/******************************************************************************* | |
* 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 | |
******************************************************************************/ | |
/** | |
* INTERNAL | |
* <p><b>Purpose</b>: This node represents an ORDER BY item | |
* <p><b>Responsibilities</b>:<ul> | |
* <li> Generate the correct expression for ORDER BY | |
* </ul> | |
* @author Jon Driscoll | |
* @since OracleAS TopLink 10<i>g</i> (9.0.4) | |
*/ | |
package org.eclipse.persistence.internal.jpa.parsing; | |
import org.eclipse.persistence.exceptions.JPQLException; | |
import org.eclipse.persistence.expressions.Expression; | |
public class OrderByItemNode extends Node { | |
private SortDirectionNode direction = null; | |
private Object orderByItem = null; | |
private Node orderNode = null; | |
/** | |
* INTERNAL | |
* Validate node and calculate its type. | |
*/ | |
public void validate(ParseTreeContext context) { | |
TypeHelper typeHelper = context.getTypeHelper(); | |
if (orderNode == null){ | |
if (orderByItem instanceof Node){ | |
orderNode = (Node)orderByItem; | |
} else { | |
orderNode = context.pathForVariable((String)orderByItem); | |
if (orderNode == null){ | |
throw JPQLException.nonExistantOrderByAlias( | |
context.getQueryInfo(), getLine(), getColumn(), | |
(String)orderByItem); | |
} | |
} | |
} | |
if (orderNode != null) { | |
orderNode.validate(context); | |
Object type = orderNode.getType(); | |
setType(type); | |
if (!typeHelper.isOrderableType(type)) { | |
throw JPQLException.expectedOrderableOrderByItem( | |
context.getQueryInfo(), orderNode.getLine(), orderNode.getColumn(), | |
orderNode.getAsString(), typeHelper.getTypeName(type)); | |
} | |
} | |
} | |
/** */ | |
public Expression generateExpression(GenerationContext context) { | |
//BUG 3105651: Indicate to the VariableNodes in the subtree | |
//that they should check the SelectNode before resolving. | |
//If the variable involved is SELECTed, then we want an empty builder | |
//instead (with an empty constructor). | |
boolean oldCheckState = context.shouldCheckSelectNodeBeforeResolving(); | |
((SelectGenerationContext)context).checkSelectNodeBeforeResolving(true); | |
Expression orderByExpression = null; | |
if (orderByItem instanceof Node){ | |
orderNode = (Node)orderByItem; | |
orderByExpression = orderNode.generateExpression(context); | |
} else { | |
orderByExpression = context.expressionFor((String)orderByItem); | |
if (orderByExpression == null){ | |
return null; | |
} | |
} | |
orderByExpression = getDirection().addToExpression(orderByExpression, context); | |
((SelectGenerationContext)context).checkSelectNodeBeforeResolving(oldCheckState); | |
return orderByExpression; | |
} | |
public SortDirectionNode getDirection() { | |
if (direction == null) { | |
setDirection(new SortDirectionNode()); | |
} | |
return direction; | |
} | |
public Object getOrderByItem() { | |
return orderByItem; | |
} | |
public void setDirection(SortDirectionNode direction) { | |
this.direction = direction; | |
} | |
public void setOrderByItem(Object orderByItem) { | |
this.orderByItem = orderByItem; | |
} | |
} |