content: /*
   * Copyright (c) 2019, 2021, 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.xdevapi;
  
  import java.util.ArrayList;
  import java.util.List;
  import java.util.TimeZone;
  import java.util.concurrent.atomic.AtomicBoolean;
  import java.util.function.Supplier;
  
  import com.mysql.cj.MysqlxSession;
  import com.mysql.cj.conf.PropertySet;
  import com.mysql.cj.exceptions.CJCommunicationsException;
  import com.mysql.cj.protocol.ColumnDefinition;
  import com.mysql.cj.protocol.ProtocolEntity;
  import com.mysql.cj.protocol.ResultBuilder;
  import com.mysql.cj.protocol.x.Notice;
  import com.mysql.cj.protocol.x.StatementExecuteOk;
  import com.mysql.cj.protocol.x.StatementExecuteOkBuilder;
  import com.mysql.cj.protocol.x.XProtocol;
  import com.mysql.cj.protocol.x.XProtocolRowInputStream;
  import com.mysql.cj.result.Field;
  
  /**
   * Result builder producing a streaming {@link SqlResult} instance.
   */
  public class StreamingSqlResultBuilder implements ResultBuilder<SqlResult> {
      TimeZone defaultTimeZone;
      PropertySet pset;
      XProtocol protocol;
  
      StatementExecuteOkBuilder statementExecuteOkBuilder = new StatementExecuteOkBuilder();
      boolean isRowResult = false;
      ProtocolEntity lastEntity = null;
  
      List<SqlSingleResult> resultSets = new ArrayList<>();
      private SqlResult result;
  
      public StreamingSqlResultBuilder(MysqlxSession sess) {
          this.defaultTimeZone = sess.getServerSession().getDefaultTimeZone();
          this.pset = sess.getPropertySet();
          this.protocol = sess.getProtocol();
      }
  
      @Override
      public boolean addProtocolEntity(ProtocolEntity entity) {
  
          if (entity instanceof Notice) {
              this.statementExecuteOkBuilder.addProtocolEntity(entity);
          } else {
              this.lastEntity = entity;
          }
  
          AtomicBoolean readLastResult = new AtomicBoolean(false);
          Supplier<ProtocolEntity> okReader = () -> {
              if (readLastResult.get()) {
                  throw new CJCommunicationsException("Invalid state attempting to read ok packet");
              }
              if (this.protocol.hasMoreResults()) {
                  StatementExecuteOk res = this.statementExecuteOkBuilder.build();
                  this.statementExecuteOkBuilder = new StatementExecuteOkBuilder();
                  return res;
              }
              readLastResult.set(true);
              return this.protocol.readQueryResult(this.statementExecuteOkBuilder);
          };
          Supplier<SqlResult> resultStream = () -> {
              if (readLastResult.get()) {
                  return null;
              } else if (this.lastEntity != null && this.lastEntity instanceof Field || this.protocol.isSqlResultPending()) {
                  ColumnDefinition cd;
                  if (this.lastEntity != null && this.lastEntity instanceof Field) {
                      cd = this.protocol.readMetadata((Field) this.lastEntity, (n) -> {
                          this.statementExecuteOkBuilder.addProtocolEntity(n);
                      });
                      this.lastEntity = null;
                  } else {
                      cd = this.protocol.readMetadata(this.statementExecuteOkBuilder::addProtocolEntity);
                  }
                  return new SqlSingleResult(cd, this.protocol.getServerSession().getDefaultTimeZone(), new XProtocolRowInputStream(cd, this.protocol, (n) -> {
                      this.statementExecuteOkBuilder.addProtocolEntity(n);
                  }), okReader, this.pset);
              } else {
                  readLastResult.set(true);
                  SqlResultBuilder rb = new SqlResultBuilder(this.defaultTimeZone, this.pset);
                  rb.addProtocolEntity(entity);
                  return this.protocol.readQueryResult(rb);
              }
          };
          this.result = new SqlMultiResult(resultStream);
  
          return true;
      }
  
      @Override
      public SqlResult build() {
          return this.result;
      }
  }
  