| /* |
| * Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. See the NOTICE file distributed with |
| * this work for additional information regarding copyright ownership. |
| * The ASF licenses this file to You under the Apache License, Version 2.0 |
| * (the "License"); you may not use this file except in compliance with |
| * the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| package org.apache.openejb.core.cmp.cmp2; |
| |
| import org.apache.openejb.BeanContext; |
| |
| import javax.ejb.EJBException; |
| import javax.ejb.EJBLocalObject; |
| import javax.ejb.EntityBean; |
| |
| // |
| // WARNING: Do not refactor this class. It is used by the Cmp2Generator. |
| // |
| public class SingleValuedCmr<Bean extends EntityBean, Proxy extends EJBLocalObject> { |
| private final EntityBean source; |
| private final String sourceProperty; |
| private final String relatedProperty; |
| private final BeanContext relatedInfo; |
| |
| public SingleValuedCmr(EntityBean source, String sourceProperty, Class<Bean> relatedType, String relatedProperty) { |
| if (source == null) throw new NullPointerException("source is null"); |
| if (relatedType == null) throw new NullPointerException("relatedType is null"); |
| this.source = source; |
| this.sourceProperty = sourceProperty; |
| this.relatedProperty = relatedProperty; |
| |
| this.relatedInfo = Cmp2Util.getBeanContext(relatedType); |
| } |
| |
| public Proxy get(Bean entity) throws EJBException { |
| if (sourceProperty == null) { |
| throw new EJBException("Internal error: this container managed relationship is unidirectional and, " + |
| "this entity does not have a cmr field for the relationship"); |
| } |
| |
| if (entity == null) return null; |
| |
| Proxy ejbProxy = Cmp2Util.<Proxy>getEjbProxy(relatedInfo, entity); |
| return ejbProxy; |
| } |
| |
| public Bean set(Bean oldBean, Proxy newValue) throws EJBException { |
| Bean newBean = Cmp2Util.<Bean>getEntityBean(newValue); |
| if (newValue != null && newBean == null) { |
| // todo verify that this is the only way null can be returned |
| throw new IllegalArgumentException("A deleted bean can not be assigned to a relationship"); |
| } |
| |
| if (relatedProperty != null) { |
| // clear back reference in the old related bean |
| if (oldBean != null) { |
| toCmp2Entity(oldBean).OpenEJB_removeCmr(relatedProperty, source); |
| } |
| |
| if (newValue != null) { |
| // set the back reference in the new related bean |
| Object oldBackRef = toCmp2Entity(newBean).OpenEJB_addCmr(relatedProperty, source); |
| |
| // if the new related beas was related to another bean, we need |
| // to clear the back reference in that old bean |
| if (oldBackRef != null) { |
| toCmp2Entity(oldBackRef).OpenEJB_removeCmr(sourceProperty, newBean); |
| } |
| } |
| } |
| return newBean; |
| } |
| |
| public void deleted(Bean oldBean) throws EJBException { |
| set(oldBean, null); |
| } |
| |
| private Cmp2Entity toCmp2Entity(Object object) { |
| return (Cmp2Entity) object; |
| } |
| } |