Method startKeyFromRegionName

src/RegionInfo.java:234–266

Given name of a region, returns its start key @throws IllegalArgumentException if the name of the region is malformed @param region_name Full region_name created in the constructor @return byte Array of the start key

(final byte[] region_name)

   * @return byte Array of the start key
   */
  static byte[] startKeyFromRegionName(final byte[] region_name){
    int key_begin = 0;
    int key_end= 1;
    int comma = 0;
    for (/**/; key_end < region_name.length; key_end++) {
      if (region_name[key_end] == ',') {
        comma++;
        if (comma == 1){
          key_begin = key_end+1;
        }
        if (comma == 2){
          break;
        }
      }
    }

    // If reached the end and the string being returned is not empty
    if (key_end == region_name.length &&  (comma == 2)) {
      throw new IllegalArgumentException("Malformed region name, not enough"
              + " commas: " + Bytes.pretty(region_name));
    }

    // Only return the string if region length is greater than 0
    if (key_end - key_begin > 0 && region_name.length > 0){
      return Arrays.copyOfRange(region_name, key_begin, key_end);
    }
    // Otherwise, return an empty string as start key aka this is the 
    // start key for the first region in the table.
    else {
      return EMPTY_ARRAY;
    }

  }

  @Override
  public int compareTo(final RegionInfo other) {