| /* |
| * 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: |
| // 06/10/2009 Andrei Ilitchev |
| // - JPA 2.0 - OrderedList support. |
| package org.eclipse.persistence.internal.expressions; |
| |
| import org.eclipse.persistence.expressions.Expression; |
| |
| /** |
| * Index expression may be created by QueryKeyExpression.index() method |
| * in case the QueryKeyExpression corresponds to a CollectionMapping with |
| * non-null listOrderField. |
| */ |
| public class IndexExpression extends FieldExpression { |
| |
| /** |
| * Only base QueryKeyExpression.index method can create IndexExpression - that's why no public constructor provided. |
| */ |
| IndexExpression(QueryKeyExpression baseExpression) { |
| super(null, baseExpression); |
| } |
| |
| /** |
| * INTERNAL: |
| * Normalize the expression into a printable structure. |
| */ |
| @Override |
| public Expression normalize(ExpressionNormalizer normalizer) { |
| // IndexExpression always has base QueryKeyExpression. |
| // Base expression should be normalized first: it sets the field, |
| // and may changes base expression |
| // from the original base QueryKeyExpression to TableExpression. |
| // That's why the base expression may be normalized again in super.normalize. |
| getBaseExpression().normalize(normalizer); |
| return super.normalize(normalizer); |
| } |
| } |