com.github.ankurpathak.UsernameValidator Maven / Gradle / Ivy

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Java library for username validation for general use and with bean validation api.

There is a newer version: 1.4.0

package com.github.ankurpathak;

import com.github.ankurpathak.bean.constraints.validator.NotContainUnderscoreFollowedByPeriodValidator;
import com.github.ankurpathak.util.Strings;

public class UsernameValidator {

    public static final String CONSECUTIVE_PERIOD = "..";
    public static final String CONSECUTIVE_UNDERSCORE = "__";
    public static final String PERIOD_FOLLOWED_BY_UNDERSCORE = "._";
    public static final String UNDERSCORE_FOLLOWED_BY_PERIOD = "_.";

    public static boolean notContainConsecutivePeriod(String username) {
        return notContainConsecutivePattern(username, CONSECUTIVE_PERIOD);
    }


    public static boolean notContainConsecutiveUnderscore(String username) {
        return notContainConsecutivePattern(username, CONSECUTIVE_UNDERSCORE);
    }

    public static boolean notContainPeriodFollowedByUnderscore(String username) {
        return notContainConsecutivePattern(username, PERIOD_FOLLOWED_BY_UNDERSCORE);
    }

    public static boolean notContainUnderscoreFollowedByPeriod(String username) {
        return notContainConsecutivePattern(username, UNDERSCORE_FOLLOWED_BY_PERIOD);
    }


    private static boolean notContainConsecutivePattern(String username, String consecutivePattern) {
        if (Strings.isBlank(username)) {
            return true;
        } else {
            return !username.contains(consecutivePattern);
        }
    }


    public static boolean endWithAlphaNumeric(String username) {
        if (Strings.isBlank(username)) {
            return true;
        } else {
            if (Strings.isBlank(username)) {
                return false;
            } else {
                Character end = Strings.lastChar(username);
                return end != null && (Character.isDigit(end) || Character.isAlphabetic(end));
            }
        }
    }

    public static boolean startWithAlphaNumeric(String username) {
        if (Strings.isBlank(username)) {
            return true;
        } else {
            if (Strings.isBlank(username)) {
                return false;
            } else {
                Character start = Strings.firstChar(username);
                return start != null && (Character.isDigit(start) || Character.isAlphabetic(start));
            }
        }
    }


}