/******************************************************************************* * Copyright (c) 2006, 2015 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 v1.0 and Eclipse Distribution License v. 1.0 * which accompanies this distribution. * The Eclipse Public License is available at http://www.eclipse.org/legal/epl-v10.html * and the Eclipse Distribution License is available at * http://www.eclipse.org/org/documents/edl-v10.php. * * Contributors: * Oracle - initial API and implementation * ******************************************************************************/ package org.eclipse.persistence.jpa.jpql.parser; /** * The query BNF for an aggregate expression. * <p> * JPA 1.0, 2.0: * <div><b>BNF:</b> <code>aggregate_expression ::= { AVG | MAX | MIN | SUM } ([DISTINCT] state_field_path_expression) | * COUNT ([DISTINCT] identification_variable | * state_field_path_expression | * single_valued_object_path_expression)</code> * <p></div> * JPA 2.1: * <div><b>BNF:</b> <code>aggregate_expression ::= { AVG | MAX | MIN | SUM } ([DISTINCT] state_field_path_expression) | * COUNT ([DISTINCT] identification_variable | * state_field_path_expression | * single_valued_object_path_expression) | * function_invocation</code> * <p></div> * * @version 2.4 * @since 2.3 * @author Pascal Filion */ @SuppressWarnings("nls") public final class AggregateExpressionBNF extends JPQLQueryBNF { /** * The unique identifier of this BNF rule. */ public static final String ID = "aggregate_expression"; /** * Creates a new <code>AggregateExpressionBNF</code>. */ public AggregateExpressionBNF() { super(ID); } /** * {@inheritDoc} */ @Override protected void initialize() { super.initialize(); registerExpressionFactory(AvgFunctionFactory.ID); registerExpressionFactory(MaxFunctionFactory.ID); registerExpressionFactory(MinFunctionFactory.ID); registerExpressionFactory(SumFunctionFactory.ID); registerExpressionFactory(CountFunctionFactory.ID); } }