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/*
* Copyright (c) 2006, 2018 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
* JSR-338 - Java Persistence 2.1.
*
* 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 DefaultJPQLGrammar.
*/
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();
}
/**
* {@inheritDoc}
*/
public ExpressionRegistry getExpressionRegistry() {
return instance().getExpressionRegistry();
}
/**
* {@inheritDoc}
*/
public JPAVersion getJPAVersion() {
return instance().getJPAVersion();
}
/**
* {@inheritDoc}
*/
public String getProvider() {
return instance().getProvider();
}
/**
* {@inheritDoc}
*/
public String getProviderVersion() {
return ExpressionTools.EMPTY_STRING;
}
/**
* {@inheritDoc}
*/
@Override
public String toString() {
return instance().toString();
}
}