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   *  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
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  package org.apache.cayenne;
  
  import java.util.ArrayList;
  import java.util.Iterator;
  import java.util.List;
  
  /**
   * Defines API of a batch iterator over the ResultIterator returned as a result of
   * Select queries execution. Usually a ResultBatchIterator is supported by an open
   * java.sql.ResultSet, therefore ResultBatchIterator must be explicitly closed when
   * the user is done working with them.
   *
   * @since 4.0
   */
  public class ResultBatchIterator<T> implements Iterable<List<T>>, Iterator<List<T>>, AutoCloseable {
  
      private final ResultIterator<T> delegate;
      private final int size;
  
      public ResultBatchIterator(ResultIterator<T> delegate, int size) {
          this.delegate = delegate;
          this.size = size;
      }
  
      @Override
      public Iterator<List<T>> iterator() {
          return this;
      }
  
      @Override
      public boolean hasNext() {
          return delegate.hasNextRow();
      }
  
      @Override
      public List<T> next() {
          List<T> objects = new ArrayList<>(size);
  
          for (int i = 0; i < size && hasNext(); i++) {
              objects.add((T) delegate.nextRow());
          }
  
          return objects;
      }
  
      @Override
      public void remove() {
          throw new UnsupportedOperationException("Remove not supported.");
      }
  
      @Override
      public void close() {
          delegate.close();
      }
  
      public int getBatchSize() {
          return size;
      }
  }
  