| /* |
| * Copyright (c) 1998, 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 from Oracle TopLink |
| package org.eclipse.persistence.internal.jpa.parsing; |
| |
| import java.util.Set; |
| |
| import org.eclipse.persistence.expressions.*; |
| import org.eclipse.persistence.queries.ReportQuery; |
| |
| /** |
| * INTERNAL |
| * <p><b>Purpose</b>: Represent a subquery. |
| */ |
| public class SubqueryNode extends Node { |
| |
| private JPQLParseTree subqueryParseTree; |
| |
| /** Set of names of variables declared in an outer scope and used in teh |
| * subquery. */ |
| private Set<String> outerVars; |
| |
| /** |
| * Return a new SubqueryNode. |
| */ |
| public SubqueryNode() { |
| super(); |
| } |
| |
| /** */ |
| public ReportQuery getReportQuery(GenerationContext context) { |
| ReportQuery innerQuery = new ReportQuery(); |
| GenerationContext innerContext = |
| subqueryParseTree.populateSubquery(innerQuery, context); |
| Expression joins = innerContext.joinVariables(outerVars); |
| if (joins != null) { |
| Expression where = innerQuery.getSelectionCriteria(); |
| where = appendExpression(where, joins); |
| innerQuery.setSelectionCriteria(where); |
| } |
| return innerQuery; |
| } |
| |
| /** |
| * INTERNAL |
| * If called the subquery is part of the WHERE clause of an UPDATE or |
| * DELETE statement that does not define an identification variable. |
| * The method checks the clauses of the subquery for unqualified fields |
| * accesses. |
| */ |
| @Override |
| public Node qualifyAttributeAccess(ParseTreeContext context) { |
| subqueryParseTree.getFromNode().qualifyAttributeAccess(context); |
| subqueryParseTree.getQueryNode().qualifyAttributeAccess(context); |
| if (subqueryParseTree.getWhereNode() != null) { |
| subqueryParseTree.getWhereNode().qualifyAttributeAccess(context); |
| } |
| if (subqueryParseTree.getGroupByNode() != null) { |
| subqueryParseTree.getGroupByNode().qualifyAttributeAccess(context); |
| } |
| if (subqueryParseTree.getHavingNode() != null) { |
| subqueryParseTree.getHavingNode().qualifyAttributeAccess(context); |
| } |
| return this; |
| } |
| |
| /** |
| * INTERNAL |
| * Validate node and calculate its type. |
| */ |
| @Override |
| public void validate(ParseTreeContext context) { |
| subqueryParseTree.validate(context); |
| outerVars = context.getOuterScopeVariables(); |
| SelectNode selectNode = (SelectNode)subqueryParseTree.getQueryNode(); |
| // Get the select expression, subqueries only have one |
| Node selectExpr = selectNode.getSelectExpressions().get(0); |
| setType(selectExpr.getType()); |
| } |
| |
| /** |
| * INTERNAL |
| * Generate the EclipseLink expression for this node |
| */ |
| @Override |
| public Expression generateExpression(GenerationContext context) { |
| Expression base = context.getBaseExpression(); |
| ReportQuery innerQuery = getReportQuery(context); |
| return base.subQuery(innerQuery); |
| } |
| |
| /** |
| * INTERNAL |
| * Is this node a SubqueryNode |
| */ |
| @Override |
| public boolean isSubqueryNode() { |
| return true; |
| } |
| |
| /** */ |
| public void setParseTree(JPQLParseTree parseTree) { |
| this.subqueryParseTree = parseTree; |
| } |
| |
| /** */ |
| public JPQLParseTree getParseTree() { |
| return subqueryParseTree; |
| } |
| |
| } |
| |