ceph/src/rocksdb/java/src/main/java/org/rocksdb/ColumnFamilyMetaData.java

   1 // Copyright (c) 2011-present, Facebook, Inc.  All rights reserved.
   2 //  This source code is licensed under both the GPLv2 (found in the
   3 //  COPYING file in the root directory) and Apache 2.0 License
   4 //  (found in the LICENSE.Apache file in the root directory).
   5
   6 package org.rocksdb;
   7
   8 import java.util.Arrays;
   9 import java.util.List;
  10
  11 /**
  12  * The metadata that describes a column family.
  13  */
  14 public class ColumnFamilyMetaData {
  15   private final long size;
  16   private final long fileCount;
  17   private final byte[] name;
  18   private final LevelMetaData[] levels;
  19
  20   /**
  21    * Called from JNI C++
  22    */
  23   private ColumnFamilyMetaData(
  24       final long size,
  25       final long fileCount,
  26       final byte[] name,
  27       final LevelMetaData[] levels) {
  28     this.size = size;
  29     this.fileCount = fileCount;
  30     this.name = name;
  31     this.levels = levels;
  32   }
  33
  34   /**
  35    * The size of this column family in bytes, which is equal to the sum of
  36    * the file size of its {@link #levels()}.
  37    *
  38    * @return the size of this column family
  39    */
  40   public long size() {
  41     return size;
  42   }
  43
  44   /**
  45    * The number of files in this column family.
  46    *
  47    * @return the number of files
  48    */
  49   public long fileCount() {
  50     return fileCount;
  51   }
  52
  53   /**
  54    * The name of the column family.
  55    *
  56    * @return the name
  57    */
  58   public byte[] name() {
  59     return name;
  60   }
  61
  62   /**
  63    * The metadata of all levels in this column family.
  64    *
  65    * @return the levels metadata
  66    */
  67   public List<LevelMetaData> levels() {
  68     return Arrays.asList(levels);
  69   }
  70 }