| /* |
| * Copyright 2010 Google Inc. |
| * |
| * Licensed 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 com.google.web.bindery.requestfactory.shared.impl; |
| |
| import static com.google.web.bindery.requestfactory.shared.impl.Constants.REQUEST_CONTEXT_STATE; |
| import static com.google.web.bindery.requestfactory.shared.impl.Constants.STABLE_ID; |
| |
| import com.google.web.bindery.autobean.shared.AutoBean; |
| import com.google.web.bindery.autobean.shared.AutoBeanUtils; |
| import com.google.web.bindery.requestfactory.shared.BaseProxy; |
| import com.google.web.bindery.requestfactory.shared.impl.AbstractRequestContext.State; |
| |
| /** |
| * Contains behaviors common to all proxy instances. |
| */ |
| public class BaseProxyCategory { |
| /** |
| * Sniff all return values and ensure that if the current bean is a mutable |
| * EntityProxy, that its return values are mutable. |
| */ |
| // CHECKSTYLE_OFF |
| public static <T> T __intercept(AutoBean<?> bean, T returnValue) { |
| // CHECKSTYLE_ON |
| |
| AbstractRequestContext context = requestContext(bean); |
| |
| /* |
| * The context will be null if the bean is immutable. If the context is |
| * locked, don't try to edit. |
| */ |
| if (context == null || context.isLocked() || context.isDiffing()) { |
| return returnValue; |
| } |
| |
| /* |
| * EntityProxies need to be recorded specially by the RequestContext, so |
| * delegate to the edit() method for wiring up the context. |
| */ |
| if (returnValue instanceof BaseProxy) { |
| @SuppressWarnings("unchecked") |
| T toReturn = (T) context.editProxy((BaseProxy) returnValue); |
| return toReturn; |
| } |
| |
| if (returnValue instanceof Poser<?>) { |
| ((Poser<?>) returnValue).setFrozen(false); |
| } |
| |
| /* |
| * We're returning some object that's not an EntityProxy, most likely a |
| * Collection type. At the very least, propagate the current RequestContext |
| * so that editable chains can be constructed. |
| */ |
| AutoBean<T> otherBean = AutoBeanUtils.getAutoBean(returnValue); |
| if (otherBean != null) { |
| otherBean.setTag(REQUEST_CONTEXT_STATE, bean.getTag(REQUEST_CONTEXT_STATE)); |
| } |
| return returnValue; |
| } |
| |
| public static AbstractRequestContext requestContext(AutoBean<?> bean) { |
| State state = bean.<AbstractRequestContext.State> getTag(REQUEST_CONTEXT_STATE); |
| return state == null ? null : state.getCanonicalContext(); |
| } |
| |
| public static <T extends BaseProxy> SimpleProxyId<T> stableId(AutoBean<? extends T> bean) { |
| return bean.getTag(STABLE_ID); |
| } |
| } |