content: /*
   * Copyright <2019> Amazon.com, Inc. or its affiliates. All Rights Reserved.
   *
   * Licensed under the Apache License, Version 2.0 (the "License").
   * You may not use this file except in compliance with the License.
   * A copy of the License is located at
   *
   *     http://www.apache.org/licenses/LICENSE-2.0
   *
   * or in the "license" file accompanying this file. This file 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.amazon.opendistroforelasticsearch.jdbc;
  
  import com.amazon.opendistroforelasticsearch.jdbc.internal.exceptions.ObjectClosedException;
  import com.amazon.opendistroforelasticsearch.jdbc.logging.LoggingSource;
  import com.amazon.opendistroforelasticsearch.jdbc.logging.Logger;
  import com.amazon.opendistroforelasticsearch.jdbc.protocol.JdbcQueryRequest;
  import com.amazon.opendistroforelasticsearch.jdbc.internal.JdbcWrapper;
  import com.amazon.opendistroforelasticsearch.jdbc.protocol.exceptions.InternalServerErrorException;
  import com.amazon.opendistroforelasticsearch.jdbc.protocol.QueryResponse;
  import com.amazon.opendistroforelasticsearch.jdbc.protocol.exceptions.ResponseException;
  
  import java.io.IOException;
  import java.sql.Connection;
  import java.sql.ResultSet;
  import java.sql.SQLException;
  import java.sql.SQLFeatureNotSupportedException;
  import java.sql.SQLNonTransientException;
  import java.sql.SQLWarning;
  import java.sql.Statement;
  
  public class StatementImpl implements Statement, JdbcWrapper, LoggingSource {
  
      protected ConnectionImpl connection;
      protected boolean open = false;
      protected int fetchSize;
      protected ResultSetImpl resultSet;
      protected Logger log;
      private boolean closeOnCompletion;
  
      public StatementImpl(ConnectionImpl connection, Logger log) {
          this.connection = connection;
          this.open = true;
          this.fetchSize = connection.getFetchSize();
          this.log = log;
      }
  
      @Override
      public ResultSet executeQuery(String sql) throws SQLException {
          log.debug(()-> logEntry("executeQuery (%s)", sql));
          ResultSet rs = executeQueryX(sql, fetchSize);
          log.debug(()-> logExit("executeQuery", rs));
          return rs;
      }
  
      protected ResultSet executeQueryX(String sql, int fetchSize) throws SQLException {
          JdbcQueryRequest jdbcQueryRequest = new JdbcQueryRequest(sql, fetchSize);
          return executeQueryRequest(jdbcQueryRequest);
      }
  
      protected ResultSet executeQueryRequest(JdbcQueryRequest jdbcQueryRequest) throws SQLException {
  
          // JDBC Spec: A ResultSet object is automatically closed when the Statement
          // object that generated it is closed, re-executed, or used to retrieve the
          // next result from a sequence of multiple results.
          closeResultSet(false);
  
          try {
              QueryResponse queryResponse = connection.getProtocol().execute(jdbcQueryRequest);
  
              if (queryResponse.getError() != null) {
                  throw new InternalServerErrorException(
                          queryResponse.getError().getReason(),
                          queryResponse.getError().getType(),
                          queryResponse.getError().getDetails());
              }
  
              resultSet = buildResultSet(queryResponse);
  
          } catch (ResponseException | IOException ex) {
              logAndThrowSQLException(log, new SQLException("Error executing query", ex));
          }
          return resultSet;
      }
  
      protected ResultSetImpl buildResultSet(QueryResponse queryResponse) throws SQLException {
          return new ResultSetImpl(this, queryResponse, log);
      }
  
      @Override
      public int executeUpdate(String sql) throws SQLException {
          checkOpen();
          throw new SQLFeatureNotSupportedException("Updates are not supported.");
      }
  
      @Override
      public void close() throws SQLException {
          log.debug(()->logEntry("close ()"));
          open = false;
          log.debug(()->logExit("close"));
      }
  
      private void closeX() throws SQLException {
          open = false;
      }
  
      @Override
      public int getMaxFieldSize() throws SQLException {
          return 0;
      }
  
      @Override
      public void setMaxFieldSize(int max) throws SQLException {
  
      }
  
      @Override
      public int getMaxRows() throws SQLException {
          return 0;
      }
  
      @Override
      public void setMaxRows(int max) throws SQLException {
  
      }
  
      @Override
      public void setEscapeProcessing(boolean enable) throws SQLException {
          checkOpen();
      }
  
      @Override
      public int getQueryTimeout() throws SQLException {
          return 0;
      }
  
      @Override
      public void setQueryTimeout(int seconds) throws SQLException {
          // no-op
      }
  
      @Override
      public void cancel() throws SQLException {
          throw new SQLFeatureNotSupportedException("cancel not supported");
      }
  
      @Override
      public SQLWarning getWarnings() throws SQLException {
          return null;
      }
  
      @Override
      public void clearWarnings() throws SQLException {
  
      }
  
      @Override
      public void setCursorName(String name) throws SQLException {
          checkOpen();
          // no-op
      }
  
      @Override
      public boolean execute(String sql) throws SQLException {
          log.debug(()->logEntry("execute (%s)", sql));
          checkOpen();
          executeQueryX(sql, fetchSize);
          log.debug(() -> logExit("execute", true));
          return true;
      }
  
      @Override
      public ResultSet getResultSet() throws SQLException {
          log.debug(() -> logEntry("getResultSet ()"));
          checkOpen();
          log.debug(() -> logExit("getResultSet", resultSet));
          return resultSet;
      }
  
      @Override
      public int getUpdateCount() throws SQLException {
          checkOpen();
          return -1;
      }
  
      @Override
      public boolean getMoreResults() throws SQLException {
          checkOpen();
          closeResultSet(true);
          return false;
      }
  
      @Override
      public void setFetchDirection(int direction) throws SQLException {
  
      }
  
      @Override
      public int getFetchDirection() throws SQLException {
          return 0;
      }
  
      @Override
      public void setFetchSize(int rows) throws SQLException {
          fetchSize = rows;
      }
  
      @Override
      public int getFetchSize() throws SQLException {
          return fetchSize;
      }
  
      @Override
      public int getResultSetConcurrency() throws SQLException {
          return ResultSet.CONCUR_READ_ONLY;
      }
  
      @Override
      public int getResultSetType() throws SQLException {
          return ResultSet.TYPE_FORWARD_ONLY;
      }
  
      @Override
      public void addBatch(String sql) throws SQLException {
          throw new SQLFeatureNotSupportedException("Batch execution is not supported");
      }
  
      @Override
      public void clearBatch() throws SQLException {
          throw new SQLFeatureNotSupportedException("Batch execution is not supported");
      }
  
      @Override
      public int[] executeBatch() throws SQLException {
          throw new SQLFeatureNotSupportedException("Batch execution is not supported");
      }
  
      @Override
      public Connection getConnection() throws SQLException {
          return connection;
      }
  
      @Override
      public boolean getMoreResults(int current) throws SQLException {
          return false;
      }
  
      @Override
      public ResultSet getGeneratedKeys() throws SQLException {
          return null;
      }
  
      @Override
      public int executeUpdate(String sql, int autoGeneratedKeys) throws SQLException {
          throw updatesNotSupportedException();
      }
  
      @Override
      public int executeUpdate(String sql, int[] columnIndexes) throws SQLException {
          throw updatesNotSupportedException();
      }
  
      @Override
      public int executeUpdate(String sql, String[] columnNames) throws SQLException {
          throw updatesNotSupportedException();
      }
  
      @Override
      public boolean execute(String sql, int autoGeneratedKeys) throws SQLException {
          log.debug(()->logEntry("execute (%s, %d)", sql, autoGeneratedKeys));
          checkOpen();
          if (autoGeneratedKeys != Statement.NO_GENERATED_KEYS) {
              throw new SQLNonTransientException("Auto generated keys are not supported");
          }
          executeQueryX(sql, fetchSize);
          log.debug(() -> logExit("execute", true));
          return true;
      }
  
      @Override
      public boolean execute(String sql, int[] columnIndexes) throws SQLException {
          throw new SQLNonTransientException("Auto generated keys are not supported");
      }
  
      @Override
      public boolean execute(String sql, String[] columnNames) throws SQLException {
          throw new SQLNonTransientException("Auto generated keys are not supported");
      }
  
      @Override
      public int getResultSetHoldability() throws SQLException {
          return ResultSet.HOLD_CURSORS_OVER_COMMIT;
      }
  
      @Override
      public boolean isClosed() throws SQLException {
          return isClosedX();
      }
  
      protected boolean isClosedX() throws SQLException {
          return !open;
      }
  
      @Override
      public void setPoolable(boolean poolable) throws SQLException {
          checkOpen();
          // no-op
      }
  
      @Override
      public boolean isPoolable() throws SQLException {
          return false;
      }
  
      @Override
      public void closeOnCompletion() throws SQLException {
          closeOnCompletion = true;
      }
  
      @Override
      public boolean isCloseOnCompletion() throws SQLException {
          return closeOnCompletion;
      }
  
      protected void checkOpen() throws SQLException {
          if (isClosedX()) {
              throw new ObjectClosedException("Statement closed.");
          }
      }
  
      protected void closeResultSet(boolean closeStatement) throws SQLException {
          if (resultSet != null) {
              resultSet.closeX(closeStatement);
          }
      }
  
      void resultSetClosed(ResultSet rs, boolean closeStatement) throws SQLException {
          if (closeOnCompletion && closeStatement) {
              log.debug(() -> logMessage("Child ResultSet closed and closeOnCompletion is enabled. Closing statement."));
              closeX();
          }
      }
  
      private SQLException updatesNotSupportedException() {
          return new SQLFeatureNotSupportedException("Updates are not supported");
      }
  }
  