/**
* 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;
}
