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 org.apache.carbondata.processing.loading.row;
  
  import java.util.NoSuchElementException;
  
  import org.apache.carbondata.common.CarbonIterator;
  import org.apache.carbondata.core.datastore.row.CarbonRow;
  
  import org.apache.commons.lang.ArrayUtils;
  
  /**
   * Batch of rows.
   */
  public class CarbonRowBatch extends CarbonIterator<CarbonRow> {
  
    private CarbonRow[] rowBatch;
  
    private int size = 0;
  
    private int index = 0;
  
    public CarbonRowBatch(int batchSize) {
      this.rowBatch = new CarbonRow[batchSize];
    }
  
    public void addRow(CarbonRow carbonRow) {
      rowBatch[size++] = carbonRow;
    }
  
    public int getSize() {
      return size;
    }
  
    @Override
    public boolean hasNext() {
      return index < size;
    }
  
    @Override
    public CarbonRow next() throws NoSuchElementException {
      if (hasNext()) {
        return rowBatch[index++];
      }
      throw new NoSuchElementException("no more elements to iterate");
    }
  
    @Override
    public void remove() {
      rowBatch = (CarbonRow[]) ArrayUtils.remove(rowBatch, index - 1);
      --size;
      --index;
    }
  
    /**
     * set previous row, this can be used to set value for the RowBatch after iterating it. The
     * `index` here is `index-1` because after we iterate this value, the `index` has increased by 1.
     * @param row row
     */
    public void setPreviousRow(CarbonRow row) {
      if (index == 0) {
        throw new RuntimeException("Unable to set a row in RowBatch before index 0");
      }
      rowBatch[index - 1] = row;
    }
  
    /**
     * rewind to the head, this can be used for reuse the origin batch instead of generating a new one
     */
    public void rewind() {
      index = 0;
    }
  }
  