/******************************************************************************* | |
* 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 org.eclipse.persistence.expressions.*; | |
/** | |
* INTERNAL | |
* <p><b>Purpose</b>: Represent a '<>' in EJBQL | |
* <p><b>Responsibilities</b>:<ul> | |
* <li> Generate the correct expression for an '<>' in EJBQL | |
* </ul> | |
* @author Jon Driscoll and Joel Lucuik | |
* @since TopLink 4.0 | |
*/ | |
public class NotEqualsNode extends BinaryOperatorNode { | |
/** | |
* EqualsNode constructor comment. | |
*/ | |
public NotEqualsNode() { | |
super(); | |
} | |
/** | |
* INTERNAL | |
* Validate node and calculates its type. | |
*/ | |
public void validate(ParseTreeContext context) { | |
super.validate(context); | |
TypeHelper typeHelper = context.getTypeHelper(); | |
setType(typeHelper.getBooleanType()); | |
} | |
/** | |
* Resolve the expression. The steps are: | |
* 1. Set the expressionBuilder for the left and right nodes | |
* 2. Generate the expression for the left node | |
* 3. Add the .notEqual to the where clause returned from step 2 | |
* 4. Generate the expression for the right side and use it as the parameter for the .equals() | |
* 5. Return the completed where clause to the caller | |
*/ | |
public Expression generateExpression(GenerationContext context) { | |
Expression whereClause = getLeft().generateExpression(context); | |
whereClause = whereClause.notEqual(getRight().generateExpression(context)); | |
return whereClause; | |
} | |
/** | |
* INTERNAL | |
* Get the string representation of this node. | |
*/ | |
public String getAsString() { | |
return left.getAsString() + " <> " + right.getAsString(); | |
} | |
} |