1 /** 2 * This file Copyright (c) 2013-2018 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.form.field.transformer.basic; 35 36 import info.magnolia.ui.api.i18n.I18NAuthoringSupport; 37 import info.magnolia.ui.form.field.definition.ConfiguredFieldDefinition; 38 39 import javax.inject.Inject; 40 41 import org.apache.commons.lang3.StringUtils; 42 43 import com.vaadin.v7.data.Item; 44 45 /** 46 * Implementation of {@link info.magnolia.ui.form.field.transformer.Transformer} that return a empty String it the requested property value do not exist. 47 */ 48 public class NotNullInitialStringValueTransformer extends BasicTransformer<String> { 49 50 @Inject 51 public NotNullInitialStringValueTransformer(Item relatedFormItem, ConfiguredFieldDefinition definition, Class<String> type, I18NAuthoringSupport i18NAuthoringSupport) { 52 super(relatedFormItem, definition, type, i18NAuthoringSupport); 53 } 54 55 /** 56 * If the initial property do not exist, do not return a Null. 57 */ 58 @Override 59 public String readFromItem() { 60 String value = super.readFromItem(); 61 return (StringUtils.isBlank(value)) ? StringUtils.EMPTY : value; 62 } 63 64 }