/** * Creates new composite iterator with provided iterators. */ public CompositeIterator(Iterator<T>... iterators) { for (Iterator<T> iterator : iterators) { add(iterator); } }
/** * {@inheritDoc} */ public T next() { if (!hasNext()) { throw new NoSuchElementException(); } return allIterators.get(currentIterator).next(); }
@Test void testRemoveWithOne() { CompositeIterator<Integer> compositeIterator = new CompositeIterator<>(); List<Integer> list = createList(4); compositeIterator.add(list.iterator()); int count = list.size(); while (compositeIterator.hasNext()) { compositeIterator.next(); compositeIterator.remove(); count--; } assertEquals(0, count); assertEquals(0, list.size()); }
@Test void testPartialIterationWithThree2() { List<Integer> list1 = createList(4); Iterator<Integer> it1 = list1.iterator(); List<Integer> list2 = createList(3); Iterator<Integer> it2 = list2.iterator(); List<Integer> list3 = createList(2); Iterator<Integer> it3 = list3.iterator(); it1.next(); it2.next(); it2.next(); it2.next(); it3.next(); CompositeIterator<Integer> compositeIterator = new CompositeIterator<>(it1, it2, it3); int count = 0; StringBuilder sb = new StringBuilder(); while (compositeIterator.hasNext()) { Integer next = compositeIterator.next(); sb.append(next); count++; } assertEquals(4, count); assertEquals("1231", sb.toString()); }
@Test void testRemoveFail() { List<Integer> list1 = createList(4); List<Integer> list2 = createList(4); CompositeIterator<Integer> compositeIterator = new CompositeIterator<>(); compositeIterator.add(list1.iterator()); compositeIterator.add(list2.iterator()); try { compositeIterator.remove(); fail("error"); } catch (Exception e) { // ignore } }
@Test void testNextWithThree() { List<Integer> list1 = createList(4); List<Integer> list2 = createList(4); List<Integer> list3 = createList(4); int count = list1.size() + list2.size() + list3.size(); CompositeIterator<Integer> compositeIterator = new CompositeIterator<>(); compositeIterator.add(list1.iterator()); compositeIterator.add(list2.iterator()); compositeIterator.add(list3.iterator()); while (compositeIterator.hasNext()) { compositeIterator.next(); count--; } assertEquals(0, count); }
@Test void testPartialIterationWithThree1() { List<Integer> list1 = createList(4); Iterator<Integer> it1 = list1.iterator(); List<Integer> list2 = createList(3); Iterator<Integer> it2 = list2.iterator(); List<Integer> list3 = createList(2); Iterator<Integer> it3 = list3.iterator(); it1.next(); it2.next(); it3.next(); CompositeIterator<Integer> compositeIterator = new CompositeIterator<>(it1, it2, it3); int count = 0; StringBuilder sb = new StringBuilder(); while (compositeIterator.hasNext()) { Integer next = compositeIterator.next(); sb.append(next); count++; } assertEquals(6, count); assertEquals("123121", sb.toString()); }
@Test void testNextWithTwo() { CompositeIterator<Integer> compositeIterator = new CompositeIterator<>(); List<Integer> list = createList(4); int count = list.size(); compositeIterator.add(list.iterator()); list = createList(4); count += list.size(); compositeIterator.add(list.iterator()); StringBuilder sb = new StringBuilder(); while (compositeIterator.hasNext()) { sb.append(compositeIterator.next()); count--; } assertEquals(0, count); assertEquals("01230123", sb.toString()); }
/** * Creates new composite iterator with provided iterators. */ public CompositeIterator(final Iterator<T>... iterators) { for (Iterator<T> iterator : iterators) { add(iterator); } }
/** * {@inheritDoc} */ @Override public T next() { if (!hasNext()) { throw new NoSuchElementException(); } return allIterators.get(currentIterator).next(); }
@Test void testRemoveWithTwo() { List<Integer> list1 = createList(4); List<Integer> list2 = createList(4); int count = list1.size() + list2.size(); CompositeIterator<Integer> compositeIterator = new CompositeIterator<>(); compositeIterator.add(list1.iterator()); compositeIterator.add(list2.iterator()); while (compositeIterator.hasNext()) { compositeIterator.next(); compositeIterator.remove(); count--; } assertEquals(0, count); assertEquals(0, list1.size()); assertEquals(0, list2.size()); }
/** * Creates new composite iterator with provided iterators. */ public CompositeIterator(Iterator<T>... iterators) { for (Iterator<T> iterator : iterators) { add(iterator); } }
/** * {@inheritDoc} */ @Override public T next() { if (!hasNext()) { throw new NoSuchElementException(); } return allIterators.get(currentIterator).next(); }
@Test void testRemoveWithThree() { List<Integer> list1 = createList(4); List<Integer> list2 = new ArrayList<>(); List<Integer> list3 = createList(4); int count = list1.size() + list2.size() + list3.size(); CompositeIterator<Integer> compositeIterator = new CompositeIterator<>(); compositeIterator.add(list1.iterator()); compositeIterator.add(list2.iterator()); compositeIterator.add(list3.iterator()); while (compositeIterator.hasNext()) { compositeIterator.next(); compositeIterator.remove(); count--; } assertEquals(0, count); assertEquals(0, list1.size()); assertEquals(0, list2.size()); assertEquals(0, list3.size()); }
/** * Creates new composite iterator with provided iterators. */ public CompositeIterator(final Iterator<T>... iterators) { for (Iterator<T> iterator : iterators) { add(iterator); } }
/** * {@inheritDoc} */ public T next() { if (hasNext() == false) { throw new NoSuchElementException(); } return allIterators.get(currentIterator).next(); }
@Test void testNextWithOne() { CompositeIterator<Integer> compositeIterator = new CompositeIterator<>(); try { compositeIterator.next(); fail("error"); } catch (NoSuchElementException e) { // ignore } List<Integer> list = createList(4); Iterator<Integer> iterator = list.iterator(); compositeIterator.add(iterator); try { compositeIterator.add(iterator); fail("error"); } catch (IllegalArgumentException iaex) { // ignore } int count = list.size(); StringBuilder sb = new StringBuilder(); while (compositeIterator.hasNext()) { sb.append(compositeIterator.next()); count--; } assertEquals(0, count); assertEquals("0123", sb.toString()); }