/******************************************************************************* | |
* 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; | |
/** | |
* INTERNAL | |
* <p><b>Purpose</b>: Represent the MEMBER-OF operator | |
* <p><b>Responsibilities</b>:<ul> | |
* <li> MEMBER OF is not supported. | |
* </ul> | |
* @author Jon Driscoll and Joel Lucuik | |
* @since since July 2003 | |
*/ | |
import org.eclipse.persistence.expressions.*; | |
public class MemberOfNode extends BinaryOperatorNode { | |
private boolean notIndicated = false; | |
//If we're dealing with a NOT, we store the expression for the left. | |
//When we get to the one-to-many on the right, it will handle the noneOf using | |
//the receiver stored in the context. | |
//(i.e. secondLastRightExpression.noneOf(lastRightVariable, leftExpression) | |
private Expression leftExpression = null; | |
/** | |
* Return a new MemberOfNode | |
*/ | |
public MemberOfNode() { | |
super(); | |
} | |
/** | |
* INTERNAL makeNodeOneToMany: | |
* Traverse to the leaf on theNode and mark as one to many | |
*/ | |
public void makeNodeOneToMany(Node theNode) { | |
Node currentNode = theNode; | |
do { | |
if (!currentNode.hasRight()) { | |
((AttributeNode)currentNode).setRequiresCollectionAttribute(true); | |
return; | |
} | |
currentNode = currentNode.getRight(); | |
} while (true); | |
} | |
/** | |
* INTERNAL | |
* Validate node and calculates its type. | |
*/ | |
public void validate(ParseTreeContext context) { | |
super.validate(context); | |
Node left = getLeft(); | |
if (left.isVariableNode() && ((VariableNode)left).isAlias(context)) { | |
context.usedVariable(((VariableNode)left).getCanonicalVariableName()); | |
} | |
left.validateParameter(context, right.getType()); | |
TypeHelper typeHelper = context.getTypeHelper(); | |
setType(typeHelper.getBooleanType()); | |
} | |
public Expression generateExpression(GenerationContext context) { | |
// Need to make sure one of the node is marked as a one to many | |
if (getRight().isParameterNode()) { | |
makeNodeOneToMany(getLeft()); | |
} else { | |
makeNodeOneToMany(getRight()); | |
} | |
//Handle NOT. Store the expression for the left, let VariableNode handle it. | |
if (notIndicated()) { | |
Expression resultFromRight = null; | |
context.setMemberOfNode(this); | |
this.setLeftExpression(getLeft().generateExpression(context)); | |
resultFromRight = getRight().generateExpression(context); | |
//clean up | |
context.setMemberOfNode(null); | |
this.setLeftExpression(null); | |
return resultFromRight; | |
} else { | |
//otherwise, handle like normal anyOf() | |
return getRight().generateExpression(context).equal(getLeft().generateExpression(context)); | |
} | |
} | |
/** | |
* INTERNAL | |
* Indicate if a NOT was found in the WHERE clause. | |
* Examples: | |
* ...WHERE ... NOT MEMBER OF | |
*/ | |
public void indicateNot() { | |
notIndicated = true; | |
} | |
public boolean notIndicated() { | |
return notIndicated; | |
} | |
//set and get the leftExpression. This is for NOT MEMBER OF. | |
public void setLeftExpression(Expression newLeftExpression) { | |
leftExpression = newLeftExpression; | |
} | |
public Expression getLeftExpression() { | |
return leftExpression; | |
} | |
} |