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.job.plan.transform.format;
  
  import alluxio.AlluxioURI;
  import alluxio.Constants;
  import alluxio.client.ReadType;
  import alluxio.client.WriteType;
  import alluxio.conf.PropertyKey;
  import alluxio.exception.ExceptionMessage;
  import alluxio.uri.NoAuthority;
  
  import com.google.common.base.Preconditions;
  import org.apache.hadoop.conf.Configuration;
  
  /**
   * Utilities for implementing {@link TableReader} and {@link TableWriter}.
   */
  public final class ReadWriterUtils {
    private static final String ALLUXIO_HADOOP_FILESYSTEM_DISABLE_CACHE =
        "fs.alluxio.impl.disable.cache";
  
    /**
     * Checks preconditions of uri.
     *
     * @param uri the URI to check
     */
    public static void checkUri(AlluxioURI uri) {
      Preconditions.checkArgument(uri.getScheme() != null && !uri.getScheme().isEmpty(),
          ExceptionMessage.TRANSFORM_TABLE_URI_LACKS_SCHEME.getMessage(uri));
      if (uri.getScheme().equals(Constants.SCHEME)) {
        Preconditions.checkArgument(uri.getAuthority() != null
                && !uri.getAuthority().equals(NoAuthority.INSTANCE),
            ExceptionMessage.TRANSFORM_TABLE_URI_LACKS_AUTHORITY.getMessage(uri));
      }
    }
  
    /**
     * @return a new Hadoop conf with alluxio read type set to no cache
     */
    public static Configuration readNoCacheConf() {
      Configuration conf = new Configuration();
      conf.setEnum(PropertyKey.USER_FILE_READ_TYPE_DEFAULT.getName(), ReadType.NO_CACHE);
      // The cached filesystem might not be configured with the above read type.
      conf.setBoolean(ALLUXIO_HADOOP_FILESYSTEM_DISABLE_CACHE, true);
      return conf;
    }
  
    /**
     * @return a new Hadoop conf with alluxio write type set to through
     */
    public static Configuration writeThroughConf() {
      Configuration conf = new Configuration();
      conf.setEnum(PropertyKey.USER_FILE_WRITE_TYPE_DEFAULT.getName(), WriteType.THROUGH);
      // The cached filesystem might not be configured with the above write type.
      conf.setBoolean(ALLUXIO_HADOOP_FILESYSTEM_DISABLE_CACHE, true);
      return conf;
    }
  
    private ReadWriterUtils() {} // Prevent initialization
  }
  