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/*
 * 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.facebook.presto.orc;

import com.facebook.presto.orc.metadata.DwrfStripeCache;

import java.util.Optional;

import static java.util.Objects.requireNonNull;

public class DwrfAwareStripeMetadataSourceFactory
        implements StripeMetadataSourceFactory
{
    private final StripeMetadataSourceFactory delegateFactory;

    public DwrfAwareStripeMetadataSourceFactory(StripeMetadataSourceFactory delegateFactory)
    {
        this.delegateFactory = requireNonNull(delegateFactory, "delegateFactory is null");
    }

    @Override
    public StripeMetadataSource create(Optional dwrfStripeCache)
    {
        StripeMetadataSource delegate = requireNonNull(delegateFactory.create(dwrfStripeCache), "created delegate is null");
        if (dwrfStripeCache.isPresent()) {
            return new DwrfAwareStripeMetadataSource(delegate, dwrfStripeCache.get());
        }
        return delegate;
    }
}