/*
* Hibernate, Relational Persistence for Idiomatic Java
*
* License: GNU Lesser General Public License (LGPL), version 2.1 or later.
* See the lgpl.txt file in the root directory or <http://www.gnu.org/licenses/lgpl-2.1.html>.
*/
package org.hibernate.hql.internal.classic;
import org.hibernate.QueryException;
import org.hibernate.internal.util.StringHelper;
/**
* Parses the GROUP BY clause of an aggregate query
*/
public class GroupByParser implements Parser {
//this is basically a copy/paste of OrderByParser ... might be worth refactoring
// This uses a PathExpressionParser but notice that compound paths are not valid,
// only bare names and simple paths:
// SELECT p FROM p IN CLASS eg.Person GROUP BY p.Name, p.Address, p
// The reason for this is SQL doesn't let you sort by an expression you are
// not returning in the result set.
private final PathExpressionParser pathExpressionParser;
{
pathExpressionParser = new PathExpressionParser();
pathExpressionParser.setUseThetaStyleJoin( true ); //TODO: would be nice to use false, but issues with MS SQL
}
public void token(String token, QueryTranslatorImpl q) throws QueryException {
if ( q.isName( StringHelper.root( token ) ) ) {
ParserHelper.parse( pathExpressionParser, q.unalias( token ), ParserHelper.PATH_SEPARATORS, q );
q.appendGroupByToken( pathExpressionParser.getWhereColumn() );
pathExpressionParser.addAssociation( q );
}
else {
q.appendGroupByToken( token );
}
}
public void start(QueryTranslatorImpl q) throws QueryException {
}
public void end(QueryTranslatorImpl q) throws QueryException {
}
}