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113 lines
3.9 KiB
Java
113 lines
3.9 KiB
Java
/*
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* Copyright (c) 1998, 2006, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation. Oracle designates this
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* particular file as subject to the "Classpath" exception as provided
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* by Oracle in the LICENSE file that accompanied this code.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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package sun.security.action;
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/**
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* A convenience class for retrieving the <code>Long</code> value of a system
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* property as a privileged action.
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*
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* <p>An instance of this class can be used as the argument of
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* <code>AccessController.doPrivileged</code>.
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*
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* <p>The following code retrieves the <code>Long</code> value of the system
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* property named <code>"prop"</code> as a privileged action. Since it does
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* not pass a default value to be used in case the property
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* <code>"prop"</code> is not defined, it has to check the result for
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* <code>null</code>:
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*
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* <pre>
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* Long tmp = java.security.AccessController.doPrivileged
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* (new sun.security.action.GetLongAction("prop"));
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* long l;
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* if (tmp != null) {
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* l = tmp.longValue();
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* }
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* </pre>
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*
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* <p>The following code retrieves the <code>Long</code> value of the system
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* property named <code>"prop"</code> as a privileged action, and also passes
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* a default value to be used in case the property <code>"prop"</code> is not
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* defined:
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*
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* <pre>
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* long l = java.security.AccessController.doPrivileged
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* (new GetLongAction("prop")).longValue();
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* </pre>
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*
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* @author Roland Schemers
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* @see java.security.PrivilegedAction
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* @see java.security.AccessController
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* @since 1.2
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*/
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public class GetLongAction implements java.security.PrivilegedAction<Long> {
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private String theProp;
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private long defaultVal;
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private boolean defaultSet = false;
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/**
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* Constructor that takes the name of the system property whose
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* <code>Long</code> value needs to be determined.
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*
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* @param theProp the name of the system property.
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*/
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public GetLongAction(String theProp) {
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this.theProp = theProp;
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}
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/**
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* Constructor that takes the name of the system property and the default
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* value of that property.
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*
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* @param theProp the name of the system property.
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* @param defaultVal the default value.
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*/
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public GetLongAction(String theProp, long defaultVal) {
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this.theProp = theProp;
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this.defaultVal = defaultVal;
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this.defaultSet = true;
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}
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/**
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* Determines the <code>Long</code> value of the system property whose
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* name was specified in the constructor.
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*
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* <p>If there is no property of the specified name, or if the property
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* does not have the correct numeric format, then a <code>Long</code>
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* object representing the default value that was specified in the
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* constructor is returned, or <code>null</code> if no default value was
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* specified.
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*
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* @return the <code>Long</code> value of the property.
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*/
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public Long run() {
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Long value = Long.getLong(theProp);
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if ((value == null) && defaultSet)
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return defaultVal;
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return value;
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}
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}
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