/*

 * 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

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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:

 *

 * <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

 */

    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 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.

     *

     * @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;

    }

}