| /* |
| * 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; |
| |
| import org.eclipse.persistence.jpa.jpql.WordParser; |
| |
| /** |
| * Returns an expression that allows a join <b>ON</b> clause to be defined. |
| * <p> |
| * New to EclipseLink 2.4 and JPA 2.1. |
| * |
| * <div><b>BNF:</b> <code>join_condition ::= ON conditional_expression</code></div> |
| * <p> |
| * Example: <code>SELECT e FROM Employee e LEFT JOIN e.projects p ON p.budget {@literal >} 10000</code> |
| * |
| * @version 2.4 |
| * @since 2.4 |
| * @author James Sutherland |
| */ |
| public final class OnClause extends AbstractConditionalClause { |
| |
| /** |
| * Creates a new <code>OnClause</code>. |
| * |
| * @param parent The parent of this expression |
| */ |
| public OnClause(AbstractExpression parent) { |
| super(parent, ON); |
| } |
| |
| @Override |
| public void accept(ExpressionVisitor visitor) { |
| visitor.visit(this); |
| } |
| |
| @Override |
| public JPQLQueryBNF getQueryBNF() { |
| return getQueryBNF(OnClauseBNF.ID); |
| } |
| |
| @Override |
| protected boolean isParsingComplete(WordParser wordParser, String word, Expression expression) { |
| return word.equalsIgnoreCase(LEFT) || |
| word.equalsIgnoreCase(OUTER) || |
| word.equalsIgnoreCase(FETCH) || |
| word.equalsIgnoreCase(INNER) || |
| word.equalsIgnoreCase(JOIN) || |
| super.isParsingComplete(wordParser, word, expression); |
| } |
| } |