/*
* Copyright (c) 1998, 2006, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
package sun.security.action;
import java.security.AccessController;
import java.security.PrivilegedAction;
import java.util.Properties;
A convenience class for retrieving the string value of a system
property as a privileged action.
An instance of this class can be used as the argument of
AccessController.doPrivileged.
The following code retrieves the value of the system
property named "prop" as a privileged action:
String s = java.security.AccessController.doPrivileged
(new GetPropertyAction("prop"));
Author: Roland Schemers See Also: Since: 1.2
/**
* A convenience class for retrieving the string value of a system
* property as a privileged action.
*
* <p>An instance of this class can be used as the argument of
* <code>AccessController.doPrivileged</code>.
*
* <p>The following code retrieves the value of the system
* property named <code>"prop"</code> as a privileged action:
*
* <pre>
* String s = java.security.AccessController.doPrivileged
* (new GetPropertyAction("prop"));
* </pre>
*
* @author Roland Schemers
* @see java.security.PrivilegedAction
* @see java.security.AccessController
* @since 1.2
*/
public class GetPropertyAction implements PrivilegedAction<String> {
private String theProp;
private String defaultVal;
Constructor that takes the name of the system property whose
string value needs to be determined.
Params: - theProp – the name of the system property.
/**
* Constructor that takes the name of the system property whose
* string value needs to be determined.
*
* @param theProp the name of the system property.
*/
public GetPropertyAction(String theProp) {
this.theProp = theProp;
}
Constructor that takes the name of the system property and the default
value of that property.
Params: - theProp – the name of the system property.
- defaultVal – the default value.
/**
* Constructor that takes the name of the system property and the default
* value of that property.
*
* @param theProp the name of the system property.
* @param defaultVal the default value.
*/
public GetPropertyAction(String theProp, String defaultVal) {
this.theProp = theProp;
this.defaultVal = defaultVal;
}
Determines the string value of the system property whose
name was specified in the constructor.
Returns: the string value of the system property,
or the default value if there is no property with that key.
/**
* Determines the string value of the system property whose
* name was specified in the constructor.
*
* @return the string value of the system property,
* or the default value if there is no property with that key.
*/
public String run() {
String value = System.getProperty(theProp);
return (value == null) ? defaultVal : value;
}
Convenience method to get a property without going through doPrivileged
if no security manager is present. This is unsafe for inclusion in a
public API but allowable here since this class is now encapsulated.
Note that this method performs a privileged action using caller-provided
inputs. The caller of this method should take care to ensure that the
inputs are not tainted and the returned property is not made accessible
to untrusted code if it contains sensitive information.
Params: - theProp – the name of the system property.
/**
* Convenience method to get a property without going through doPrivileged
* if no security manager is present. This is unsafe for inclusion in a
* public API but allowable here since this class is now encapsulated.
*
* Note that this method performs a privileged action using caller-provided
* inputs. The caller of this method should take care to ensure that the
* inputs are not tainted and the returned property is not made accessible
* to untrusted code if it contains sensitive information.
*
* @param theProp the name of the system property.
*/
public static String privilegedGetProperty(String theProp) {
if (System.getSecurityManager() == null) {
return System.getProperty(theProp);
} else {
return AccessController.doPrivileged(
new GetPropertyAction(theProp));
}
}
Convenience method to get a property without going through doPrivileged
if no security manager is present. This is unsafe for inclusion in a
public API but allowable here since this class is now encapsulated.
Note that this method performs a privileged action using caller-provided
inputs. The caller of this method should take care to ensure that the
inputs are not tainted and the returned property is not made accessible
to untrusted code if it contains sensitive information.
Params: - theProp – the name of the system property.
- defaultVal – the default value.
/**
* Convenience method to get a property without going through doPrivileged
* if no security manager is present. This is unsafe for inclusion in a
* public API but allowable here since this class is now encapsulated.
*
* Note that this method performs a privileged action using caller-provided
* inputs. The caller of this method should take care to ensure that the
* inputs are not tainted and the returned property is not made accessible
* to untrusted code if it contains sensitive information.
*
* @param theProp the name of the system property.
* @param defaultVal the default value.
*/
public static String privilegedGetProperty(String theProp,
String defaultVal) {
if (System.getSecurityManager() == null) {
return System.getProperty(theProp, defaultVal);
} else {
return AccessController.doPrivileged(
new GetPropertyAction(theProp, defaultVal));
}
}
Convenience method to call System.getProperties without
having to go through doPrivileged if no security manager is present.
This is unsafe for inclusion in a public API but allowable here since
this class is now encapsulated.
Note that this method performs a privileged action, and callers of
this method should take care to ensure that the returned properties
are not made accessible to untrusted code since it may contain
sensitive information.
/**
* Convenience method to call <code>System.getProperties</code> without
* having to go through doPrivileged if no security manager is present.
* This is unsafe for inclusion in a public API but allowable here since
* this class is now encapsulated.
*
* Note that this method performs a privileged action, and callers of
* this method should take care to ensure that the returned properties
* are not made accessible to untrusted code since it may contain
* sensitive information.
*/
public static Properties privilegedGetProperties() {
if (System.getSecurityManager() == null) {
return System.getProperties();
} else {
return AccessController.doPrivileged(
new PrivilegedAction<Properties>() {
public Properties run() {
return System.getProperties();
}
}
);
}
}
}