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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 Also:
PrivilegedAction
AccessController
Since:
1.2/**
 * A convenience class for retrieving the <code>Long</code> 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 <code>Long</code> value of the system
 * property named <code>"prop"</code> as a privileged action. Since it does
 * not pass a default value to be used in case the property
 * <code>"prop"</code> is not defined, it has to check the result for
 * <code>null</code>: <p>
 *
 * <pre>
 * Long tmp = java.security.AccessController.doPrivileged
 *     (new sun.security.action.GetLongAction("prop"));
 * long l;
 * if (tmp != null) {
 *     l = tmp.longValue();
 * }
 * </pre>
 *
 * <p>The following code retrieves the <code>Long</code> value of the system
 * property named <code>"prop"</code> as a privileged action, and also passes
 * a default value to be used in case the property <code>"prop"</code> is not
 * defined: <p>
 *
 * <pre>
 * long l = java.security.AccessController.doPrivileged
 *      (new GetLongAction("prop")).longValue();
 * </pre>
 *
 * @author Roland Schemers
 * @see java.security.PrivilegedAction
 * @see java.security.AccessController
 * @since 1.2
 */

public class GetLongAction implements java.security.PrivilegedAction<Long> {
    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.
Params:
theProp – the name of the system property./**
     * Constructor that takes the name of the system property whose
     * <code>Long</code> 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.
Params:
theProp – the name of the system property.
defaulVal – 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 defaulVal 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.
Returns:
the Long value of the property./**
     * Determines the <code>Long</code> value of the system property whose
     * name was specified in the constructor.
     *
     * <p>If there is no property of the specified name, or if the property
     * does not have the correct numeric format, then a <code>Long</code>
     * object representing the default value that was specified in the
     * constructor is returned, or <code>null</code> if no default value was
     * specified.
     *
     * @return the <code>Long</code> value of the property.
     */
    public Long run() {
        Long value = Long.getLong(theProp);
        if ((value == null) && defaultSet)
            return new Long(defaultVal);
        return value;
    }
}