DirectoryScanner.java 文件源码

/**
 * Constructs a new {@code DirectoryScanner}.
 * <p>This constructor is
 * package protected, and this MBean cannot be created by a remote
 * client, because it needs a reference to the {@link ResultLogManager},
 * which cannot be provided from remote.
 * </p>
 * <p>This is a conscious design choice: {@code DirectoryScanner} MBeans
 * are expected to be completely managed (created, registered, unregistered)
 * by the {@link ScanManager} which does provide this reference.
 * </p>
 *
 * @param config This {@code DirectoryScanner} configuration.
 * @param logManager The info log manager with which to log the info
 *        records.
 * @throws IllegalArgumentException if one of the parameter is null, or if
 *         the provided {@code config} doesn't have its {@code name} set,
 *         or if the {@link DirectoryScannerConfig#getRootDirectory
 *         root directory} provided in the {@code config} is not acceptable
 *         (not provided or not found or not readable, etc...).
 **/
public DirectoryScanner(DirectoryScannerConfig config,
                        ResultLogManager logManager)
    throws IllegalArgumentException {
    if (logManager == null)
        throw new IllegalArgumentException("log=null");
    if (config == null)
        throw new IllegalArgumentException("config=null");
    if (config.getName() == null)
        throw new IllegalArgumentException("config.name=null");

     broadcaster = new NotificationBroadcasterSupport();

     // Clone the config: ensure data encapsulation.
     //
     this.config = XmlConfigUtils.xmlClone(config);

     // Checks that the provided root directory is valid.
     // Throws IllegalArgumentException if it isn't.
     //
     rootFile = validateRoot(config.getRootDirectory());

     // Initialize the Set<Action> for which this DirectoryScanner
     // is configured.
     //
     if (config.getActions() == null)
         actions = Collections.emptySet();
     else
         actions = EnumSet.copyOf(Arrays.asList(config.getActions()));
     this.logManager = logManager;
}