| /******************************************************************************* |
| * Copyright (c) 2006, 2008 Oracle. All rights reserved. |
| * This program and the accompanying materials are made available under the |
| * terms of the Eclipse Public License v1.0, which accompanies this distribution |
| * and is available at http://www.eclipse.org/legal/epl-v10.html. |
| * |
| * Contributors: |
| * Oracle - initial API and implementation |
| ******************************************************************************/ |
| package org.eclipse.jpt.core.internal.context.java; |
| |
| import org.eclipse.jpt.core.JpaFactory; |
| import org.eclipse.jpt.core.context.java.JavaAttributeMapping; |
| import org.eclipse.jpt.core.context.java.JavaAttributeMappingProvider; |
| import org.eclipse.jpt.core.context.java.JavaPersistentAttribute; |
| |
| /** |
| * This mapping provider implementation is used to create a JavaNullAttributeMapping. |
| * A JavaNullAttributeMapping should be used when no "mapping" annotation |
| * exists on a Java attribute *and* no default mapping applies. |
| */ |
| public class JavaNullAttributeMappingProvider |
| implements JavaAttributeMappingProvider |
| { |
| |
| // singleton |
| private static final JavaNullAttributeMappingProvider INSTANCE = new JavaNullAttributeMappingProvider(); |
| |
| /** |
| * Return the singleton. |
| */ |
| public static JavaAttributeMappingProvider instance() { |
| return INSTANCE; |
| } |
| |
| /** |
| * Ensure single instance. |
| */ |
| private JavaNullAttributeMappingProvider() { |
| super(); |
| } |
| |
| public String getKey() { |
| return null; |
| } |
| |
| public String getAnnotationName() { |
| return null; |
| } |
| |
| public JavaAttributeMapping buildMapping(JavaPersistentAttribute parent, JpaFactory factory) { |
| return factory.buildJavaNullAttributeMapping(parent); |
| } |
| } |