| /* |
| * 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; |
| |
| /** |
| * The <b>FROM</b> clause of a query defines the domain of the query by declaring identification |
| * variables. An identification variable is an identifier declared in the <b>FROM</b> clause of a |
| * query. The domain of the query may be constrained by path expressions. Identification variables |
| * designate instances of a particular entity abstract schema type. The <b>FROM</b> clause can |
| * contain multiple identification variable declarations separated by a comma (,). |
| * <p> |
| * JPA 1.0, 2.0, 2.1, EclipseLink 1.0 - 2.4: |
| * <div><b>BNF:</b> <code>from_clause ::= FROM identification_variable_declaration {, {identification_variable_declaration | collection_member_declaration}}*</code><p></p></div> |
| * |
| * EclipseLink 2.5: |
| * <div><b>BNF:</b> <code>from_clause ::= FROM identification_variable_declaration {, {identification_variable_declaration | collection_member_declaration}}* [hierarchical_query_clause] [asof_clause]</code><p></p></div> |
| * |
| * @version 2.5 |
| * @since 2.3 |
| * @author Pascal Filion |
| */ |
| public final class FromClause extends AbstractFromClause { |
| |
| /** |
| * Creates a new <code>FromClause</code>. |
| * |
| * @param parent The parent of this expression |
| */ |
| public FromClause(AbstractExpression parent) { |
| super(parent); |
| } |
| |
| /** |
| * {@inheritDoc} |
| */ |
| @Override |
| public void accept(ExpressionVisitor visitor) { |
| visitor.visit(this); |
| } |
| |
| /** |
| * {@inheritDoc} |
| */ |
| @Override |
| public String getDeclarationQueryBNFId() { |
| return InternalFromClauseBNF.ID; |
| } |
| |
| /** |
| * {@inheritDoc} |
| */ |
| @Override |
| public JPQLQueryBNF getQueryBNF() { |
| return getQueryBNF(FromClauseBNF.ID); |
| } |
| } |