com.trenako.validation.ISOLanguageValidator.java Source code

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Here is the source code for com.trenako.validation.ISOLanguageValidator.java

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/*
 * Copyright 2012 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.trenako.validation;

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

import javax.validation.ConstraintValidator;
import javax.validation.ConstraintValidatorContext;

import org.apache.commons.lang3.StringUtils;

import com.trenako.validation.constraints.ISOLanguage;

/**
 * It represents a validator for languages ISO codes.
 *
 * @author Carlo Micieli
 */
public class ISOLanguageValidator implements ConstraintValidator<ISOLanguage, String> {

    @Override
    public void initialize(ISOLanguage constraintAnnotation) {
    }

    @Override
    public boolean isValid(String value, ConstraintValidatorContext context) {
        if (StringUtils.isBlank(value)) {
            return true;
        }
        return Arrays.binarySearch(Locale.getISOLanguages(), value.toLowerCase()) >= 0;
    }

}