org.apache.commons.io.filefilter.FileFilterUtils#makeDirectoryOnly ( )源码实例Demo

@Override
public void run() {
    try {
        if (!shutdown.get()) {
            LOGGER.info("Actively cleaning up directories older than " + TimeUnit.MILLISECONDS.toHours(cleanupAgeMillis) + " hours");
            final IOFileFilter olderThanFilter = FileFilterUtils.asFileFilter(olderThanFileFilter(cleanupAgeMillis));
            final IOFileFilter tempDirFilter =
                FileFilterUtils.prefixFileFilter(prefix);

            /*
             * Delete directories that are:
             * older than [clean up age millis]
             * starts with temp-dir-prefix
             */
            final IOFileFilter deleteAfterMillisFilter = FileFilterUtils.makeDirectoryOnly(
                FileFilterUtils.andFileFilter(olderThanFilter, tempDirFilter)
            );
            deleteUserDirectories(rootDirectory, deleteAfterMillisFilter);
        } else {
            LOGGER.info("Currently shutdown, skipping older-than directory cleanup");
        }
    } catch (Exception e) {
        LOGGER.error("Unhandled Exception during directory cleanup", e);
    }
}
 

/**
 * Construct an instance with a directory and a file filter and an optional
 * limit on the <i>depth</i> navigated to.
 * <p>
 * The filters control which files and directories will be navigated to as part
 * of the walk. This constructor uses {@link FileFilterUtils#makeDirectoryOnly(IOFileFilter)}
 * and {@link FileFilterUtils#makeFileOnly(IOFileFilter)} internally to combine the filters.
 * A {@code null} filter means that no filtering should occur.
 *
 * @param directoryFilter  the filter to apply to directories, null means visit all directories
 * @param fileFilter  the filter to apply to files, null means visit all files
 * @param depthLimit  controls how <i>deep</i> the hierarchy is
 *  navigated to (less than 0 means unlimited)
 */
protected DirectoryWalker(IOFileFilter directoryFilter, IOFileFilter fileFilter, int depthLimit) {
    if (directoryFilter == null && fileFilter == null) {
        this.filter = null;
    } else {
        directoryFilter = directoryFilter != null ? directoryFilter : TrueFileFilter.TRUE;
        fileFilter = fileFilter != null ? fileFilter : TrueFileFilter.TRUE;
        directoryFilter = FileFilterUtils.makeDirectoryOnly(directoryFilter);
        fileFilter = FileFilterUtils.makeFileOnly(fileFilter);
        this.filter = FileFilterUtils.or(directoryFilter, fileFilter);
    }
    this.depthLimit = depthLimit;
}
 

/**
 * Construct an instance with a directory and a file filter and an optional
 * limit on the <i>depth</i> navigated to.
 * <p>
 * The filters control which files and directories will be navigated to as part
 * of the walk. This constructor uses {@link FileFilterUtils#makeDirectoryOnly(IOFileFilter)}
 * and {@link FileFilterUtils#makeFileOnly(IOFileFilter)} internally to combine the filters.
 * A {@code null} filter means that no filtering should occur.
 *
 * @param directoryFilter  the filter to apply to directories, null means visit all directories
 * @param fileFilter  the filter to apply to files, null means visit all files
 * @param depthLimit  controls how <i>deep</i> the hierarchy is
 *  navigated to (less than 0 means unlimited)
 */
protected DirectoryWalker(IOFileFilter directoryFilter, IOFileFilter fileFilter, final int depthLimit) {
    if (directoryFilter == null && fileFilter == null) {
        this.filter = null;
    } else {
        directoryFilter = directoryFilter != null ? directoryFilter : TrueFileFilter.TRUE;
        fileFilter = fileFilter != null ? fileFilter : TrueFileFilter.TRUE;
        directoryFilter = FileFilterUtils.makeDirectoryOnly(directoryFilter);
        fileFilter = FileFilterUtils.makeFileOnly(fileFilter);
        this.filter = FileFilterUtils.or(directoryFilter, fileFilter);
    }
    this.depthLimit = depthLimit;
}