| /* |
| * 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; |
| import org.eclipse.persistence.jpa.jpql.JPAVersion; |
| |
| /** |
| * This {@link JPQLGrammar JPQL grammar} provides support for parsing JPQL queries defined in the |
| * latest JPA functional specification. The current version of the functional specification is |
| * <a href="http://jcp.org/en/jsr/detail?id=317">JSR-338 - Java Persistence 2.1</a>. |
| * <p> |
| * Provisional API: This interface is part of an interim API that is still under development and |
| * expected to change significantly before reaching stability. It is available at this early stage |
| * to solicit feedback from pioneering adopters on the understanding that any code that uses this |
| * API will almost certainly be broken (repeatedly) as the API evolves. |
| * |
| * @see JPQLGrammar2_1 |
| * @see DefaultJPQLGrammar |
| * @see DefaultEclipseLinkJPQLGrammar |
| * |
| * @version 2.5 |
| * @since 2.4 |
| * @author Pascal Filion |
| */ |
| @SuppressWarnings("nls") |
| public final class DefaultJPQLGrammar implements JPQLGrammar { |
| |
| /** |
| * The generic persistence provider name: JPA. |
| */ |
| public static final String PROVIDER_NAME = "JPA"; |
| |
| /** |
| * Creates a new <code>DefaultJPQLGrammar</code>. |
| */ |
| private DefaultJPQLGrammar() { |
| super(); |
| } |
| |
| /** |
| * Returns the singleton instance of this class. |
| * |
| * @return The singleton instance of this {@link DefaultJPQLGrammar} |
| */ |
| public static JPQLGrammar instance() { |
| return JPQLGrammar2_1.instance(); |
| } |
| |
| @Override |
| public ExpressionRegistry getExpressionRegistry() { |
| return instance().getExpressionRegistry(); |
| } |
| |
| @Override |
| public JPAVersion getJPAVersion() { |
| return instance().getJPAVersion(); |
| } |
| |
| @Override |
| public String getProvider() { |
| return instance().getProvider(); |
| } |
| |
| @Override |
| public String getProviderVersion() { |
| return ExpressionTools.EMPTY_STRING; |
| } |
| |
| @Override |
| public String toString() { |
| return instance().toString(); |
| } |
| } |