/**
*
*/
package org.richfaces.event.sort;
import java.util.Arrays;
import java.util.Iterator;
import java.util.LinkedList;
import java.util.List;
import javax.faces.context.FacesContext;
import org.richfaces.component.Column;
import org.richfaces.component.UIScrollableDataTable;
import org.richfaces.component.util.ColumnUtil;
import org.richfaces.model.SortField;
import org.richfaces.model.SortOrder;
/**
* Implementation of sortListener for multi-column sorting
* @author Maksim Kaszynski
*
*/
public class MultiColumnSortListener implements SortListener {
public static final MultiColumnSortListener INSTANCE = new MultiColumnSortListener();
private MultiColumnSortListener() {
}
/* (non-Javadoc)
* @see org.richfaces.event.sort.SortListener#processSort(org.richfaces.event.sort.SortEvent)
*/
public void processSort(SortEvent e) {
UIScrollableDataTable grid = (UIScrollableDataTable) e.getComponent();
int columnIndex = e.getSortColumn();
Column column =
(Column) grid.getChildren().get(columnIndex);
String name = ColumnUtil.getColumnSorting(column);
SortOrder sortOrder = grid.getSortOrder();
if (sortOrder == null) {
sortOrder = new SortOrder();
grid.setSortOrder(sortOrder);
if (grid.getValueBinding("sortOrder") != null) {
grid.getValueBinding("sortOrder").setValue(FacesContext.getCurrentInstance(), sortOrder);
}
}
SortField[] fields = sortOrder.getFields();
if (fields == null) {
//If no sorting was applied at all, set sorting to current
fields = new SortField[] {new SortField(name, columnIndex, Boolean.TRUE)};
} else {
List newFields = new LinkedList(Arrays.asList(fields));
SortField newField = null;
for (Iterator iterator = newFields.iterator(); iterator.hasNext() && newField == null; ) {
SortField sortField = (SortField) iterator.next();
if (sortField.getIndex() == columnIndex ||
(sortField.getName() != null &&
name != null &&
name.equals(sortField.getName()))) {
Boolean asc = sortField.getAscending();
asc = Boolean.TRUE.equals(asc) ? Boolean.FALSE : Boolean.TRUE;
newField = new SortField(name, columnIndex, asc);
iterator.remove();
}
}
if (newField == null) {
newField = new SortField(name, columnIndex, Boolean.TRUE);
}
newFields.add(newField);
fields = (SortField[]) newFields.toArray(new SortField[newFields.size()]);
}
sortOrder.setFields(fields);
}
}