001/*
002 * This library is part of OpenCms -
003 * the Open Source Content Management System
004 *
005 * Copyright (c) Alkacon Software GmbH & Co. KG (http://www.alkacon.com)
006 *
007 * This library is free software; you can redistribute it and/or
008 * modify it under the terms of the GNU Lesser General Public
009 * License as published by the Free Software Foundation; either
010 * version 2.1 of the License, or (at your option) any later version.
011 *
012 * This library is distributed in the hope that it will be useful,
013 * but WITHOUT ANY WARRANTY; without even the implied warranty of
014 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
015 * Lesser General Public License for more details.
016 *
017 * For further information about Alkacon Software, please see the
018 * company website: http://www.alkacon.com
019 *
020 * For further information about OpenCms, please see the
021 * project website: http://www.opencms.org
022 *
023 * You should have received a copy of the GNU Lesser General Public
024 * License along with this library; if not, write to the Free Software
025 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
026 */
027
028package org.opencms.ui.util;
029
030import java.util.Locale;
031
032import org.restlet.engine.util.StringUtils;
033
034import com.vaadin.v7.data.util.converter.Converter;
035
036/**
037 * Converts null values to an empty string for the input widgets.<p>
038 */
039public class CmsNullToEmptyConverter implements Converter<String, String> {
040
041    /** Serial version id. */
042    private static final long serialVersionUID = 1L;
043
044    /**
045     * @see com.vaadin.data.util.converter.Converter#convertToModel(java.lang.Object, java.lang.Class, java.util.Locale)
046     */
047    public String convertToModel(String value, Class<? extends String> targetType, Locale locale)
048    throws com.vaadin.v7.data.util.converter.Converter.ConversionException {
049
050        return value;
051    }
052
053    /**
054     * @see com.vaadin.data.util.converter.Converter#convertToPresentation(java.lang.Object, java.lang.Class, java.util.Locale)
055     */
056    public String convertToPresentation(String value, Class<? extends String> targetType, Locale locale)
057    throws com.vaadin.v7.data.util.converter.Converter.ConversionException {
058
059        return StringUtils.nullToEmpty(value);
060    }
061
062    /**
063     * @see com.vaadin.data.util.converter.Converter#getModelType()
064     */
065    public Class<String> getModelType() {
066
067        return String.class;
068    }
069
070    /**
071     * @see com.vaadin.data.util.converter.Converter#getPresentationType()
072     */
073    public Class<String> getPresentationType() {
074
075        return String.class;
076    }
077
078}