ceph/src/rocksdb/java/jmh/src/main/java/org/rocksdb/util/KVUtils.java

   1 /**
   2  * Copyright (c) 2011-present, Facebook, Inc.  All rights reserved.
   3  *  This source code is licensed under both the GPLv2 (found in the
   4  *  COPYING file in the root directory) and Apache 2.0 License
   5  *  (found in the LICENSE.Apache file in the root directory).
   6  */
   7 package org.rocksdb.util;
   8
   9 import java.util.ArrayList;
  10 import java.util.List;
  11
  12 import static java.nio.charset.StandardCharsets.UTF_8;
  13
  14 public final class KVUtils {
  15
  16   /**
  17    * Get a byte array from a string.
  18    *
  19    * Assumes UTF-8 encoding
  20    *
  21    * @param string the string
  22    *
  23    * @return the bytes.
  24    */
  25   public static byte[] ba(final String string) {
  26     return string.getBytes(UTF_8);
  27   }
  28
  29   /**
  30    * Get a string from a byte array.
  31    *
  32    * Assumes UTF-8 encoding
  33    *
  34    * @param bytes the bytes
  35    *
  36    * @return the string.
  37    */
  38   public static String str(final byte[] bytes) {
  39     return new String(bytes, UTF_8);
  40   }
  41
  42   /**
  43    * Get a list of keys where the keys are named key1..key1+N
  44    * in the range of {@code from} to {@code to} i.e. keyFrom..keyTo.
  45    *
  46    * @param from the first key
  47    * @param to the last key
  48    *
  49    * @return the array of keys
  50    */
  51   public static List<byte[]> keys(final int from, final int to) {
  52     final List<byte[]> keys = new ArrayList<>(to - from);
  53     for (int i = from; i < to; i++) {
  54       keys.add(ba("key" + i));
  55     }
  56     return keys;
  57   }
  58 }