/** * Constructs an instance of the BreadthFirstIterator class wrapping the Iterator of Iterators to * collectively traverse the Iterators in order, left to right, top to bottom. * * @param iterators the Iterator of Iterators to encapsulate in a breadth-first traversal. * @throws java.lang.NullPointerException if the Iterator of Iterators reference is null. * @see java.util.Iterator */ public BreadthFirstIterator(final Iterator<Iterator<T>> iterators) { Assert.notNull(iterators, "The Iterator of Iterators must not be null!"); for (Iterator<T> iterator : CollectionUtils.iterable(iterators)) { if (iterator != null) { this.iterators.add(iterator); } } }
/** * Constructs an instance of the {@link RegexFileFilter} class initialized with the given regular * expression (regex), expressed as a {@link Pattern}. * * @param regularExpression regular expression (regex) used to match and filter {@link File}s. * @throws IllegalArgumentException if the regular expression {@link Pattern} is null. * @see java.util.regex.Pattern */ public RegexFileFilter(Pattern regularExpression) { Assert.notNull(regularExpression, "The Regular Expression (Pattern) cannot be null"); this.regularExpression = regularExpression; }