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.arrow.readers;
  
  import com.aliyun.odps.table.arrow.ArrowReader;
  import org.apache.arrow.memory.BufferAllocator;
  import org.apache.arrow.vector.VectorSchemaRoot;
  import org.apache.arrow.vector.compression.CompressionCodec;
  import org.apache.arrow.vector.ipc.ArrowStreamReader;
  
  import java.io.IOException;
  import java.io.InputStream;
  public class ArrowBatchReusedReader implements ArrowReader {
  
      private final ArrowStreamReader arrowReader;
      private VectorSchemaRoot currentBatch;
  
      public ArrowBatchReusedReader(InputStream is,
                                    BufferAllocator allocator) {
          this.arrowReader = new ArrowStreamReader(is, allocator);
          this.currentBatch = null;
      }
  
      public ArrowBatchReusedReader(InputStream is,
                                    BufferAllocator allocator,
                                    CompressionCodec.Factory compressionFactory) {
          this.arrowReader = new ArrowStreamReader(is, allocator, compressionFactory);
          this.currentBatch = null;
      }
  
      @Override
      public VectorSchemaRoot getCurrentValue() {
          return currentBatch;
      }
  
      @Override
      public boolean nextBatch() throws IOException {
          boolean hasNext = arrowReader.loadNextBatch();
          if (hasNext) {
              currentBatch = arrowReader.getVectorSchemaRoot();
          } else {
              currentBatch = null;
          }
          return hasNext;
      }
  
      @Override
      public void close() throws IOException {
          arrowReader.close();
      }
  
      @Override
      public long bytesRead() {
          return arrowReader.bytesRead();
      }
  }
  