PresenceValidator.java

/*
 * This file is part of the aidGer project.
 *
 * Copyright (C) 2010-2013 The aidGer Team
 *
 * 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 de.aidger.model.validators;

import static de.aidger.utils.Translation._;
import de.aidger.model.AbstractModel;

/**
 * Validates the presence of one or several members in the specified model class.
 *
 * @author aidGer Team
 */
public class PresenceValidator extends Validator {

    /**
     * Initialize the PresenceValidator class.
     */
    private PresenceValidator() {  }

    /**
     * Initialize the PresenceValidator class.
     *
     * @param members
     *              The members of the model to validate
     * @param trans
     *              The translated names
     */
    public PresenceValidator(String[] members,
            String[] trans) {
        super(members, trans);
        message = _("is empty");
    }

    /**
     * Validate one variable independently.
     *
     * @param o
     *              The variable to validate
     * @return True if the variable validates
     */
    public static boolean validate(Object o) {
        return (new PresenceValidator()).validateVar(o);
    }

    /**
     * Validate the variable.
     *
     * @param o
     *              The variable to validate
     * @return True if the input validates, false otherwise
     */
    @Override
    public boolean validateVar(Object o) {
        if (o == null) {
            return false;
        } else if (o.getClass().getName().equals(String.class.getName()) &&
                    ((String) o).isEmpty()) {
            return false;
        }
        return true;
    }
}