Quick test to demonstrate sorting one column based on another, hidden column

SortingTableWithHiddenProperty.java

        final VerticalLayout layout = new VerticalLayout();
        layout.setMargin(true);
        setContent(layout);

        IndexedContainer mainContainer = new IndexedContainer();
        mainContainer.addContainerProperty("prop1", Integer.class, "");
        mainContainer.addContainerProperty("prop2", Integer.class, "");
        mainContainer.addContainerProperty("prop3", Integer.class, "");

        Item item = mainContainer.addItem(1);
        item.getItemProperty("prop1").setValue(1);
        item.getItemProperty("prop2").setValue(4);
        item.getItemProperty("prop3").setValue(3);

        item = mainContainer.addItem(2);
        item.getItemProperty("prop1").setValue(3);
        item.getItemProperty("prop2").setValue(5);
        item.getItemProperty("prop3").setValue(2);

        mainContainer.setItemSorter(new DefaultItemSorter() {

            @Override
            protected int compareProperty(Object propertyId,
                    boolean sortDirection, Item item1, Item item2) {
                if ("prop3".equals(propertyId)) {
                    return super.compareProperty("prop2", sortDirection, item1,
                            item2);
                } else {
                    return super.compareProperty(propertyId, sortDirection,
                            item1, item2);
                }
            }
        });

        Table table = new Table("", mainContainer);
        table.setVisibleColumns("prop1", "prop3");

        layout.addComponent(table);