org.hibernate.hql.internal.classic.OrderByParser Maven / Gradle / Ivy
/*
* 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
* statements applied by the authors. All third-party contributions are
* distributed under license by Red Hat Middleware LLC.
*
* This copyrighted material is made available to anyone wishing to use, modify,
* copy, or redistribute it subject to the terms and conditions of the GNU
* Lesser General Public License, as published by the Free Software Foundation.
*
* 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 Lesser General Public License
* for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this distribution; if not, write to:
* Free Software Foundation, Inc.
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*/
package org.hibernate.hql.internal.classic;
import org.hibernate.QueryException;
import org.hibernate.internal.util.StringHelper;
/**
* Parses the ORDER BY clause of a query
*/
public class OrderByParser implements Parser {
// 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 ORDER 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.appendOrderByToken( pathExpressionParser.getWhereColumn() );
pathExpressionParser.addAssociation( q );
}
else if ( token.startsWith( ParserHelper.HQL_VARIABLE_PREFIX ) ) { //named query parameter
q.addNamedParameter( token.substring( 1 ) );
q.appendOrderByToken( "?" );
}
else {
q.appendOrderByToken( token );
}
}
public void start(QueryTranslatorImpl q) throws QueryException {
}
public void end(QueryTranslatorImpl q) throws QueryException {
}
}