public void setFieldValue(_Fields field, @org.apache.thrift.annotation.Nullable java.lang.Object value) {
    switch (field) {
    case HOST_NAME:
      if (value == null) {
        unsetHostName();
      } else {
        setHostName((java.lang.String)value);
      }
      break;

    case PORT:
      if (value == null) {
        unsetPort();
      } else {
        setPort((java.lang.Integer)value);
      }
      break;

    case START_CODE:
      if (value == null) {
        unsetStartCode();
      } else {
        setStartCode((java.lang.Long)value);
      }
      break;

    }
  }
Returns true if field startCode is set (has been assigned a value) and false otherwise
hbase-thrift/src/main/java/org/apache/hadoop/hbase/thrift2/generated/TServerName.java