/**
* License Agreement.
*
* JBoss RichFaces 3.0 - Ajax4jsf Component Library
*
* 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.component.util;
import javax.el.ValueExpression;
import javax.faces.component.UIComponent;
import org.richfaces.component.Column;
/**
* @author Maksim Kaszynski
*
*/
public class ColumnUtil {
/**
* Extract sort expression from the column
*
* @param column
* @return logical representation of sort field assigned to column component given
* In case of EL-expression, an expression string is returned instead of value - so that EL-expression can be evaluated later;
* If there's literal value of dedicated attribute is specified, return it;
* If attribute is not set, fall aback to component id
*/
public static String getColumnSorting(UIComponent column) {
UIComponent component = (UIComponent) column;
ValueExpression binding = component.getValueExpression("sortExpression");
if (binding != null) {
return binding.getExpressionString();
}
if (component instanceof Column) {
Column col = (Column) component;
String sorting = col.getSortExpression();
if (sorting != null) {
return sorting;
}
}
return component.getId();
}
public static boolean isSortable(UIComponent component) {
if (component instanceof Column) {
return ((Column) component).isSortable();
}
return Boolean.valueOf(String.valueOf(component.getAttributes().get("sortable")));
}
}