/**
* License Agreement.
*
* Rich Faces - Natural Ajax for Java Server Faces (JSF)
*
* Copyright (C) 2007 Exadel, Inc.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License version 2.1 as published by the Free Software Foundation.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
package org.richfaces.event.sort;
import java.util.Arrays;
import java.util.Iterator;
import java.util.LinkedList;
import java.util.List;
import javax.faces.component.UIComponent;
import javax.faces.context.FacesContext;
import org.richfaces.component.UIScrollableDataTable;
import org.richfaces.component.util.ColumnUtil;
import org.richfaces.model.SortField;
import org.richfaces.model.SortOrder;
import org.richfaces.model.selection.SimpleSelection;
/**
* Implementation of sortListener for multi-column sorting
* @author Maksim Kaszynski
*
*/
public class MultiColumnSortListener extends AbstractSortListener {
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();
//fix https://jira.jboss.org/jira/browse/RF-4368
SimpleSelection selection = (SimpleSelection) grid.getSelection();
if (selection != null) {
selection.clear();
grid.setActiveRowKey(null);
}
String sortColumn = e.getSortColumn();
UIComponent column = grid.findComponent(sortColumn);
String name = ColumnUtil.getColumnSorting(column);
SortOrder sortOrder = grid.getSortOrder();
if (sortOrder == null) {
sortOrder = new SortOrder();
grid.setSortOrder(sortOrder);
if (grid.getValueExpression("sortOrder") != null) {
grid.getValueExpression("sortOrder").setValue(FacesContext.getCurrentInstance().getELContext(), sortOrder);
}
}
Boolean suggested = e.getSuggestedOrder();
SortField[] fields = sortOrder.getFields();
if (fields == null) {
//If no sorting was applied at all, set sorting to current
fields = new SortField[] {new SortField(name, nextSortOrder(null, suggested))};
} else {
List<SortField> newFields = new LinkedList<SortField>(Arrays.asList(fields));
SortField newField = null;
for (Iterator<SortField> iterator = newFields.iterator(); iterator.hasNext() && newField == null; ) {
SortField sortField = (SortField) iterator.next();
if (name != null && name.equals(sortField.getName())) {
Boolean asc = sortField.getAscending();
newField = new SortField(name, nextSortOrder(asc, suggested));
iterator.remove();
}
}
if (newField == null) {
newField = new SortField(name, nextSortOrder(null, suggested));
}
newFields.add(newField);
fields = (SortField[]) newFields.toArray(new SortField[newFields.size()]);
}
sortOrder.setFields(fields);
}
}