/******************************************************************************* | |
* 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.expressions.*; | |
/** | |
* INTERNAL | |
* <p><b>Purpose</b>: Represent an OR | |
* <p><b>Responsibilities</b>:<ul> | |
* <li> Generate the correct expression for an OR | |
* </ul> | |
* @author Jon Driscoll and Joel Lucuik | |
* @since TopLink 4.0 | |
*/ | |
public class OrNode extends LogicalOperatorNode { | |
private Set leftOuterScopeVariables = null; | |
private Set rightOuterScopeVariables = null; | |
/** | |
* Return a new OrNode. | |
*/ | |
public OrNode() { | |
super(); | |
} | |
/** | |
* INTERNAL | |
* Validate node and calculate its type. | |
*/ | |
public void validate(ParseTreeContext context) { | |
Set saved = context.getOuterScopeVariables(); | |
if (left != null) { | |
context.resetOuterScopeVariables(); | |
left.validate(context); | |
leftOuterScopeVariables = context.getOuterScopeVariables(); | |
} | |
if (right != null) { | |
context.resetOuterScopeVariables(); | |
right.validate(context); | |
rightOuterScopeVariables = context.getOuterScopeVariables(); | |
} | |
context.resetOuterScopeVariables(saved); | |
if ((left != null) && (right != null)) { | |
left.validateParameter(context, right.getType()); | |
right.validateParameter(context, left.getType()); | |
} | |
TypeHelper typeHelper = context.getTypeHelper(); | |
setType(typeHelper.getBooleanType()); | |
} | |
/** | |
* INTERNAL | |
* Return a EclipseLink expression by 'OR'ing the expressions from the left and right nodes | |
*/ | |
public Expression generateExpression(GenerationContext context) { | |
// Get the left expression | |
Expression leftExpr = getLeft().generateExpression(context); | |
leftExpr = appendOuterScopeVariableJoins( | |
leftExpr, leftOuterScopeVariables, context); | |
Expression rightExpr = getRight().generateExpression(context); | |
rightExpr = appendOuterScopeVariableJoins( | |
rightExpr, rightOuterScopeVariables, context); | |
// Or it with whatever the right expression is | |
return leftExpr.or(rightExpr); | |
} | |
/** | |
* INTERNAL | |
*/ | |
private Expression appendOuterScopeVariableJoins( | |
Expression expr, Set outerScopeVariables, GenerationContext context) { | |
if ((outerScopeVariables == null) || outerScopeVariables.isEmpty()) { | |
// no outer scope variables => nothing to be done | |
return expr; | |
} | |
Expression joins = context.joinVariables(outerScopeVariables); | |
return appendExpression(expr, joins); | |
} | |
} |