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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;

/**
 * One of the aggregate functions. The arguments must be numeric.
 * 
 * SUM returns Long when applied to state-fields of integral types (other than
 * BigInteger); Double when applied to state-fields of floating point
 * types; BigInteger when applied to state-fields of type BigInteger; and
 * BigDecimal when applied to state-fields of type BigDecimal. If
 * SUM, AVG, MAX, or MIN is used, and there are no values to which the
 * aggregate function can be applied, the result of the aggregate function is NULL. If
 * COUNT is used, and there are no values to which COUNT can be applied, the
 * result of the aggregate function is 0.
 *
 * 
BNF: expression ::= SUM([DISTINCT] state_field_path_expression)
 *
 * @version 2.5
 * @since 2.3
 * @author Pascal Filion
 */
public final class SumFunction extends AggregateFunction {

    /**
     * Creates a new SumFunction.
     *
     * @param parent The parent of this expression
     */
    public SumFunction(AbstractExpression parent) {
        super(parent, SUM);
    }

    /**
     * {@inheritDoc}
     */
    public void accept(ExpressionVisitor visitor) {
        visitor.visit(this);
    }
}