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JDBC Type 4 driver for MySQL.
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/*
 * Copyright (c) 2019, 2024, 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 designed to work with certain software 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 either included with the program or referenced in the documentation.
 *
 * 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 com.mysql.cj.MysqlxSession;
import com.mysql.cj.conf.PropertySet;
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.StatementExecuteOkBuilder;
import com.mysql.cj.protocol.x.XProtocol;
import com.mysql.cj.protocol.x.XProtocolRowInputStream;
import com.mysql.cj.result.DefaultColumnDefinition;
import com.mysql.cj.result.Field;
import com.mysql.cj.result.Row;
import com.mysql.cj.result.RowList;

/**
 * Result builder producing a streaming {@link DocResult} instance.
 */
public class StreamingDocResultBuilder implements ResultBuilder {

    private ArrayList fields = new ArrayList<>();
    private ColumnDefinition metadata;
    private RowList rowList = null;

    PropertySet pset;
    XProtocol protocol;
    private StatementExecuteOkBuilder statementExecuteOkBuilder = new StatementExecuteOkBuilder();

    public StreamingDocResultBuilder(MysqlxSession sess) {
        this.pset = sess.getPropertySet();
        this.protocol = sess.getProtocol();
    }

    @Override
    public boolean addProtocolEntity(ProtocolEntity entity) {
        if (entity instanceof Field) {
            this.fields.add((Field) entity);
            return false;

        } else if (entity instanceof Notice) {
            this.statementExecuteOkBuilder.addProtocolEntity(entity);
            return false;
        }

        if (this.metadata == null) {
            this.metadata = new DefaultColumnDefinition(this.fields.toArray(new Field[] {}));
        }

        this.rowList = entity instanceof Row ? new XProtocolRowInputStream(this.metadata, (Row) entity, this.protocol, n -> {
            this.statementExecuteOkBuilder.addProtocolEntity(n);
        }) : new XProtocolRowInputStream(this.metadata, this.protocol, n -> {
            this.statementExecuteOkBuilder.addProtocolEntity(n);
        });

        return true;
    }

    @Override
    public DocResult build() {
        return new DocResultImpl(this.rowList, () -> this.protocol.readQueryResult(this.statementExecuteOkBuilder), this.pset);
    }

}