package com.ydtech.validation;

import com.ydtech.validation.annotation.CheckDateTime;

import javax.validation.ConstraintValidator;
import javax.validation.ConstraintValidatorContext;
import java.text.SimpleDateFormat;

public class DateTimeValidator implements ConstraintValidator<CheckDateTime, String> {
    private CheckDateTime checkDateTime;

    @Override
    public void initialize(CheckDateTime checkDateTime) {
        this.checkDateTime = checkDateTime;
    }

    @Override
    public boolean isValid(String value, ConstraintValidatorContext context) {
        if (value == null) {
            return true;
        }
        String format = checkDateTime.format();
        if (value.length() != format.length()) {
            return false;
        }
        SimpleDateFormat simpleDateFormat = new SimpleDateFormat(format);

        try {
            simpleDateFormat.parse(value);
        } catch (Exception e) {
            return false;
        }
        return true;
    }

}