| /* |
| * 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.internal.jpa.jpql; |
| |
| import java.util.ArrayList; |
| import java.util.Collections; |
| import java.util.List; |
| import org.eclipse.persistence.expressions.Expression; |
| import org.eclipse.persistence.jpa.jpql.parser.CollectionExpression; |
| import org.eclipse.persistence.jpa.jpql.parser.EclipseLinkAnonymousExpressionVisitor; |
| import org.eclipse.persistence.jpa.jpql.parser.HierarchicalQueryClause; |
| import org.eclipse.persistence.jpa.jpql.parser.OrderSiblingsByClause; |
| import org.eclipse.persistence.queries.ReadAllQuery; |
| |
| /** |
| * This visitor is responsible to populate a {@link ReadAllQuery}. |
| * |
| * @version 2.5 |
| * @since 2.5 |
| * @author Pascal Filion |
| */ |
| class ReadAllQueryVisitor extends AbstractObjectLevelReadQueryVisitor { |
| |
| /** |
| * Creates a new <code>ReadAllQueryVisitor</code>. |
| * |
| * @param queryContext The context used to query information about the application metadata and |
| * cached information |
| * @param query The {@link org.eclipse.persistence.queries.ReportQuery} to populate by using this visitor to visit the parsed |
| * tree representation of the JPQL query |
| */ |
| ReadAllQueryVisitor(JPQLQueryContext queryContext, ReadAllQuery query) { |
| super(queryContext, query); |
| } |
| |
| @Override |
| public void visit(HierarchicalQueryClause expression) { |
| |
| // START WITH clause |
| Expression startWithClause = null; |
| |
| if (expression.hasStartWithClause()) { |
| startWithClause = queryContext.buildExpression(expression.getStartWithClause()); |
| } |
| |
| // CONNECT BY clause |
| Expression connectByClause = queryContext.buildExpression(expression.getConnectByClause()); |
| |
| // ORDER SIBLINGS BY clause |
| List<Expression> orderItems = Collections.<Expression>emptyList(); |
| |
| if (expression.hasOrderSiblingsByClause()) { |
| OrderSiblingsByClauseVisitor visitor = new OrderSiblingsByClauseVisitor(); |
| expression.getOrderSiblingsByClause().accept(visitor); |
| orderItems = visitor.orderByItems; |
| } |
| |
| // Now add the hierarchical query clause |
| ReadAllQuery query = (ReadAllQuery) this.query; |
| query.setHierarchicalQueryClause(startWithClause, connectByClause, orderItems); |
| } |
| |
| private class OrderSiblingsByClauseVisitor extends EclipseLinkAnonymousExpressionVisitor { |
| |
| /** |
| * The ordered list of items. |
| */ |
| List<Expression> orderByItems; |
| |
| /** |
| * Creates a new <code>OrderSiblingsByClauseVisitor</code>. |
| */ |
| OrderSiblingsByClauseVisitor() { |
| super(); |
| orderByItems = new ArrayList<>(); |
| } |
| |
| @Override |
| public void visit(CollectionExpression expression) { |
| expression.acceptChildren(this); |
| } |
| |
| @Override |
| public void visit(OrderSiblingsByClause expression) { |
| expression.getOrderByItems().accept(this); |
| } |
| |
| @Override |
| public void visit(org.eclipse.persistence.jpa.jpql.parser.Expression expression) { |
| orderByItems.add(queryContext.buildExpression(expression)); |
| } |
| } |
| } |