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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;
/**
* This {@link GroupByItemFactory} is responsible to return the right expression and to support
* invalid expression as well.
*
* @version 2.4
* @since 2.3
* @author Pascal Filion
*/
@SuppressWarnings("nls")
public final class GroupByItemFactory extends ExpressionFactory {
/**
* The unique identifier of this {@link GroupByItemFactory}.
*/
public static final String ID = "groupby_item";
/**
* Creates a new GroupByItemFactory
.
*/
public GroupByItemFactory() {
super(ID);
}
/**
* {@inheritDoc}
*/
@Override
protected AbstractExpression buildExpression(AbstractExpression parent,
WordParser wordParser,
String word,
JPQLQueryBNF queryBNF,
AbstractExpression expression,
boolean tolerant) {
// StateFieldPathExpression
if (word.indexOf(AbstractExpression.DOT) > -1) {
expression = new StateFieldPathExpression(parent, word);
expression.parse(wordParser, tolerant);
return expression;
}
ExpressionRegistry registry = getExpressionRegistry();
// When the tolerant mode is turned on, parse the invalid portion of the query
if (tolerant && registry.isIdentifier(word)) {
ExpressionFactory factory = registry.expressionFactoryForIdentifier(word);
if (factory == null) {
return null;
}
expression = factory.buildExpression(parent, wordParser, word, queryBNF, expression, tolerant);
if (expression != null) {
return new BadExpression(parent, expression);
}
}
// IdentificationVariable or any text
expression = new IdentificationVariable(parent, word);
expression.parse(wordParser, tolerant);
return expression;
}
}