| /***************************************************************** |
| * 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 |
| * |
| * https://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.cayenne.reflect; |
| |
| /** |
| * An accessor for fields storing embedded objects. This accessor will initialize null |
| * fields with appropriate embeddable objects when needed during get and set calls. |
| * |
| * @since 3.0 |
| */ |
| public class EmbeddedFieldAccessor implements Accessor { |
| |
| protected String propertyPath; |
| protected Accessor embeddedAccessor; |
| protected Accessor embeddableAccessor; |
| protected EmbeddableDescriptor embeddableDescriptor; |
| |
| public EmbeddedFieldAccessor(EmbeddableDescriptor embeddableDescriptor, |
| Accessor embeddedAccessor, Accessor embeddableAccessor) { |
| this.propertyPath = embeddedAccessor.getName() |
| + "." |
| + embeddableAccessor.getName(); |
| this.embeddableDescriptor = embeddableDescriptor; |
| this.embeddableAccessor = embeddableAccessor; |
| this.embeddedAccessor = embeddedAccessor; |
| } |
| |
| public String getName() { |
| return propertyPath; |
| } |
| |
| public Object getValue(Object object) throws PropertyException { |
| return embeddableAccessor.getValue(getEmbeddable(object)); |
| } |
| |
| public void setValue(Object object, Object newValue) throws PropertyException { |
| embeddableAccessor.setValue(getEmbeddable(object), newValue); |
| } |
| |
| /** |
| * Returns an embeddable object for the owner object, initializing embeddable if it is |
| * null. Currently supports only one level of embedding. |
| */ |
| protected Object getEmbeddable(Object owner) { |
| Object embeddable = embeddedAccessor.getValue(owner); |
| if (embeddable == null) { |
| embeddable = embeddableDescriptor.createObject(owner, embeddedAccessor |
| .getName()); |
| embeddedAccessor.setValue(owner, embeddable); |
| } |
| |
| return embeddable; |
| } |
| } |