| /******************************************************************************* |
| * Copyright (c) 2007, 2009 Matthew Hall and others. |
| * All rights reserved. This program and the accompanying materials |
| * are made available under the terms of the Eclipse Public License v1.0 |
| * which accompanies this distribution, and is available at |
| * http://www.eclipse.org/legal/epl-v10.html |
| * |
| * Contributors: |
| * Matthew Hall - initial API and implementation (bug 208858) |
| * Matthew Hall - bug 272651 |
| ******************************************************************************/ |
| |
| package org.eclipse.core.tests.databinding.observable.list; |
| |
| import static org.junit.Assert.assertEquals; |
| import static org.junit.Assert.assertNotSame; |
| |
| import org.eclipse.core.databinding.observable.Diffs; |
| import org.eclipse.core.databinding.observable.list.ListDiff; |
| import org.eclipse.core.databinding.observable.list.ListDiffEntry; |
| import org.eclipse.core.databinding.observable.list.ListDiffVisitor; |
| import org.junit.Before; |
| import org.junit.Test; |
| |
| /** |
| * Tests for ListDiff class |
| * |
| * @since 1.1 |
| */ |
| public class ListDiffTest { |
| ListDiffVisitorStub visitor; |
| |
| @Before |
| public void setUp() throws Exception { |
| visitor = new ListDiffVisitorStub(); |
| } |
| |
| @Test |
| public void testAccept_Add() { |
| createListDiff(add(0, "element")).accept(visitor); |
| assertEquals("add(0,element)", visitor.log); |
| } |
| |
| @Test |
| public void testAccept_Remove() { |
| createListDiff(remove(0, "element")).accept(visitor); |
| assertEquals("remove(0,element)", visitor.log); |
| } |
| |
| @Test |
| public void testAccept_MoveForward_RemoveBeforeAdd() { |
| createListDiff(remove(0, "element"), add(1, "element")).accept(visitor); |
| assertEquals("move(0,1,element)", visitor.log); |
| } |
| |
| @Test |
| public void testAccept_MoveForward_AddBeforeRemove() { |
| // Add at index 2 then remove at index 0 leaves the element at index 1 |
| createListDiff(add(2, "element"), remove(0, "element")).accept(visitor); |
| assertEquals("move(0,1,element)", visitor.log); |
| } |
| |
| @Test |
| public void testAccept_MoveBackward_RemoveBeforeAdd() { |
| createListDiff(remove(4, "element"), add(1, "element")).accept(visitor); |
| assertEquals("move(4,1,element)", visitor.log); |
| } |
| |
| @Test |
| public void testAccept_MoveBackward_AddBeforeRemove() { |
| // Element is originally at position 4 in this test, but we must remove |
| // it at 5 since the adding it at 1 first changes the index |
| createListDiff(add(1, "element"), remove(5, "element")).accept(visitor); |
| assertEquals("move(4,1,element)", visitor.log); |
| } |
| |
| @Test |
| public void testAccept_Replace_RemoveBeforeAdd() { |
| createListDiff(remove(0, "element0"), add(0, "element1")).accept( |
| visitor); |
| assertEquals("replace(0,element0,element1)", visitor.log); |
| } |
| |
| @Test |
| public void testAccept_Replace_AddBeforeRemove() { |
| createListDiff(add(0, "element1"), remove(1, "element0")).accept( |
| visitor); |
| assertEquals("replace(0,element0,element1)", visitor.log); |
| } |
| |
| @Test |
| public void testAccept_AllPatterns() { |
| createListDiff(new ListDiffEntry[] { |
| // Replace (remove before add) |
| remove(0, "element0"), add(0, "element1"), |
| // Replace (add before remove) |
| add(0, "element3"), remove(1, "element2"), |
| // Remove |
| remove(1, "element4"), |
| // Add |
| add(2, "element5"), |
| // Move forward (remove before add) |
| remove(5, "element6"), add(6, "element6"), |
| // Move forward (add before remove) |
| add(7, "element6"), remove(5, "element6"), |
| // Move backward (remove before add) |
| remove(12, "element7"), add(11, "element7"), |
| // Move backward (add before remove) |
| add(11, "element7"), remove(13, "element7"), |
| // Remove then add in place -- treat as replace |
| remove(11, "element8"), add(11, "element8"), |
| // Add then remove in place (special case) -- treat as separate |
| // add and remove |
| add(12, "element9"), remove(12, "element9") }).accept(visitor); |
| assertEquals( |
| "replace(0,element0,element1), replace(0,element2,element3), " |
| + "remove(1,element4), " + "add(2,element5), " |
| + "move(5,6,element6), move(5,6,element6), " |
| + "move(12,11,element7), move(12,11,element7), " |
| + "replace(11,element8,element8), " |
| + "add(12,element9), remove(12,element9)", visitor.log); |
| } |
| |
| @Test |
| public void testAccept_MoveDetectionUsesEqualityNotSameness() { |
| Object element0 = new String("element"); |
| Object element1 = new String("element"); |
| assertNotSame(element0, element1); |
| assertEquals(element0, element1); |
| |
| createListDiff(remove(0, element0), add(1, element1)).accept(visitor); |
| assertEquals("move(0,1,element)", visitor.log); |
| } |
| |
| private ListDiffEntry add(int index, Object element) { |
| return Diffs.createListDiffEntry(index, true, element); |
| } |
| |
| private ListDiffEntry remove(int index, Object element) { |
| return Diffs.createListDiffEntry(index, false, element); |
| } |
| |
| private ListDiff createListDiff(ListDiffEntry difference) { |
| return createListDiff(new ListDiffEntry[] { difference }); |
| } |
| |
| private ListDiff createListDiff(ListDiffEntry first, ListDiffEntry second) { |
| return createListDiff(new ListDiffEntry[] { first, second }); |
| } |
| |
| private ListDiff createListDiff(ListDiffEntry[] differences) { |
| return Diffs.createListDiff(differences); |
| } |
| |
| class ListDiffVisitorStub extends ListDiffVisitor { |
| String log = ""; |
| |
| @Override |
| public void handleAdd(int index, Object element) { |
| log("add(" + index + "," + element + ")"); |
| } |
| |
| @Override |
| public void handleRemove(int index, Object element) { |
| log("remove(" + index + "," + element + ")"); |
| } |
| |
| @Override |
| public void handleMove(int oldIndex, int newIndex, Object element) { |
| log("move(" + oldIndex + "," + newIndex + "," + element + ")"); |
| } |
| |
| @Override |
| public void handleReplace(int index, Object oldElement, |
| Object newElement) { |
| log("replace(" + index + "," + oldElement + "," + newElement + ")"); |
| } |
| |
| private void log(String message) { |
| if (log.length() > 0) |
| log += ", "; |
| log += message; |
| } |
| } |
| } |