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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.WordParser;

/**
 * One of the aggregate functions. The return type of this function is a Long.
 *
 * 
BNF: expression ::= COUNT ([DISTINCT] identification_variable | * state_field_path_expression | * single_valued_object_path_expression)

* * @version 2.5 * @since 2.3 * @author Pascal Filion */ public final class CountFunction extends AggregateFunction { /** * Creates a new CountFunction. * * @param parent The parent of this expression */ public CountFunction(AbstractExpression parent) { super(parent, COUNT); } /** * {@inheritDoc} */ public void accept(ExpressionVisitor visitor) { visitor.visit(this); } /** * {@inheritDoc} */ @Override protected AbstractExpression buildEncapsulatedExpression(WordParser wordParser, String word) { if (KEY.equalsIgnoreCase(word)) { ExpressionFactory factory = getExpressionFactory(KeyExpressionFactory.ID); return factory.buildExpression(this, wordParser, word, getQueryBNF(), null, false); } if (VALUE.equalsIgnoreCase(word)) { ExpressionFactory factory = getExpressionFactory(ValueExpressionFactory.ID); return factory.buildExpression(this, wordParser, word, getQueryBNF(), null, false); } if (word.indexOf(DOT) == -1) { return new IdentificationVariable(this, word); } return super.buildEncapsulatedExpression(wordParser, word); } /** * {@inheritDoc} */ @Override public String getEncapsulatedExpressionQueryBNFId() { return InternalCountBNF.ID; } }




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