@Test public void changeTracking() { Anchor a = new Anchor(); a.setId("123"); a.setOffset(456.789); a.put("foo", "bar"); assertEquals(new Double(456.789), a.getOffset()); assertEquals("Offset and original are the same", a.getOriginalOffset(), a.getOffset()); assertEquals(Change.Operation.NoChange, a.getChange()); a.put("foo", "foo"); assertEquals("Only offset affects change:", Change.Operation.NoChange, a.getChange()); a.setOffset(123.456); assertEquals(new Double(123.456), a.getOffset()); assertEquals( "Original offset remembers first offset:", new Double(456.789), a.get("originalOffset")); assertEquals( "Original offset remembers first offset:", new Double(456.789), a.getOriginalOffset()); assertEquals(Change.Operation.Update, a.getChange()); a.setOffset(456.123); assertEquals(new Double(456.123), a.getOffset()); assertEquals("Original offset only set once:", new Double(456.789), a.getOriginalOffset()); assertEquals(Change.Operation.Update, a.getChange()); a.rollback(); assertEquals(new Double(456.789), a.getOffset()); assertEquals("Offset and original are the same", a.getOriginalOffset(), a.getOffset()); assertEquals(Change.Operation.NoChange, a.getChange()); a.destroy(); assertEquals(Change.Operation.Destroy, a.getChange()); a.rollback(); assertEquals(Change.Operation.NoChange, a.getChange()); a.create(); assertEquals(Change.Operation.Create, a.getChange()); a.rollback(); assertEquals("Create cannot be rolled back:", Change.Operation.Create, a.getChange()); }