| /* |
| * Copyright (c) 2012, 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; |
| |
| /** |
| * A <code><b>START WITH</b></code> clause is optional and specifies the root row(s) of the hierarchy. |
| * If this clause is omitted, then Oracle uses all rows in the table as root rows. The <code><b>START |
| * WITH</b></code> condition can contain a subquery, but it cannot contain a scalar subquery expression. |
| * |
| * <div><b>BNF:</b> <code>start_with_clause ::= <b>START WITH</b> conditional_expression</code></div> |
| * |
| * @see HierarchicalQueryClause |
| * |
| * @version 2.5 |
| * @since 2.5 |
| * @author Pascal Filion |
| */ |
| public final class StartWithClause extends AbstractConditionalClause { |
| |
| /** |
| * Creates a new <code>StartWithClause</code>. |
| * |
| * @param parent The parent of this expression |
| */ |
| public StartWithClause(AbstractExpression parent) { |
| super(parent, Expression.START_WITH); |
| } |
| |
| @Override |
| public void accept(ExpressionVisitor visitor) { |
| acceptUnknownVisitor(visitor); |
| } |
| |
| @Override |
| public JPQLQueryBNF getQueryBNF() { |
| return getQueryBNF(StartWithClauseBNF.ID); |
| } |
| } |