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Proxima platform's module proxima-direct-io-hdfs

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/**
 * Copyright 2017-2020 O2 Czech Republic, a.s.
 *
 * 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 cz.o2.proxima.direct.hdfs;

import com.google.common.base.Preconditions;
import com.google.common.base.Strings;
import cz.o2.proxima.direct.core.DataAccessor;
import cz.o2.proxima.direct.core.DataAccessorFactory;
import cz.o2.proxima.direct.core.DirectDataOperator;
import cz.o2.proxima.repository.EntityDescriptor;
import java.net.URI;
import java.net.URISyntaxException;
import java.util.Map;
import lombok.EqualsAndHashCode;
import lombok.extern.slf4j.Slf4j;

/** Writer to HDFS. */
@Slf4j
@EqualsAndHashCode
public class HdfsStorage implements DataAccessorFactory {

  @Override
  public DataAccessor createAccessor(
      DirectDataOperator direct, EntityDescriptor entityDesc, URI uri, Map cfg) {

    return new HdfsDataAccessor(entityDesc, remap(uri), cfg);
  }

  private static URI remap(URI input) {
    if (input.getScheme().equals("hadoop")) {
      Preconditions.checkArgument(
          !Strings.isNullOrEmpty(input.getSchemeSpecificPart()),
          "When using generic `hadoop` scheme, please use scheme-specific part "
              + "for actual filesystem scheme");
      try {
        return new URI(
            input
                .toString()
                .replace("hadoop:" + input.getSchemeSpecificPart(), input.getSchemeSpecificPart()));
      } catch (URISyntaxException ex) {
        throw new RuntimeException(ex);
      }
    }
    return input;
  }

  @Override
  public Accept accepts(URI uri) {
    return uri.getScheme().equals("hdfs") || uri.getScheme().equals("hadoop")
        ? Accept.ACCEPT
        : Accept.REJECT;
  }
}