| /* |
| * Copyright (c) 2011, 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.internal.jpa.jpql; |
| |
| import java.util.Collections; |
| import java.util.LinkedList; |
| import java.util.List; |
| import org.eclipse.persistence.jpa.jpql.parser.IdentificationVariableDeclaration; |
| import org.eclipse.persistence.jpa.jpql.parser.Join; |
| import org.eclipse.persistence.jpa.jpql.parser.RangeVariableDeclaration; |
| |
| /** |
| * The abstract definition of a range declaration, which is used to navigate to a "root" object. |
| * |
| * @see DerivedDeclaration |
| * @see RangeDeclaration |
| * |
| * @version 2.5 |
| * @since 2.4 |
| * @author Pascal Filion |
| */ |
| abstract class AbstractRangeDeclaration extends Declaration { |
| |
| /** |
| * The list of <b>JOIN</b> expressions that are declared in the same declaration than the range |
| * variable declaration represented by this declaration. |
| */ |
| protected List<Join> joins; |
| |
| /** |
| * Creates a new <code>AbstractRangeDeclaration</code>. |
| * |
| * @param queryContext The context used to query information about the application metadata and |
| * cached information |
| */ |
| AbstractRangeDeclaration(JPQLQueryContext queryContext) { |
| super(queryContext); |
| } |
| |
| /** |
| * Adds the given {@link Join}. |
| * |
| * @param join The {@link Join} that is declared in the range variable declaration |
| */ |
| void addJoin(Join join) { |
| if (joins == null) { |
| joins = new LinkedList<>(); |
| } |
| joins.add(join); |
| } |
| |
| @Override |
| public RangeVariableDeclaration getBaseExpression() { |
| return (RangeVariableDeclaration) super.getBaseExpression(); |
| } |
| |
| @Override |
| public IdentificationVariableDeclaration getDeclarationExpression() { |
| return (IdentificationVariableDeclaration) super.getDeclarationExpression(); |
| } |
| |
| @Override |
| public List<Join> getJoins() { |
| if (joins == null) { |
| return Collections.emptyList(); |
| } |
| return joins; |
| } |
| |
| @Override |
| public boolean hasJoins() { |
| return joins != null; |
| } |
| } |