csns.web.validator.CourseValidator.java Source code

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Here is the source code for csns.web.validator.CourseValidator.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 java.util.regex.Pattern;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;
import org.springframework.util.StringUtils;
import org.springframework.validation.Errors;
import org.springframework.validation.ValidationUtils;
import org.springframework.validation.Validator;

import csns.model.academics.Course;
import csns.model.academics.dao.CourseDao;

@Component
public class CourseValidator implements Validator {

    @Autowired
    CourseDao courseDao;

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

    @Override
    public void validate(Object target, Errors errors) {
        Course course = (Course) target;

        ValidationUtils.rejectIfEmptyOrWhitespace(errors, "name", "error.field.required");

        String code = course.getCode();
        if (!StringUtils.hasText(code))
            errors.rejectValue("code", "error.field.required");
        else if (!Pattern.matches("[A-Z]+\\d+[A-Z]?", code))
            errors.rejectValue("code", "error.course.code.invalid");
        else {
            Course c = courseDao.getCourse(code);
            if (c != null && !c.getId().equals(course.getId()))
                errors.rejectValue("code", "error.course.exists");
        }
    }

}