content: /*
   * Copyright (c) 2015, 2020, Oracle and/or its affiliates.
   *
   * This program is free software; you can redistribute it and/or modify it under
   * the terms of the GNU General Public License, version 2.0, as published by the
   * Free Software Foundation.
   *
   * This program is also distributed with certain software (including but not
   * limited to OpenSSL) that is licensed under separate terms, as designated in a
   * particular file or component or in included license documentation. The
   * authors of MySQL hereby grant you an additional permission to link the
   * program and your derivative works with the separately licensed software that
   * they have included with MySQL.
   *
   * Without limiting anything contained in the foregoing, this file, which is
   * part of MySQL Connector/J, is also subject to the Universal FOSS Exception,
   * version 1.0, a copy of which can be found at
   * http://oss.oracle.com/licenses/universal-foss-exception.
   *
   * This program is distributed in the hope that it will be useful, but WITHOUT
   * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
   * FOR A PARTICULAR PURPOSE. See the GNU General Public License, version 2.0,
   * for more details.
   *
   * You should have received a copy of the GNU General Public License along with
   * this program; if not, write to the Free Software Foundation, Inc.,
   * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301  USA
   */
  
  package com.mysql.cj.result;
  
  import java.util.Iterator;
  import java.util.List;
  import java.util.NoSuchElementException;
  import java.util.Spliterators;
  import java.util.stream.Collectors;
  import java.util.stream.StreamSupport;
  
  public class BufferedRowList implements RowList {
      private List<Row> rowList;
      private int position = -1;
  
      public BufferedRowList(List<Row> rowList) {
          this.rowList = rowList;
      }
  
      /**
       * Create a new instance by filling the internal buffer by draining the row stream.
       * 
       * @param ris
       *            {@link Row}s iterator
       */
      public BufferedRowList(Iterator<Row> ris) {
          this.rowList = StreamSupport.stream(Spliterators.spliteratorUnknownSize(ris, 0), false).collect(Collectors.toList());
      }
  
      public Row next() {
          if (this.position + 1 == this.rowList.size()) {
              throw new NoSuchElementException("Can't next() when position=" + this.position + " and size=" + this.rowList.size());
          }
          return this.rowList.get(++this.position);
      }
  
      public Row previous() {
          if (this.position < 1) {
              throw new NoSuchElementException("Can't previous() when position=" + this.position);
          }
          return this.rowList.get(--this.position);
      }
  
      public Row get(int n) {
          if (n < 0 || n >= this.rowList.size()) {
              throw new NoSuchElementException("Can't get(" + n + ") when size=" + this.rowList.size());
          }
          return this.rowList.get(n);
      }
  
      public int getPosition() {
          return this.position;
      }
  
      public int size() {
          return this.rowList.size();
      }
  
      public boolean hasNext() {
          return this.position + 1 < this.rowList.size();
      }
  }
  