container/openejb-core/src/main/java/org/apache/openejb/assembler/classic/SingleValidatorFactoryWrapper.java

/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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 org.apache.openejb.assembler.classic;

import org.apache.openejb.bval.ValidatorUtil;
import org.apache.openejb.util.LogCategory;
import org.apache.openejb.util.Logger;

import javax.naming.NamingException;
import javax.validation.ClockProvider;
import javax.validation.ConstraintValidatorFactory;
import javax.validation.MessageInterpolator;
import javax.validation.ParameterNameProvider;
import javax.validation.TraversableResolver;
import javax.validation.Validator;
import javax.validation.ValidatorContext;
import javax.validation.ValidatorFactory;
import java.io.Serializable;

public class SingleValidatorFactoryWrapper implements ValidatorFactory, Serializable {
    public static final Logger logger = Logger.getInstance(LogCategory.OPENEJB, SingleValidatorFactoryWrapper.class);

    private transient volatile ValidatorFactory factory;

    public SingleValidatorFactoryWrapper(final ValidatorFactory factory) {
        this.factory = factory;
    }

    @Override
    public Validator getValidator() {
        return factory().getValidator();
    }

    private ValidatorFactory factory() {
        if (factory == null) {
            synchronized (this) {
                if (factory == null) {
                    try {
                        factory = ValidatorUtil.lookupFactory();
                    } catch (final NamingException e) {
                        throw new IllegalStateException(e);
                    }
                }
            }
        }
        return factory;
    }

    @Override
    public ValidatorContext usingContext() {
        return factory().usingContext();
    }

    @Override
    public MessageInterpolator getMessageInterpolator() {
        return factory().getMessageInterpolator();
    }

    @Override
    public TraversableResolver getTraversableResolver() {
        return factory().getTraversableResolver();
    }

    @Override
    public ConstraintValidatorFactory getConstraintValidatorFactory() {
        return factory().getConstraintValidatorFactory();
    }

    @Override
    public <T> T unwrap(final Class<T> tClass) {
        return factory().unwrap(tClass);
    }

    @Override
    public ParameterNameProvider getParameterNameProvider() {
        return factory().getParameterNameProvider();
    }

    @Override
    public ClockProvider getClockProvider()
    {
        return factory().getClockProvider();
    }

    @Override
    public void close() {
        final ValidatorFactory factory = this.factory;
        if (factory != null) {
            factory.close();
        }
    }
}