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.framework.chooser; 35 36 import info.magnolia.ui.framework.chooser.definition.SingleItemWorkbenchChooserDefinition; 37 38 import java.util.Collections; 39 import java.util.Iterator; 40 import java.util.function.Consumer; 41 42 import com.vaadin.ui.Component; 43 44 /** 45 * Workbench chooser ensuring only one items at a time can be selected. 46 * 47 * @param <DD> type of datasource definition 48 * @param <T> type of items to be choosen 49 */ 50 public class SingleItemWorkbenchChooser<DD, T> implements Chooser<T> { 51 52 private final WorkbenchChooser<DD, T> workbenchChooser; 53 54 public SingleItemWorkbenchChooser(SingleItemWorkbenchChooserDefinition<DD, T> definition) { 55 workbenchChooser = create(definition.getWorkbenchChooser()); 56 } 57 58 @Override 59 public String getTitle() { 60 return workbenchChooser.getTitle(); 61 } 62 63 @Override 64 public Component asVaadinComponent() { 65 return workbenchChooser.asVaadinComponent(); 66 } 67 68 @Override 69 public void onChange(Consumer<T> callback) { 70 workbenchChooser.onChange(items -> 71 callback.accept(items.iterator().hasNext() ? items.iterator().next() : null)); 72 } 73 74 @Override 75 public T getChoice() { 76 final Iterator<T> iterator = workbenchChooser.getChoice().iterator(); 77 return iterator.hasNext() ? iterator.next() : null; 78 } 79 80 @Override 81 public void setChoice(T choice) { 82 workbenchChooser.setChoice(choice == null ? Collections.emptySet() : Collections.singleton(choice)); 83 } 84 }