com.carlomicieli.jtrains.validation.ISOValidationUtils.java Source code

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Here is the source code for com.carlomicieli.jtrains.validation.ISOValidationUtils.java

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/*
 * Copyright 2014 the original author or authors.
 *
 *  Licensed under the Apache License, Version 2.0 (the 'License');
 *  you may not use this file except in compliance with the License.
 *  You may obtain a copy of the License at
 *
 *    http://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an 'AS IS' BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 */
package com.carlomicieli.jtrains.validation;

import org.apache.commons.lang.StringUtils;

import java.util.Arrays;
import java.util.Locale;

/**
 * Utility methods to validate country and language codes against the ISO value.
 *
 * @author Carlo Micieli
 * @since 1.0
 */
public interface ISOValidationUtils {

    /**
     * Returns {@code true} if the value is a valid 2-letter language code as defined in ISO 639.
     * @param lang the language code
     * @return {@code true} if the value is a valid language; {@code false} otherwise
     */
    public static boolean languageIsValid(String lang) {
        if (StringUtils.isBlank(lang)) {
            return true;
        }
        return Arrays.binarySearch(Locale.getISOLanguages(), lang.toLowerCase()) >= 0;
    }

    /**
     * Returns {@code true} if the value is a valid 2-letter country code as defined in ISO 3166.
     * @param country the country code
     * @return {@code true} if the value is a valid country; {@code false} otherwise
     */
    public static boolean countryIsValid(String country) {
        if (StringUtils.isBlank(country)) {
            return true;
        }
        return Arrays.binarySearch(Locale.getISOCountries(), country.toUpperCase()) >= 0;
    }
}