ru.mystamps.web.validation.jsr303.NotNullIfFirstFieldValidator.java Source code

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Here is the source code for ru.mystamps.web.validation.jsr303.NotNullIfFirstFieldValidator.java

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/*
 * Copyright (C) 2009-2017 Slava Semushin <slava.semushin@gmail.com>
 *
 * 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 2 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, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 */
package ru.mystamps.web.validation.jsr303;

import java.util.Objects;

import javax.validation.ConstraintValidator;
import javax.validation.ConstraintValidatorContext;

import org.apache.commons.lang3.StringUtils;

import org.springframework.beans.BeanWrapperImpl;
import org.springframework.beans.PropertyAccessor;

public class NotNullIfFirstFieldValidator implements ConstraintValidator<NotNullIfFirstField, Object> {

    private String firstFieldName;
    private String secondFieldName;

    @Override
    public void initialize(NotNullIfFirstField annotation) {
        firstFieldName = annotation.first();
        secondFieldName = annotation.second();
    }

    @Override
    public boolean isValid(Object value, ConstraintValidatorContext ctx) {

        if (value == null) {
            return true;
        }

        PropertyAccessor bean = new BeanWrapperImpl(value);

        Object firstField = bean.getPropertyValue(firstFieldName);
        String firstFieldValue = Objects.toString(firstField, "");
        if (StringUtils.isEmpty(firstFieldValue)) {
            return true;
        }

        Object secondField = bean.getPropertyValue(secondFieldName);
        String secondFieldValue = Objects.toString(secondField, "");
        if (StringUtils.isNotEmpty(secondFieldValue)) {
            return true;
        }

        // bind error message to 2nd field
        ConstraintViolationUtils.recreate(ctx, secondFieldName, ctx.getDefaultConstraintMessageTemplate());

        return false;
    }

}