/*
 * Hibernate, Relational Persistence for Idiomatic Java
 *
 * Copyright (c) 2008, Red Hat Middleware LLC or third-party contributors as
 * indicated by the @author tags or express copyright attribution
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 * You should have received a copy of the GNU Lesser General Public License
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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
/** * 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 { } }