| /* |
| * Copyright (c) 2006, 2021 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; |
| |
| /** |
| * An entity type expression can be used to restrict query polymorphism. The <b>TYPE</b> operator |
| * returns the exact type of the argument. |
| * <p> |
| * Part of JPA 2.0. |
| * |
| * <div><b>BNF:</b> <code>type_discriminator ::= TYPE(identification_variable | |
| * single_valued_object_path_expression | |
| * input_parameter)</code></div> |
| * |
| * @version 2.5 |
| * @since 2.3 |
| * @author Pascal Filion |
| */ |
| public final class TypeExpression extends AbstractSingleEncapsulatedExpression { |
| |
| /** |
| * Creates a new <code>TypeExpression</code>. |
| * |
| * @param parent The parent of this expression |
| */ |
| public TypeExpression(AbstractExpression parent) { |
| super(parent, TYPE); |
| } |
| |
| @Override |
| public void accept(ExpressionVisitor visitor) { |
| visitor.visit(this); |
| } |
| |
| @Override |
| public String getEncapsulatedExpressionQueryBNFId() { |
| return InternalEntityTypeExpressionBNF.ID; |
| } |
| |
| @Override |
| public JPQLQueryBNF getQueryBNF() { |
| return getQueryBNF(TypeExpressionBNF.ID); |
| } |
| |
| @Override |
| protected AbstractExpression parse(WordParser wordParser, String queryBNFId, boolean tolerant) { |
| |
| if (tolerant) { |
| return super.parse(wordParser, queryBNFId, tolerant); |
| } |
| |
| return buildExpressionFromFallingBack( |
| wordParser, |
| wordParser.word(), |
| getQueryBNF(InternalEntityTypeExpressionBNF.ID), |
| null, |
| tolerant |
| ); |
| } |
| } |