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.jdbc;
  
  import java.sql.ResultSet;
  import java.sql.SQLException;
  
  import com.aliyun.odps.data.Record;
  
  public class OdpsSessionForwardResultSet extends OdpsResultSet implements ResultSet {
  
    private Object[] currentRow;
    com.aliyun.odps.data.ResultSet resultSet;
    private int fetchedRows = 0;
    // max row count can be read
    private int totalRows = Integer.MAX_VALUE;
    private boolean isClosed = false;
  
    private long startTime;
  
  
    OdpsSessionForwardResultSet(OdpsStatement stmt, OdpsResultSetMetaData meta,
                                com.aliyun.odps.data.ResultSet resultSet, long startTime)
        throws SQLException {
      super(stmt.getConnection(), stmt, meta);
  
      // maxRows take effect only if it > 0
      if (stmt.resultSetMaxRows > 0) {
        totalRows = stmt.resultSetMaxRows;
      }
  
      this.resultSet = resultSet;
      this.startTime = startTime;
    }
  
    protected void checkClosed() throws SQLException {
      if (isClosed) {
        throw new SQLException("The result set has been closed");
      }
    }
  
    @Override
    public int getRow() throws SQLException {
      checkClosed();
      return (int) fetchedRows;
    }
  
    @Override
    public int getType() throws SQLException {
      return ResultSet.TYPE_FORWARD_ONLY;
    }
  
    @Override
    public boolean isClosed() throws SQLException {
      return isClosed;
    }
  
    @Override
    public void close() throws SQLException {
      if (isClosed) {
        return;
      }
  
      isClosed = true;
      conn.log.debug("the result set has been closed");
    }
  
    @Override
    public boolean next() throws SQLException {
      checkClosed();
  
      if (fetchedRows == totalRows || !resultSet.hasNext()) {
        conn.log.info("It took me " + (System.currentTimeMillis() - startTime)
                      + " ms to fetch all records, count:" + fetchedRows);
        return false;
      }
      Record record = resultSet.next();
      int columns = record.getColumnCount();
      currentRow = new Object[columns];
      for (int i = 0; i < columns; i++) {
        currentRow[i] = record.get(i);
      }
      fetchedRows++;
      return true;
    }
  
    @Override
    protected Object[] rowAtCursor() throws SQLException {
      if (currentRow == null) {
        throw new SQLException("the row should be not-null, row=" + fetchedRows);
      }
  
      if (currentRow.length == 0) {
        throw new SQLException("the row should have more than 1 column , row=" + fetchedRows);
      }
  
      return currentRow;
    }
  }