1 /** 2 * This file Copyright (c) 2018 Magnolia International 3 * Ltd. (http://www.magnolia-cms.com). All rights reserved. 4 * 5 * 6 * This file is dual-licensed under both the Magnolia 7 * Network Agreement and the GNU General Public License. 8 * You may elect to use one or the other of these licenses. 9 * 10 * This file is distributed in the hope that it will be 11 * useful, but AS-IS and WITHOUT ANY WARRANTY; without even the 12 * implied warranty of MERCHANTABILITY or FITNESS FOR A 13 * PARTICULAR PURPOSE, TITLE, or NONINFRINGEMENT. 14 * Redistribution, except as permitted by whichever of the GPL 15 * or MNA you select, is prohibited. 16 * 17 * 1. For the GPL license (GPL), you can redistribute and/or 18 * modify this file under the terms of the GNU General 19 * Public License, Version 3, as published by the Free Software 20 * Foundation. You should have received a copy of the GNU 21 * General Public License, Version 3 along with this program; 22 * if not, write to the Free Software Foundation, Inc., 51 23 * Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 24 * 25 * 2. For the Magnolia Network Agreement (MNA), this file 26 * and the accompanying materials are made available under the 27 * terms of the MNA which accompanies this distribution, and 28 * is available at http://www.magnolia-cms.com/mna.html 29 * 30 * Any modifications to this file must keep this entire header 31 * intact. 32 * 33 */ 34 package info.magnolia.ui.contentapp; 35 36 import java.util.stream.Stream; 37 38 import com.vaadin.data.provider.DataProviderWrapper; 39 import com.vaadin.data.provider.HierarchicalDataProvider; 40 import com.vaadin.data.provider.HierarchicalQuery; 41 42 /** 43 * Abstract wrapper class of {@link HierarchicalDataProvider}. Similar to Vaadin's own 44 * {@link DataProviderWrapper data provider wrapper}, but for some 45 * reason framework does not provide its own variation for the hierarchical providers. 46 * 47 * @param <T> 48 * data type 49 * @param <F> 50 * filter type 51 */ 52 public abstract class HierarchicalDataProviderWrapper<T, F> extends DataProviderWrapper<T, F, F> implements HierarchicalDataProvider<T, F> { 53 54 protected HierarchicalDataProviderWrapper(HierarchicalDataProvider<T, F> dataProvider) { 55 super(dataProvider); 56 } 57 58 protected HierarchicalDataProvider<T, F> dataProvider() { 59 return (HierarchicalDataProvider<T, F>) dataProvider; 60 } 61 62 @Override 63 public int getChildCount(HierarchicalQuery<T, F> query) { 64 return dataProvider().getChildCount(new HierarchicalQuery<>( 65 query.getOffset(), 66 query.getLimit(), 67 query.getSortOrders(), 68 query.getInMemorySorting(), 69 getFilter(query), 70 query.getParent())); 71 } 72 73 @Override 74 public Stream<T> fetchChildren(HierarchicalQuery<T, F> query) { 75 return dataProvider().fetchChildren(new HierarchicalQuery<>( 76 query.getOffset(), 77 query.getLimit(), 78 query.getSortOrders(), 79 query.getInMemorySorting(), 80 getFilter(query), 81 query.getParent())); 82 } 83 84 @Override 85 public boolean hasChildren(T item) { 86 return dataProvider().hasChildren(item); 87 } 88 }