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/*
* Copyright (c) 2012, 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 UnionClauseFactory} creates a new {@link UnionClause} when the portion of the
* query to parse starts with UNION, INTERSECT
or EXCEPT
.
*
* @see UnionClause
* @version 2.4
* @since 2.4
* @author James Sutherland
*/
public final class UnionClauseFactory extends ExpressionFactory {
/**
* The unique identifier of this {@link UnionClauseFactory}.
*/
public static final String ID = Expression.UNION;
/**
* Creates a new UnionClauseFactory
.
*/
public UnionClauseFactory() {
super(ID, Expression.UNION,
Expression.INTERSECT,
Expression.EXCEPT);
}
/**
* {@inheritDoc}
*/
@Override
protected AbstractExpression buildExpression(AbstractExpression parent,
WordParser wordParser,
String word,
JPQLQueryBNF queryBNF,
AbstractExpression expression,
boolean tolerant) {
expression = new UnionClause(parent, word);
expression.parse(wordParser, tolerant);
return expression;
}
}