| /* |
| * 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: |
| // 12/18/2009-2.1 Guy Pelletier |
| // - 211323: Add class extractor support to the EclipseLink-ORM.XML Schema |
| package org.eclipse.persistence.testing.models.jpa.xml.inheritance; |
| |
| import org.eclipse.persistence.descriptors.ClassDescriptor; |
| import org.eclipse.persistence.descriptors.ClassExtractor; |
| import org.eclipse.persistence.exceptions.DescriptorException; |
| import org.eclipse.persistence.expressions.ExpressionBuilder; |
| import org.eclipse.persistence.sessions.DataRecord; |
| import org.eclipse.persistence.sessions.Session; |
| |
| public class AppleExtractor extends ClassExtractor { |
| |
| /** |
| * Extract/compute the class from the database row and return the class. |
| * Map is used as the public interface to database row, the key is the |
| * field name, the value is the database value. |
| */ |
| @Override |
| @SuppressWarnings({"unchecked"}) |
| public <T> Class<T> extractClassFromRow(DataRecord databaseRow, Session session) { |
| if (databaseRow.containsKey("XML_MACBOOK_PRO.COLOR")) { |
| return (Class<T>) MacBookPro.class; |
| } else if (databaseRow.containsKey("XML_MACBOOK.RAM")) { |
| return (Class<T>) MacBook.class; |
| } else { |
| return (Class<T>) Apple.class; |
| } |
| } |
| |
| /** |
| * Allow for any initialization. This will be called on the apple descriptor. |
| */ |
| @Override |
| public void initialize(ClassDescriptor appleDescriptor, Session session) throws DescriptorException { |
| ExpressionBuilder builder = new ExpressionBuilder(); |
| |
| // Since macbook shares its table with macbookpro, we need to set |
| // the only instances expression. |
| ClassDescriptor macbookDescriptor = session.getDescriptor(org.eclipse.persistence.testing.models.jpa.xml.inheritance.MacBook.class); |
| macbookDescriptor.getInheritancePolicy().setOnlyInstancesExpression(builder.getField("XML_MACBOOK.RAM").lessThanEqual(4)); |
| |
| // MacBookPro does not require an expression since it defines a single |
| // concrete class. |
| } |
| } |