| /* |
| * Copyright (c) 2012, 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.tools.resolver; |
| |
| import org.eclipse.persistence.jpa.jpql.ExpressionTools; |
| import org.eclipse.persistence.jpa.jpql.parser.Expression; |
| import org.eclipse.persistence.jpa.jpql.parser.IdentificationVariable; |
| import org.eclipse.persistence.jpa.jpql.parser.SimpleSelectStatement; |
| import org.eclipse.persistence.jpa.jpql.parser.SubExpression; |
| import org.eclipse.persistence.jpa.jpql.parser.TableVariableDeclaration; |
| import org.eclipse.persistence.jpa.jpql.tools.JPQLQueryContext; |
| |
| /** |
| * The EclipseLink implementation of {@link DeclarationResolver} that adds support for its |
| * additional support. |
| * |
| * @version 2.4 |
| * @since 2.4 |
| * @author Pascal Filion |
| */ |
| public class EclipseLinkDeclarationResolver extends DeclarationResolver { |
| |
| /** |
| * Creates a new <code>EclipseLinkDeclarationResolver</code>. |
| * |
| * @param parent The parent resolver if this is used for a subquery or null if it's used for the |
| * top-level query |
| * @param queryContext The context used to query information about the query |
| */ |
| public EclipseLinkDeclarationResolver(DeclarationResolver parent, JPQLQueryContext queryContext) { |
| super(parent, queryContext); |
| } |
| |
| @Override |
| protected DeclarationVisitor buildDeclarationVisitor() { |
| return new DeclarationVisitor(); |
| } |
| |
| protected class DeclarationVisitor extends DeclarationResolver.DeclarationVisitor { |
| |
| @Override |
| public void visit(SimpleSelectStatement expression) { |
| |
| // The parent query is using a subquery in the FROM clause |
| if (buildingDeclaration) { |
| currentDeclaration = new SubqueryDeclaration(); |
| currentDeclaration.rootPath = ExpressionTools.EMPTY_STRING; |
| currentDeclaration.baseExpression = expression; |
| addDeclaration(currentDeclaration); |
| } |
| // Simply traversing the tree to create the declarations |
| else { |
| super.visit(expression); |
| } |
| } |
| |
| @Override |
| public void visit(SubExpression expression) { |
| expression.getExpression().accept(this); |
| } |
| |
| public void visit(TableVariableDeclaration expression) { |
| |
| currentDeclaration = new TableDeclaration(); |
| currentDeclaration.declarationExpression = expression; |
| currentDeclaration.baseExpression = expression.getTableExpression(); |
| currentDeclaration.rootPath = expression.getTableExpression().getExpression().toParsedText(); |
| |
| Expression identificationVariable = expression.getIdentificationVariable(); |
| String variableName = visitDeclaration(expression, identificationVariable); |
| |
| if (variableName != ExpressionTools.EMPTY_STRING) { |
| currentDeclaration.identificationVariable = (IdentificationVariable) identificationVariable; |
| } |
| |
| addDeclaration(currentDeclaration); |
| } |
| } |
| } |