hadoop-tools/hadoop-azure/src/main/java/org/apache/hadoop/fs/azure/BlobMaterialization.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.hadoop.fs.azure;

import org.apache.hadoop.classification.InterfaceAudience;

/**
 * Indicates whether there are actual blobs indicating the existence of
 * directories or whether we're inferring their existence from them having files
 * in there.
 */
@InterfaceAudience.Private
enum BlobMaterialization {
  /**
   * Indicates a directory that isn't backed by an actual blob, but its
   * existence is implied by the fact that there are files in there. For
   * example, if the blob /a/b exists then it implies the existence of the /a
   * directory if there's no /a blob indicating it.
   */
  Implicit,
  /**
   * Indicates that the directory is backed by an actual blob that has the
   * isFolder metadata on it.
   */
  Explicit,
}