javadev / pt-backend

import java.util.regex.Matcher;

import java.util.regex.Pattern;

import org.springframework.stereotype.Component;

import org.springframework.validation.Errors;

import org.springframework.validation.Validator;

public class EmailValidator implements Validator {

    private static final Pattern EMAIL_PATTERN =

            Pattern.compile(

                    "^[a-zA-Z0-9.!#$%&'*+/=?^_`{|}~-]+@"

                            + "((\\[[0-9]{1,3}\\.[0-9]{1,3}\\.[0-9]{1,3}\\.[0-9]{1,3}\\])|(([a-zA-Z\\-0-9]+\\.)+[a-zA-Z]{2,}))$");

    @Override

    public void validate(final Object obj, final Errors errors) {

        final String email = (String) obj;

        if (email == null || email.trim().isEmpty()) {

            errors.reject("email", "Invalid empty email address");

            return;

        }

        final Matcher matcher = EMAIL_PATTERN.matcher(email);

        if (!matcher.matches()) {

            errors.reject("email", "Invalid email address (" + email + ")");

        }

    }

}