@org.apache.thrift.annotation.Nullable
  public java.lang.Object getFieldValue(_Fields field) {
    switch (field) {
    case REGION_ID:
      return getRegionId();

    case TABLE_NAME:
      return getTableName();

    case START_KEY:
      return getStartKey();

    case END_KEY:
      return getEndKey();

    case OFFLINE:
      return isOffline();

    case SPLIT:
      return isSplit();

    case REPLICA_ID:
      return getReplicaId();

    }
    throw new java.lang.IllegalStateException();
  }
Returns true if field replicaId is set (has been assigned a value) and false otherwise
hbase-thrift/src/main/java/org/apache/hadoop/hbase/thrift2/generated/THRegionInfo.java