| /* |
| * Copyright (c) 1998, 2020 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 v. 2.0 which is available at |
| * http://www.eclipse.org/legal/epl-2.0, |
| * or the Eclipse Distribution License v. 1.0 which is available at |
| * http://www.eclipse.org/org/documents/edl-v10.php. |
| * |
| * SPDX-License-Identifier: EPL-2.0 OR BSD-3-Clause |
| */ |
| |
| // Contributors: |
| // tware - initial implementation as part of JPA 2.0 RI |
| package org.eclipse.persistence.internal.jpa.parsing; |
| |
| import org.eclipse.persistence.expressions.Expression; |
| import org.eclipse.persistence.queries.ObjectLevelReadQuery; |
| import org.eclipse.persistence.queries.ReportQuery; |
| |
| /** |
| * INTERNAL |
| * <p><b>Purpose</b>: Represent an NULLIF in EJBQL |
| * <p><b>Responsibilities</b>:<ul> |
| * <li> Generate the correct expression for an NULLIF in EJBQL |
| * </ul> |
| * @author tware |
| * @since EclipseLink 1.2 |
| */ |
| public class NullIfNode extends Node implements AliasableNode { |
| |
| public NullIfNode(){ |
| super(); |
| } |
| |
| /** |
| * INTERNAL |
| * Apply this node to the passed query |
| */ |
| @Override |
| public void applyToQuery(ObjectLevelReadQuery theQuery, GenerationContext generationContext) { |
| if (theQuery instanceof ReportQuery) { |
| ReportQuery reportQuery = (ReportQuery)theQuery; |
| Expression expression = generateExpression(generationContext); |
| reportQuery.addItem("NullIf(" + getLeft().getAsString() + "," + getRight().getAsString() + ")", expression); |
| } |
| } |
| |
| /** |
| * INTERNAL |
| * Generate the a new EclipseLink NullIf expression for this node. |
| */ |
| @Override |
| public Expression generateExpression(GenerationContext context) { |
| Expression whereClause = getLeft().generateExpression(context).nullIf(getRight().generateExpression(context)); |
| return whereClause; |
| } |
| |
| @Override |
| public void validate(ParseTreeContext context) { |
| left.validate(context); |
| right.validate(context); |
| setType(left.getType()); |
| } |
| |
| @Override |
| public boolean isAliasableNode(){ |
| return true; |
| } |
| } |