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/*
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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).
*
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* 2 along with this work; if not, write to the Free Software Foundation,
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*
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package sun.security.action;
/**
* A convenience class for retrieving the Long 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 Long value of the system
* property named "prop" as a privileged action. Since it does
* not pass a default value to be used in case the property
* "prop" is not defined, it has to check the result for
* null:
*
*
* Long tmp = java.security.AccessController.doPrivileged
* (new sun.security.action.GetLongAction("prop"));
* long l;
* if (tmp != null) {
* l = tmp.longValue();
* }
*
*
* The following code retrieves the Long value of the system
* property named "prop" as a privileged action, and also passes
* a default value to be used in case the property "prop" is not
* defined:
*
*
* long l = java.security.AccessController.doPrivileged
* (new GetLongAction("prop")).longValue();
*
*
* @author Roland Schemers
* @see java.security.PrivilegedAction
* @see java.security.AccessController
* @since 1.2
*/
public class GetLongAction implements java.security.PrivilegedAction {
private String theProp;
private long defaultVal;
private boolean defaultSet = false;
/**
* Constructor that takes the name of the system property whose
* Long value needs to be determined.
*
* @param theProp the name of the system property.
*/
public GetLongAction(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 defaultVal the default value.
*/
public GetLongAction(String theProp, long defaultVal) {
this.theProp = theProp;
this.defaultVal = defaultVal;
this.defaultSet = true;
}
/**
* Determines the Long value of the system property whose
* name was specified in the constructor.
*
* If there is no property of the specified name, or if the property
* does not have the correct numeric format, then a Long
* object representing the default value that was specified in the
* constructor is returned, or null if no default value was
* specified.
*
* @return the Long value of the property.
*/
public Long run() {
Long value = Long.getLong(theProp);
if ((value == null) && defaultSet)
return defaultVal;
return value;
}
}