/******************************************************************************* | |
* Copyright (c) 2006, 2013 Oracle and/or its affiliates. All rights reserved. | |
* This program and the accompanying materials are made available under the | |
* terms of the Eclipse Public License v1.0 and Eclipse Distribution License v. 1.0 | |
* which accompanies this distribution. | |
* The Eclipse Public License is available at http://www.eclipse.org/legal/epl-v10.html | |
* and the Eclipse Distribution License is available at | |
* http://www.eclipse.org/org/documents/edl-v10.php. | |
* | |
* Contributors: | |
* Oracle - initial API and implementation | |
* | |
******************************************************************************/ | |
package org.eclipse.persistence.jpa.jpql.parser; | |
/** | |
* The query BNF for the order by item expression. | |
* | |
* <div nowrap><b>BNF:</b> <code>orderby_item ::= state_field_path_expression | result_variable [ ASC | DESC ]</code><p> | |
* | |
* @version 2.4 | |
* @since 2.3 | |
* @author Pascal Filion | |
*/ | |
@SuppressWarnings("nls") | |
public final class OrderByItemBNF extends JPQLQueryBNF { | |
/** | |
* The unique identifier of this BNF rule. | |
*/ | |
public static final String ID = "orderby_item"; | |
/** | |
* Creates a new <code>OrderByItemBNF</code>. | |
*/ | |
public OrderByItemBNF() { | |
super(ID); | |
} | |
/** | |
* {@inheritDoc} | |
*/ | |
@Override | |
protected void initialize() { | |
super.initialize(); | |
// Technically, this BNF does not support collection but it's parent | |
// orderby_clause does. But this BNF is used by OrderByClause directly | |
// to parse the query so the flag has to be turned on here | |
setHandleCollection(true); | |
setHandleAggregate(true); | |
setFallbackBNFId(ID); | |
setFallbackExpressionFactoryId(OrderByItemFactory.ID); | |
} | |
} |