| /* |
| * Copyright 2007 Google Inc. |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); you may not |
| * use this file except in compliance with the License. You may obtain a copy of |
| * the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT |
| * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the |
| * License for the specific language governing permissions and limitations under |
| * the License. |
| */ |
| package com.google.gwt.user.client.ui; |
| |
| import com.google.gwt.junit.client.GWTTestCase; |
| |
| import java.util.Iterator; |
| import java.util.NoSuchElementException; |
| |
| /** |
| * Tests {@link WidgetIterators}. |
| */ |
| public class WidgetIteratorsTest extends GWTTestCase { |
| |
| /** |
| * Provides a class from which to construct mock containers in this test. |
| */ |
| private static class MockWidget implements HasWidgets { |
| public void add(Widget w) { |
| fail("Unexpected call to add(Widget)"); |
| } |
| |
| public void clear() { |
| fail("Unexpected call to clear()"); |
| } |
| |
| public Iterator<Widget> iterator() { |
| fail("Unexpected call to iterator()"); |
| return null; |
| } |
| |
| public boolean remove(Widget w) { |
| fail("Unexpected call to remove(Widget)"); |
| return false; |
| } |
| } |
| |
| public String getModuleName() { |
| return "com.google.gwt.user.User"; |
| } |
| |
| /** |
| * Tests that empty arrays operate properly. |
| */ |
| public void testEmptyArray() { |
| final Iterator<Widget> subject = WidgetIterators.createWidgetIterator( |
| new MockWidget(), new Widget[] {null, null}); |
| assertFalse(subject.hasNext()); |
| assertNextFails(subject); |
| assertRemoveFails(subject); |
| } |
| |
| /** |
| * Tests that remove operates properly on an array of widgets that includes |
| * <code>null</code>. |
| */ |
| public void testRemove() { |
| final int[] expectedRemoveIndex = new int[1]; |
| |
| final Widget[] widgets = new Widget[] { |
| null, createTestWidget(), null, createTestWidget(), null, null}; |
| |
| final MockWidget mock = new MockWidget() { |
| public boolean remove(Widget w) { |
| assertEquals(widgets[expectedRemoveIndex[0]], w); |
| return true; |
| } |
| }; |
| |
| final Iterator<Widget> subject = WidgetIterators.createWidgetIterator(mock, widgets); |
| |
| expectedRemoveIndex[0] = 1; |
| assertTrue(subject.hasNext()); |
| assertEquals(widgets[1], subject.next()); |
| subject.remove(); |
| assertRemoveFails(subject); |
| |
| expectedRemoveIndex[0] = 3; |
| assertTrue(subject.hasNext()); |
| assertEquals(widgets[3], subject.next()); |
| subject.remove(); |
| assertRemoveFails(subject); |
| |
| assertFalse(subject.hasNext()); |
| assertNextFails(subject); |
| } |
| |
| /** |
| * Tests that the common iteration pattern works on an array of widgets that |
| * contains <code>null</code>. |
| */ |
| public void testStandardIteration() { |
| final MockWidget mock = new MockWidget(); |
| final Widget[] widgets = new Widget[] { |
| null, createTestWidget(), null, createTestWidget(), null, null}; |
| final Iterator<Widget> subject = WidgetIterators.createWidgetIterator(mock, widgets); |
| |
| assertTrue(subject.hasNext()); |
| assertEquals(widgets[1], subject.next()); |
| |
| assertTrue(subject.hasNext()); |
| assertEquals(widgets[3], subject.next()); |
| |
| assertFalse(subject.hasNext()); |
| assertNextFails(subject); |
| } |
| |
| private void assertNextFails(Iterator<Widget> iterator) { |
| try { |
| iterator.next(); |
| fail("Expected NoSuchElementException."); |
| } catch (NoSuchElementException e) { |
| // This page left intentionally blank. |
| } |
| } |
| |
| private void assertRemoveFails(Iterator<Widget> iterator) { |
| try { |
| iterator.remove(); |
| fail("Expected IllegalStateException."); |
| } catch (IllegalStateException e) { |
| // The page left intentionally blank. |
| } |
| } |
| |
| private Widget createTestWidget() { |
| return new Label("Shazam!"); |
| } |
| } |