package adql.parser;
/*
* This file is part of ADQLLibrary.
*
* ADQLLibrary is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* ADQLLibrary 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 Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with ADQLLibrary. If not, see <http://www.gnu.org/licenses/>.
*
* Copyright 2016 - Astronomisches Rechen Institut (ARI)
*/
import adql.query.from.ADQLJoin;
import adql.query.from.CrossJoin;
import adql.query.from.FromContent;
import adql.query.from.InnerJoin;
import adql.query.from.OuterJoin;
import adql.query.from.SQLServer_InnerJoin;
import adql.query.from.SQLServer_OuterJoin;
import adql.query.from.OuterJoin.OuterType;
import adql.translator.SQLServerTranslator;
/**
* <p>Special extension of {@link ADQLQueryFactory} for MS SQL Server.</p>
*
* <p><b>Important:</b>
* This class is generally used when an ADQL translator for MS SQL Server is needed.
* See {@link SQLServerTranslator} for more details.
* </p>
*
* <p>
* The only difference with {@link ADQLQueryFactory} is the creation of an
* {@link ADQLJoin}. Instead of creating {@link InnerJoin} and {@link OuterJoin},
* {@link SQLServer_InnerJoin} and {@link SQLServer_OuterJoin} are respectively created.
* The only difference between these last classes and the first ones is in the processing
* of NATURAL JOINs and JOINs using the keyword USING.
* </p>
*
* @author Grégory Mantelet (ARI)
* @version 1.4 (03/2016)
* @since 1.4
*
* @see SQLServer_InnerJoin
* @see SQLServer_OuterJoin
* @see SQLServerTranslator
*/
public class SQLServer_ADQLQueryFactory extends ADQLQueryFactory {
public ADQLJoin createJoin(JoinType type, FromContent leftTable, FromContent rightTable) throws Exception{
switch(type){
case CROSS:
return new CrossJoin(leftTable, rightTable);
case INNER:
return new SQLServer_InnerJoin(leftTable, rightTable);
case OUTER_LEFT:
return new SQLServer_OuterJoin(leftTable, rightTable, OuterType.LEFT);
case OUTER_RIGHT:
return new SQLServer_OuterJoin(leftTable, rightTable, OuterType.RIGHT);
case OUTER_FULL:
return new SQLServer_OuterJoin(leftTable, rightTable, OuterType.FULL);
default:
throw new Exception("Unknown join type: " + type);
}
}
}