content: /*
   * Licensed to 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
   * to 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 to 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 com.aliyun.odps.table.read;
  
  import com.aliyun.odps.table.configuration.ReaderOptions;
  import com.aliyun.odps.table.metrics.Metrics;
  import com.aliyun.odps.table.read.split.InputSplit;
  
  import java.io.Closeable;
  import java.io.IOException;
  
  /**
   * A split reader returned by {@link TableBatchReadSession#createRecordReader(InputSplit, ReaderOptions)}
   * or {@link TableBatchReadSession#createArrowReader(InputSplit, ReaderOptions)}
   * It's responsible for outputting data for an input split.
   */
  public interface SplitReader<T> extends Closeable {
  
      /**
       * Proceed to next record, returns false if there is no more records.
       *
       * @throws IOException if failure happens during network IO.
       */
      boolean hasNext() throws IOException;
  
      /**
       * Return the current record. This method should return same value until `hasNext` is called.
       */
      T get();
  
      /**
       * Returns metrics for this reader
       */
      default Metrics currentMetricsValues() {
          return new Metrics();
      }
  
  }
  