public void handleListChange(ListChangeEvent event) {
if (viewer.getControl().isDisposed()) {
return;
}
ListDiffEntry[] differences = event.diff.getDifferences();
for (int i = 0; i < differences.length; i++) {
ListDiffEntry entry = differences[i];
if (entry.isAddition()) {
knownElements.add(entry.getElement());
if (viewer instanceof AbstractListViewer) {
((AbstractListViewer) viewer).add(entry.getElement());
} else {
((TableViewer) viewer).insert(entry.getElement(), entry.getPosition());
}
} else {
if (viewer instanceof AbstractListViewer) {
((AbstractListViewer) viewer).remove(entry.getElement());
} else {
((TableViewer) viewer).remove(entry.getElement());
}
knownElements.remove(entry.getElement());
}
}
}
@Test
public void test() {
WritableSet set = new WritableSet(TestRealm.getDefault());
SetToListAdapter adapter = new SetToListAdapter(set, null);
ListChangeListener listener = new ListChangeListener();
adapter.addListChangeListener(listener);
set.add("Huhu");
ListDiffEntry e1 = listener.event.diff.getDifferences()[0];
assertTrue(e1.isAddition());
assertEquals("Huhu", e1.getElement());
assertEquals(1, adapter.size());
set.add("Haha");
e1 = listener.event.diff.getDifferences()[0];
assertTrue(e1.isAddition());
assertEquals("Haha", e1.getElement());
assertEquals(1, e1.getPosition());
assertEquals(2, adapter.size());
set.add("Blabla");
e1 = listener.event.diff.getDifferences()[0];
assertTrue(e1.isAddition());
assertEquals("Blabla", e1.getElement());
assertEquals(2, e1.getPosition());
assertEquals(3, adapter.size());
List<String> added = Arrays.asList("Blublu", "Foo", "Bar");
set.addAll(added);
e1 = listener.event.diff.getDifferences()[0];
ListDiffEntry e2 = listener.event.diff.getDifferences()[1];
ListDiffEntry e3 = listener.event.diff.getDifferences()[2];
assertEquals(3, listener.event.diff.getDifferences().length);
assertEquals(6, adapter.size());
assertTrue(e1.isAddition());
assertTrue(e2.isAddition());
assertTrue(e3.isAddition());
assertTrue(added.contains(e1.getElement()));
assertTrue(added.contains(e2.getElement()));
assertTrue(added.contains(e3.getElement()));
assertTrue(e1.getPosition() >= 3 && e1.getPosition() <= 5);
assertTrue(e2.getPosition() >= 3 && e1.getPosition() <= 5);
assertTrue(e3.getPosition() >= 3 && e1.getPosition() <= 5);
set.remove("Haha");
e1 = listener.event.diff.getDifferences()[0];
assertTrue(!e1.isAddition());
assertEquals("Haha", e1.getElement());
assertEquals(1, e1.getPosition());
assertEquals(5, adapter.size());
set.removeAll(added);
e1 = listener.event.diff.getDifferences()[0];
e2 = listener.event.diff.getDifferences()[1];
e3 = listener.event.diff.getDifferences()[2];
assertEquals(3, listener.event.diff.getDifferences().length);
assertEquals(2, adapter.size());
assertTrue(!e1.isAddition());
assertTrue(!e2.isAddition());
assertTrue(!e3.isAddition());
assertTrue(added.contains(e1.getElement()));
assertTrue(added.contains(e2.getElement()));
assertTrue(added.contains(e3.getElement()));
assertTrue(e1.getPosition() >= 2 && e1.getPosition() <= 4);
assertTrue(e2.getPosition() >= 2 && e1.getPosition() <= 4);
assertTrue(e3.getPosition() >= 2 && e1.getPosition() <= 4);
}