| /* |
| * 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.internal.jpa.jpql; |
| |
| import org.eclipse.persistence.jpa.jpql.parser.AbstractSelectClause; |
| import org.eclipse.persistence.jpa.jpql.parser.AbstractSelectStatement; |
| import org.eclipse.persistence.jpa.jpql.parser.CollectionExpression; |
| import org.eclipse.persistence.jpa.jpql.parser.EclipseLinkAnonymousExpressionVisitor; |
| import org.eclipse.persistence.jpa.jpql.parser.GroupByClause; |
| import org.eclipse.persistence.jpa.jpql.parser.HavingClause; |
| import org.eclipse.persistence.jpa.jpql.parser.IdentificationVariable; |
| import org.eclipse.persistence.queries.ReportQuery; |
| |
| /** |
| * This visitor is responsible to populate a {@link ReportQuery}. |
| * |
| * @version 2.4 |
| * @since 2.3 |
| * @author Pascal Filion |
| * @author John Bracken |
| */ |
| final class ReportQueryVisitor extends ReadAllQueryVisitor { |
| |
| /** |
| * This array is used to store the type of the select {@link org.eclipse.persistence.jpa.jpql |
| * parser.Expression JPQL Expression} that is converted into an |
| * {@link org.eclipse.persistence.expressions.Expression EclipseLink Expression}. |
| */ |
| Class<?> type; |
| |
| /** |
| * Creates a new <code>ReportQueryVisitor</code>. |
| * |
| * @param queryContext The context used to query information about the application metadata and |
| * cached information |
| * @param query The {@link ReportQuery} to populate by using this visitor to visit the parsed |
| * tree representation of the JPQL query |
| */ |
| ReportQueryVisitor(JPQLQueryContext queryContext, ReportQuery query) { |
| super(queryContext, query); |
| } |
| |
| @Override |
| public void visit(GroupByClause expression) { |
| GroupByVisitor visitor = new GroupByVisitor(); |
| expression.accept(visitor); |
| } |
| |
| @Override |
| public void visit(HavingClause expression) { |
| ((ReportQuery) query).setHavingExpression(queryContext.buildExpression(expression)); |
| } |
| |
| @Override |
| void visitAbstractSelectClause(AbstractSelectClause expression) { |
| |
| // First set couple flags on the query |
| super.visitAbstractSelectClause(expression); |
| |
| // Now visit the select expressions and create the corresponding EclipseLink Expressions |
| ReportItemBuilder builder = new ReportItemBuilder(queryContext, (ReportQuery) query); |
| expression.accept(builder); |
| type = builder.type[0]; |
| } |
| |
| @Override |
| void visitAbstractSelectStatement(AbstractSelectStatement expression) { |
| |
| super.visitAbstractSelectStatement(expression); |
| |
| if (expression.hasHavingClause()) { |
| expression.getHavingClause().accept(this); |
| } |
| |
| if (expression.hasGroupByClause()) { |
| expression.getGroupByClause().accept(this); |
| } |
| } |
| |
| @Override |
| void visitIdentificationVariable(IdentificationVariable expression) { |
| // ReportQuery does not require it |
| } |
| |
| /** |
| * This visitor is responsible to add the {@link org.eclipse.persistence.jpa.jpql.parser.Expression |
| * group items} by traversing the group items. |
| */ |
| private class GroupByVisitor extends EclipseLinkAnonymousExpressionVisitor { |
| |
| @Override |
| public void visit(CollectionExpression expression) { |
| expression.acceptChildren(this); |
| } |
| |
| @Override |
| public void visit(GroupByClause expression) { |
| expression.getGroupByItems().accept(this); |
| } |
| |
| @Override |
| protected void visit(org.eclipse.persistence.jpa.jpql.parser.Expression expression) { |
| ((ReportQuery) query).addGrouping(queryContext.buildExpression(expression)); |
| } |
| } |
| } |