info.magnolia.ui.form.field.transformer.basic.NotNullInitialStringValueTransformer.java Source code

Introduction

Here is the source code for info.magnolia.ui.form.field.transformer.basic.NotNullInitialStringValueTransformer.java

Source

/**
 * This file Copyright (c) 2013-2015 Magnolia International
 * Ltd.  (http://www.magnolia-cms.com). All rights reserved.
 *
 *
 * This file is dual-licensed under both the Magnolia
 * Network Agreement and the GNU General Public License.
 * You may elect to use one or the other of these licenses.
 *
 * This file is distributed in the hope that it will be
 * useful, but AS-IS and WITHOUT ANY WARRANTY; without even the
 * implied warranty of MERCHANTABILITY or FITNESS FOR A
 * PARTICULAR PURPOSE, TITLE, or NONINFRINGEMENT.
 * Redistribution, except as permitted by whichever of the GPL
 * or MNA you select, is prohibited.
 *
 * 1. For the GPL license (GPL), you can redistribute and/or
 * modify this file under the terms of the GNU General
 * Public License, Version 3, as published by the Free Software
 * Foundation.  You should have received a copy of the GNU
 * General Public License, Version 3 along with this program;
 * if not, write to the Free Software Foundation, Inc., 51
 * Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * 2. For the Magnolia Network Agreement (MNA), this file
 * and the accompanying materials are made available under the
 * terms of the MNA which accompanies this distribution, and
 * is available at http://www.magnolia-cms.com/mna.html
 *
 * Any modifications to this file must keep this entire header
 * intact.
 *
 */
package info.magnolia.ui.form.field.transformer.basic;

import info.magnolia.ui.api.i18n.I18NAuthoringSupport;
import info.magnolia.ui.form.field.definition.ConfiguredFieldDefinition;

import javax.inject.Inject;

import org.apache.commons.lang3.StringUtils;

import com.vaadin.data.Item;

/**
 * Implementation of {@link info.magnolia.ui.form.field.transformer.Transformer} that return a empty String it the requested property value do not exist.
 */
public class NotNullInitialStringValueTransformer extends BasicTransformer<String> {

    @Inject
    public NotNullInitialStringValueTransformer(Item relatedFormItem, ConfiguredFieldDefinition definition,
            Class<String> type, I18NAuthoringSupport i18NAuthoringSupport) {
        super(relatedFormItem, definition, type, i18NAuthoringSupport);
    }

    /**
     * If the initial property do not exist, do not return a Null.
     */
    @Override
    public String readFromItem() {
        String value = super.readFromItem();
        return (StringUtils.isBlank(value)) ? StringUtils.EMPTY : value;
    }

}