/******************************************************************************* | |
* Copyright (c) 1998, 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 from Oracle TopLink | |
******************************************************************************/ | |
package org.eclipse.persistence.internal.jpa.parsing; | |
import java.util.*; | |
import org.eclipse.persistence.queries.ReadAllQuery; | |
import org.eclipse.persistence.queries.ObjectLevelReadQuery; | |
/** | |
* INTERNAL | |
* <p><b>Purpose</b>: Represent an ORDER BY | |
* <p><b>Responsibilities</b>:<ul> | |
* <li> Generate the correct expression for an ORDER BY | |
* </ul> | |
* @author Jon Driscoll | |
* @since TopLink 5.0 | |
*/ | |
public class OrderByNode extends MajorNode { | |
List orderByItems = null; | |
/** | |
* Return a new OrderByNode. | |
*/ | |
public OrderByNode() { | |
super(); | |
} | |
/** | |
* INTERNAL | |
* Add the ordering expressions to the passed query | |
*/ | |
public void addOrderingToQuery(ObjectLevelReadQuery theQuery, GenerationContext context) { | |
if (theQuery.isReadAllQuery()) { | |
Iterator iter = getOrderByItems().iterator(); | |
while (iter.hasNext()) { | |
Node nextNode = (Node)iter.next(); | |
((ReadAllQuery)theQuery).addOrdering(nextNode.generateExpression(context)); | |
} | |
} | |
} | |
/** | |
* INTERNAL | |
* Validate node. | |
*/ | |
public void validate(ParseTreeContext context, SelectNode selectNode) { | |
for (Iterator i = orderByItems.iterator(); i.hasNext(); ) { | |
Node item = (Node)i.next(); | |
item.validate(context); | |
} | |
} | |
/** | |
* INTERNAL | |
* Return the order by statements | |
*/ | |
public List getOrderByItems() { | |
if (orderByItems == null) { | |
setOrderByItems(new Vector()); | |
} | |
return orderByItems; | |
} | |
/** | |
* INTERNAL | |
* Set the order by statements | |
*/ | |
public void setOrderByItems(List newItems) { | |
orderByItems = newItems; | |
} | |
} |