com.bixuebihui.db.MaxByteLengthValidator Maven / Gradle / Ivy

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a fast small database connection pool and a active record flavor mini framework

There is a newer version: 1.15.3.3

package com.bixuebihui.db;

import javax.validation.ConstraintValidator;
import javax.validation.ConstraintValidatorContext;
import javax.validation.constraints.Size;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;


import java.io.UnsupportedEncodingException;


/**
 * see 数据库字符串长度校验
 *    如果数据库用的是utf8mb4则长度会限制更短。
 *
 * @author xingwx
 * @version $Id: $Id
 */
public class MaxByteLengthValidator implements ConstraintValidator {
	private static final String UTF_8="UTF-8";
    private static final Logger LOG = LoggerFactory.getLogger(MaxByteLengthValidator.class);

    private int max;

    /**
     * initialize.
     *
     * @param constraintAnnotation a {@link javax.validation.constraints.Size} object.
     */
    @Override
    public void initialize(Size constraintAnnotation) {
        this.max = constraintAnnotation.max();
    }

    /**
     * {@inheritDoc}
     */
    @Override
    public boolean isValid(String object, ConstraintValidatorContext constraintContext) {
        try {
            return object == null || object.getBytes(UTF_8).length <= this.max;
        } catch (UnsupportedEncodingException e) {
            LOG.error("isValid", e);
        }
        return false;
    }
}