/*
* Copyright (C) 2015 Red Hat, Inc. and/or its affiliates.
*
* 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 org.jboss.errai.databinding.rebind;
import static org.jboss.errai.codegen.util.Stmt.loadStatic;
import static org.jboss.errai.codegen.util.Stmt.loadVariable;
import static org.jboss.errai.codegen.util.Stmt.nestedCall;
import org.jboss.errai.codegen.Cast;
import org.jboss.errai.codegen.Statement;
import org.jboss.errai.codegen.exception.GenerationException;
import org.jboss.errai.codegen.meta.MetaClass;
import org.jboss.errai.codegen.util.Refs;
import org.jboss.errai.databinding.client.api.DataBinder;
import org.jboss.errai.databinding.client.api.StateSync;
import org.jboss.errai.ioc.client.api.CodeDecorator;
import org.jboss.errai.ioc.rebind.ioc.extension.IOCDecoratorExtension;
import org.jboss.errai.ioc.rebind.ioc.injector.api.Decorable;
import org.jboss.errai.ioc.rebind.ioc.injector.api.FactoryController;
import org.jboss.errai.ui.shared.api.annotations.ModelSetter;
/**
* Causes the generation of a proxy that overrides a method annotated with {@link ModelSetter}. The
* overridden method will update the model object managed by a {@link DataBinder} and pass the proxy
* returned by {@link DataBinder#getModel()} to the actual implementation.
*
* @author Mike Brock
* @author Christian Sadilek <csadilek@redhat.com>
*/
@CodeDecorator(order = 2)
public class ModelSetterDecorator extends IOCDecoratorExtension<ModelSetter> {
public ModelSetterDecorator(Class<ModelSetter> decoratesWith) {
super(decoratesWith);
}
@Override
public void generateDecorator(final Decorable decorable, final FactoryController controller) {
if (decorable.getAsMethod().getParameters() == null || decorable.getAsMethod().getParameters().length != 1)
throw new GenerationException("@ModelSetter method needs to have exactly one parameter: " + decorable.getAsMethod());
final MetaClass modelType =
(MetaClass) controller.getAttribute(DataBindingUtil.BINDER_MODEL_TYPE_VALUE);
if (!decorable.getAsMethod().getParameters()[0].getType().equals(modelType)) {
throw new GenerationException("@ModelSetter method parameter must be of type: " + modelType);
}
final Statement dataBinder = controller.getReferenceStmt(DataBindingUtil.BINDER_VAR_NAME, DataBinder.class);
final Statement proxyProperty =
controller.addProxyProperty("dataBinder", DataBinder.class, dataBinder);
final String modelParamName = decorable.getAsMethod().getParameters()[0].getName();
controller.addInvokeBefore(decorable.getAsMethod(),
nestedCall(proxyProperty)
.invoke("setModel", Refs.get(modelParamName), loadStatic(StateSync.class, "FROM_MODEL")));
controller.addInvokeBefore(
decorable.getAsMethod(),
loadVariable(modelParamName).assignValue(
Cast.to(decorable.getAsMethod().getParameters()[0].getType(), nestedCall(
proxyProperty).invoke("getModel"))));
}
}