csns.web.validator.QuestionValidator.java Source code

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Here is the source code for csns.web.validator.QuestionValidator.java

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/*
 * This file is part of the CSNetwork Services (CSNS) project.
 * 
 * Copyright 2012, Chengyu Sun (csun@calstatela.edu).
 * 
 * CSNS is free software: you can redistribute it and/or modify it under the
 * terms of the GNU Affero General Public License as published by the Free
 * Software Foundation, either version 3 of the License, or (at your option)
 * any later version.
 * 
 * CSNS 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 Affero General Public License for
 * more details.
 * 
 * You should have received a copy of the GNU Affero General Public License
 * along with CSNS. If not, see http://www.gnu.org/licenses/agpl.html.
 */
package csns.web.validator;

import org.springframework.stereotype.Component;
import org.springframework.validation.Errors;
import org.springframework.validation.ValidationUtils;
import org.springframework.validation.Validator;

import csns.model.academics.Assignment;
import csns.model.qa.ChoiceQuestion;
import csns.model.qa.RatingQuestion;
import csns.model.qa.TextQuestion;

@Component
public class QuestionValidator implements Validator {

    @Override
    public boolean supports(Class<?> clazz) {
        return Assignment.class.isAssignableFrom(clazz);
    }

    @Override
    public void validate(Object target, Errors errors) {
        ValidationUtils.rejectIfEmptyOrWhitespace(errors, "description", "error.field.required");

        if (target instanceof ChoiceQuestion) {
            ChoiceQuestion question = (ChoiceQuestion) target;

            int minSelections = question.getMinSelections();
            int maxSelections = question.getMaxSelections();
            int numOfChoices = question.getNumOfChoices();

            if (maxSelections <= 0)
                maxSelections = 1;
            if (maxSelections > numOfChoices)
                maxSelections = numOfChoices;
            if (minSelections < 0)
                minSelections = 0;
            if (minSelections > maxSelections)
                minSelections = maxSelections;

            question.setMinSelections(minSelections);
            question.setMaxSelections(maxSelections);
        }

        if (target instanceof RatingQuestion) {
            RatingQuestion question = (RatingQuestion) target;
            if (question.getMinRating() > question.getMaxRating())
                question.setMinRating(question.getMaxRating());
        }

        if (target instanceof TextQuestion) {
            TextQuestion question = (TextQuestion) target;
            if (question.getTextLength() < 1)
                question.setTextLength(1);
        }
    }

}