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/*
 * Copyright (c) 1998, 2023 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 from Oracle TopLink
package org.eclipse.persistence.internal.jpa.parsing;

import org.eclipse.persistence.expressions.Expression;
import org.eclipse.persistence.queries.ObjectLevelReadQuery;
import org.eclipse.persistence.queries.ReportQuery;

/**
 * INTERNAL
 * 

Purpose: Model a AVG *

Responsibilities:

    *
  • Apply itself to a query correctly *
*/ public class AvgNode extends AggregateNode { /** * INTERNAL * Apply this node to the passed query */ @Override public void applyToQuery(ObjectLevelReadQuery theQuery, GenerationContext context) { if (theQuery.isReportQuery()) { ReportQuery reportQuery = (ReportQuery)theQuery; reportQuery.addAttribute(resolveAttribute(), generateExpression(context), Double.class); } } /** * INTERNAL * Validate node and calculate its type. */ @Override public void validate(ParseTreeContext context) { if (left != null) { left.validate(context); } TypeHelper typeHelper = context.getTypeHelper(); setType(typeHelper.getDoubleClassType()); } /** * INTERNAL */ @Override protected Expression addAggregateExression(Expression expr) { return expr.average(); } /** * INTERNAL * Get the string representation of this node. */ @Override public String getAsString() { return "AVG(" + left.getAsString() + ")"; } }




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