/*
 * $Id$
 * $Revision$
 * $Date$
 *
 * ====================================================================
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *  http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package wicket.extensions.markup.html.repeater.data.table.filter;

import wicket.Component;
import wicket.extensions.markup.html.repeater.data.table.IColumn;

/**
 * Represents a data table column that can be filtered. The filter is
 * represented by a component returned from the getFilter() method.
 * 
 * @see IColumn
 * 
 * @author Igor Vaynberg (ivaynberg)
 * 
 */
public interface IFilteredColumn extends IColumn
{
	/**
	 * Returns the component used by user to filter the column. If null is
	 * returned, no filter will be added.
	 * 
	 * @param componentId
	 *            component id for returned filter component
	 * @param form
	 *            FilterForm object for the toolbar. components can use this
	 *            form's model to access properties of the state object (<code>PropertyModel(form.getModel(), "property"</code>)
	 *            or retrieve the {@link IFilterStateLocator} object by using
	 *            {@link FilterForm#getStateLocator() }
	 * @return component that will be used to represent a filter for this
	 *         column, or null if no such component is desired
	 */
	Component getFilter(String componentId, FilterForm form);

}