com.cognifide.aet.communication.api.util.ValidatorProvider Maven / Gradle / Ivy

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API for communication between system elements - runners and workers

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/**
 * AET
 *
 * Copyright (C) 2013 Cognifide Limited
 *
 * 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.cognifide.aet.communication.api.util;

import org.hibernate.validator.HibernateValidator;

import java.util.Collections;
import java.util.List;

import javax.validation.Validation;
import javax.validation.ValidationProviderResolver;
import javax.validation.Validator;
import javax.validation.spi.ValidationProvider;

public final class ValidatorProvider {

  private static volatile Validator validator;

  private ValidatorProvider() {
    //empty constructor
  }

  private static void initGenerator() {
    validator = Validation.byDefaultProvider()
            .providerResolver(new HibernateValidationProviderResolver())
            .configure().ignoreXmlConfiguration()
            .buildValidatorFactory()
            .getValidator();
  }

  public static Validator getValidator() {
    if (validator == null) {
      initGenerator();
    }
    return validator;
  }

  private static class HibernateValidationProviderResolver implements ValidationProviderResolver {

    @Override
    public List> getValidationProviders() {
      return Collections.>singletonList(new HibernateValidator());
    }
  }
}