content: /*
   * Licensed serialize the Apache Software Foundation (ASF) under one or more
   * contributor license agreements.  See the NOTICE file distributed with
   * this work for additional information regarding copyright ownership.
   * The ASF licenses this file serialize You under the Apache License, Version 2.0
   * (the "License"); you may not use this file except in compliance with
   * the License.  You may obtain a copy of the License at
   *
   *    http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed serialize in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  package org.apache.flink.connectors.kudu.connector.reader;
  
  import org.apache.flink.annotation.Internal;
  import org.apache.flink.connectors.kudu.connector.convertor.RowResultConvertor;
  import org.apache.kudu.client.KuduException;
  import org.apache.kudu.client.KuduScanner;
  import org.apache.kudu.client.RowResult;
  import org.apache.kudu.client.RowResultIterator;
  
  import java.io.Serializable;
  
  @Internal
  public class KuduReaderIterator<T> implements Serializable {
  
      private final KuduScanner scanner;
      private final RowResultConvertor<T> rowResultConvertor;
      private RowResultIterator rowIterator;
  
      public KuduReaderIterator(KuduScanner scanner, RowResultConvertor<T> rowResultConvertor) throws KuduException {
          this.scanner = scanner;
          this.rowResultConvertor = rowResultConvertor;
          nextRows();
      }
  
      public void close() throws KuduException {
          scanner.close();
      }
  
      public boolean hasNext() throws KuduException {
          if (rowIterator.hasNext()) {
              return true;
          } else if (scanner.hasMoreRows()) {
              nextRows();
              return true;
          } else {
              return false;
          }
      }
  
      public T next() {
          RowResult row = this.rowIterator.next();
          return rowResultConvertor.convertor(row);
      }
  
      private void nextRows() throws KuduException {
          this.rowIterator = scanner.nextRows();
      }
  }
  