Ejemplo n.º 1
0
  /**
   * Apply sorting to the current ListDataSource.
   *
   * @param order the sort order list provided by the grid sort event
   */
  private void sort(final List<SortOrder> order) {
    DataSource<T> ds = grid.getDataSource();
    if (!(ds instanceof ListDataSource)) {
      throw new IllegalStateException("Grid " + grid + " data source is not a ListDataSource!");
    }

    ((ListDataSource<T>) ds)
        .sort(
            new Comparator<T>() {

              @Override
              @SuppressWarnings({"rawtypes", "unchecked"})
              public int compare(T a, T b) {

                for (SortOrder o : order) {

                  Grid.Column column = o.getColumn();
                  Comparator cmp = ListSorter.this.comparators.get(column);
                  int result = 0;
                  Object value_a = column.getValue(a);
                  Object value_b = column.getValue(b);
                  if (cmp != null) {
                    result = cmp.compare(value_a, value_b);
                  } else {
                    if (!(value_a instanceof Comparable)) {
                      throw new IllegalStateException(
                          "Column "
                              + column
                              + " has no assigned comparator and value "
                              + value_a
                              + " isn't naturally comparable");
                    }
                    result = ((Comparable) value_a).compareTo(value_b);
                  }

                  if (result != 0) {
                    return o.getDirection() == SortDirection.ASCENDING ? result : -result;
                  }
                }

                if (order.size() > 0) {
                  return order.get(0).getDirection() == SortDirection.ASCENDING
                      ? a.hashCode() - b.hashCode()
                      : b.hashCode() - a.hashCode();
                }
                return a.hashCode() - b.hashCode();
              }
            });
  }
Ejemplo n.º 2
0
  public ListSorter(Grid<T> grid) {

    if (grid == null) {
      throw new IllegalArgumentException("Grid can not be null");
    }

    this.grid = grid;
    comparators = new HashMap<>();

    sortHandlerRegistration =
        grid.addSortHandler(
            new SortHandler<T>() {
              @Override
              public void sort(SortEvent<T> event) {
                ListSorter.this.sort(event.getOrder());
              }
            });
  }