de.escidoc.admintool.view.validator.EmptyStringValidator.java Source code

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Here is the source code for de.escidoc.admintool.view.validator.EmptyStringValidator.java

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/**
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License, Version 1.0 only
 * (the "License").  You may not use this file except in compliance
 * with the License.
 *
 * You can obtain a copy of the license at license/ESCIDOC.LICENSE
 * or https://www.escidoc.org/license/ESCIDOC.LICENSE .
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at license/ESCIDOC.LICENSE.
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
 * information: Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 *
 *
 *
 * Copyright 2011 Fachinformationszentrum Karlsruhe Gesellschaft
 * fuer wissenschaftlich-technische Information mbH and Max-Planck-
 * Gesellschaft zur Foerderung der Wissenschaft e.V.
 * All rights reserved.  Use is subject to license terms.
 */
package de.escidoc.admintool.view.validator;

import com.vaadin.data.validator.AbstractValidator;

@SuppressWarnings("serial")
public class EmptyStringValidator extends AbstractValidator {

    private static final boolean ALLOW_NULL = false;

    public EmptyStringValidator(final String errorMessage) {
        super(errorMessage);
    }

    public boolean isValid(final Object value) {
        if (value == null) {
            return ALLOW_NULL;
        }

        return value.toString().trim().length() != 0;
    }

}