| /* |
| * Copyright (c) 2006, 2021 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: |
| // Oracle - initial API and implementation |
| // |
| package org.eclipse.persistence.jpa.jpql.parser; |
| |
| import org.eclipse.persistence.jpa.jpql.ExpressionTools; |
| |
| /** |
| * This expression wraps a sub-expression within parenthesis. |
| * |
| * <div><b>BNF:</b> <code>expression ::= (sub_expression)</code></div> |
| * |
| * @version 2.5 |
| * @since 2.3 |
| * @author Pascal Filion |
| */ |
| public final class SubExpression extends AbstractSingleEncapsulatedExpression { |
| |
| /** |
| * The {@link JPQLQueryBNF} coming from the parent that is used to parse the next portion of the query. |
| */ |
| private JPQLQueryBNF queryBNF; |
| |
| /** |
| * Creates a new <code>SubExpression</code>. |
| * |
| * @param parent The parent of this expression |
| * @param queryBNF The BNF coming from the parent that is used to parse the next portion of the query |
| */ |
| public SubExpression(AbstractExpression parent, JPQLQueryBNF queryBNF) { |
| super(parent, ExpressionTools.EMPTY_STRING); |
| this.queryBNF = queryBNF; |
| } |
| |
| @Override |
| public void accept(ExpressionVisitor visitor) { |
| visitor.visit(this); |
| } |
| |
| @Override |
| protected boolean areLogicalIdentifiersSupported() { |
| return true; |
| } |
| |
| @Override |
| public String getEncapsulatedExpressionQueryBNFId() { |
| return queryBNF.getId(); |
| } |
| |
| @Override |
| public JPQLQueryBNF findQueryBNF(Expression expression) { |
| |
| if (hasExpression() && (getExpression().isAncestor(expression))) { |
| return queryBNF; |
| } |
| |
| return getParent().findQueryBNF(expression); |
| } |
| |
| @Override |
| public JPQLQueryBNF getQueryBNF() { |
| return queryBNF; |
| } |
| |
| @Override |
| protected boolean handleCollection(JPQLQueryBNF queryBNF) { |
| return true; |
| } |
| } |