Java tutorial
/* * Licensed to the Apache Software Foundation (ASF) under one or more * contributor license agreements. See the NOTICE file distributed with * this work for additional information regarding copyright ownership. * The ASF licenses this file to You 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 org.apache.wicket.extensions.markup.html.repeater.data.table; import org.apache.wicket.Component; import org.apache.wicket.extensions.markup.html.repeater.data.grid.ICellPopulator; /** * An interface that represents a column in the {@link DefaultDataTable} * * @author Igor Vaynberg ( ivaynberg ) * @param <T> * the type of the object that will be rendered in this column's cells * @param <S> * the type of the sorting parameter */ public interface IColumn<T, S> extends ICellPopulator<T> { /** * Returns the component that will be used as the header for the column. * * This component will be contained in <span> tags. * * @param componentId * component id for the returned Component * * @return component that will be used as the header for the column */ Component getHeader(String componentId); /** * Returns the property that this header sorts on. * If {@code null} is returned the header will be not sortable. * * @return the sort property */ S getSortProperty(); /** * Returns true if the header of the column should be sortable * * @return true if header should be sortable */ default boolean isSortable() { return getSortProperty() != null; } /** * @return The number of rows the header of this column should span */ default int getHeaderRowspan() { return 1; } /** * @return The number of columns the header of this column should span */ default int getHeaderColspan() { return 1; } }