content: /*
   * The Alluxio Open Foundation licenses this work under the Apache License, version 2.0
   * (the "License"). You may not use this work except in compliance with the License, which is
   * available at www.apache.org/licenses/LICENSE-2.0
   *
   * This software is distributed on an "AS IS" basis, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND,
   * either express or implied, as more fully set forth in the License.
   *
   * See the NOTICE file distributed with this work for information regarding copyright ownership.
   */
  
  package alluxio.underfs.gcs;
  
  import alluxio.AlluxioURI;
  import alluxio.Constants;
  import alluxio.conf.PropertyKey;
  import alluxio.underfs.UnderFileSystem;
  import alluxio.underfs.UnderFileSystemConfiguration;
  import alluxio.underfs.UnderFileSystemFactory;
  import alluxio.underfs.gcs.v2.GCSV2UnderFileSystem;
  
  import com.google.common.base.Preconditions;
  import com.google.common.base.Throwables;
  import org.jets3t.service.ServiceException;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  import java.io.IOException;
  import javax.annotation.concurrent.ThreadSafe;
  
  /**
   * Factory for creating {@link GCSUnderFileSystem} or {@link GCSV2UnderFileSystem}
   * based on the {@link PropertyKey#UNDERFS_GCS_VERSION}.
   */
  @ThreadSafe
  public final class GCSUnderFileSystemFactory implements UnderFileSystemFactory {
    private static final Logger LOG = LoggerFactory.getLogger(GCSUnderFileSystemFactory.class);
    private static final int GCS_VERSION_TWO = 2;
  
    /**
     * Constructs a new {@link GCSUnderFileSystemFactory}.
     */
    public GCSUnderFileSystemFactory() {}
  
    @Override
    public UnderFileSystem create(String path, UnderFileSystemConfiguration conf) {
      Preconditions.checkNotNull(path, "path");
  
      if (conf.getInt(PropertyKey.UNDERFS_GCS_VERSION) == GCS_VERSION_TWO) {
        try {
          return GCSV2UnderFileSystem.createInstance(new AlluxioURI(path), conf);
        } catch (IOException e) {
          LOG.error("Failed to create GCSV2UnderFileSystem.", e);
          throw Throwables.propagate(e);
        }
      } else {
        try {
          return GCSUnderFileSystem.createInstance(new AlluxioURI(path), conf);
        } catch (ServiceException e) {
          LOG.error("Failed to create GCSUnderFileSystem.", e);
          throw Throwables.propagate(e);
        }
      }
    }
  
    @Override
    public boolean supportsPath(String path) {
      return path != null && path.startsWith(Constants.HEADER_GCS);
    }
  }
  