolean |
Checks if this PropertyPermission object "implies" the specified
permission.
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Returns a new PermissionCollection object for storing
PropertyPermission objects.
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Methods inherited from class java.security. Permission |
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Methods inherited from class java.lang. Object |
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public PropertyPermission |
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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".
Parameters:
name - the name of the PropertyPermission.
actions - the actions string.
Throws:
Checks if this PropertyPermission object "implies" the specified
permission.
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".
Overrides:
Parameters:
p - the permission to check against.
Returns:
true if the specified permission is implied by this object,
false if not.
Checks two PropertyPermission objects for equality. Checks that
obj is
a PropertyPermission, and has the same name and actions as this object.
Overrides:
Parameters:
obj - the object we are testing for equality with this object.
Returns:
true if obj is a PropertyPermission, and has the same name and
actions as this PropertyPermission object.
See Also:
Returns the hash code value for this object.
The hash code used is the hash code of this permissions name, that is,
getName().hashCode(), where
getName is
from the Permission superclass.
Overrides:
Returns:
a hash code value for this object.
See Also:
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
getActions
will return the string "read,write".
Overrides:
Returns:
the canonical string representation of the actions.
Returns a new PermissionCollection object for storing
PropertyPermission objects.
Overrides:
Returns:
a new PermissionCollection object suitable for storing
PropertyPermissions.
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