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.gwt.client.ui.input;
029
030import org.opencms.gwt.client.validation.I_CmsValidationController;
031import org.opencms.gwt.client.validation.I_CmsValidator;
032import org.opencms.gwt.shared.CmsValidationResult;
033import org.opencms.util.CmsStringUtil;
034
035/**
036 * A validator that checks whether a field is not empty.<p>
037 *
038 * @since 8.0.0
039 */
040public class CmsNonEmptyValidator implements I_CmsValidator {
041
042    /** The error message to display if the validation fails. */
043    private String m_errorMessage;
044
045    /**
046     * Constructs a new validator with a given error message.<p>
047     *
048     * @param errorMessage the error message to use when the validated field is empty
049     */
050    public CmsNonEmptyValidator(String errorMessage) {
051
052        m_errorMessage = errorMessage;
053    }
054
055    /**
056     * @see org.opencms.gwt.client.validation.I_CmsValidator#validate(org.opencms.gwt.client.ui.input.I_CmsFormField, org.opencms.gwt.client.validation.I_CmsValidationController)
057     */
058    public void validate(I_CmsFormField field, I_CmsValidationController controller) {
059
060        String value = field.getWidget().getFormValueAsString();
061        CmsValidationResult result;
062        if (CmsStringUtil.isEmptyOrWhitespaceOnly(value)) {
063            result = new CmsValidationResult(m_errorMessage);
064        } else {
065            result = CmsValidationResult.VALIDATION_OK;
066        }
067        controller.provideValidationResult(field.getId(), result);
068    }
069}