org.sloth.util.ValidationUtils.java Source code

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Here is the source code for org.sloth.util.ValidationUtils.java

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/*
 * Copyright (C) 2009-2010  Stefan Arndt, Christian Autermann, Dustin Demuth,
 *                  Christoph Fendrich, Simon Ottenhues, Christian Paluschek
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
package org.sloth.util;

import static org.springframework.util.StringUtils.hasText;

import org.springframework.validation.Errors;

/**
 * Utility class for validation.
 * 
 * @author Christian Autermann
 * @author Stefan Arndt
 * @author Dustin Demuth
 * @author Christoph Fendrich
 * @author Simon Ottenhues
 * @author Christian Paluschek
 */
public class ValidationUtils extends org.springframework.validation.ValidationUtils {

    /**
     * Convenient method to check whether the specified {@code String} is
     * {@code null} or whitespace.
     * 
     * @param field
     *            the {@code String} to be tested
     * @return {@code true} if it is {@code null} or whitespace and {@code
     *         false} otherwise.
     */
    public static boolean isNotEmptyOrWhitespace(String field) {
        if (field == null || !hasText(field)) {
            return false;
        } else {
            return true;
        }
    }

    /**
     * Convenient method to check if an {@code Object} is {@code null}.
     * 
     * @param o
     *            the {@code Object} to be tested
     * @return {@code true} if {@code o} is {@code null} and {@code false}
     *         otherwise.
     */
    public static boolean notNull(Object o) {
        return o != null;
    }

    /**
     * 
     * @param errors
     *            the {@link Errors} instance that should store the errors (must
     *            not be <code>null</code>)
     * @param field
     *            the field name to check
     * @param errorCode
     *            the error code, interpretable as message key
     * @return {@code true} if field is not {@code null}, otherwise {@code
     *         false}
     */
    public static boolean rejectIfNull(Errors errors, String field, String errorCode) {
        if (notNull(errors.getFieldValue(field))) {
            return true;
        } else {
            errors.rejectValue(field, errorCode);
            return false;
        }
    }

    /**
     * 
     * @param errors
     *            the {@link Errors} instance that should store the errors (must
     *            not be <code>null</code>)
     * @param field
     *            the field name to check
     * @param errorCode
     *            the error code, interpretable as message key
     * @param maxLength
     *            the maximum length of {@code field}
     */
    public static void rejectIfTooLong(Errors errors, String field, String errorCode, int maxLength) {
        Object o = errors.getFieldValue(field);
        if (notNull(o)) {
            if (((String) o).length() > maxLength) {
                errors.rejectValue(field, errorCode);
            }
        }
    }
}