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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
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* 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.
*
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package sun.security.action;
/**
* 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: <p>
*
* <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 java.security.PrivilegedAction<String> {
private String theProp;
private String defaultVal;
/**
* 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.
*
* @param theProp the name of the system property.
* @param defaulVal 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.
*
* @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;
}
}