Package org.jboss.errai.ioc.rebind

Source Code of org.jboss.errai.ioc.rebind.ServiceIOCExtension

/*
* Copyright 2011 JBoss, a divison Red Hat, 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 org.jboss.errai.ioc.rebind;

import org.jboss.errai.bus.client.framework.MessageBus;
import org.jboss.errai.bus.server.annotations.Service;
import org.jboss.errai.ioc.client.api.CodeDecorator;
import org.jboss.errai.ioc.rebind.ioc.IOCDecoratorExtension;
import org.jboss.errai.ioc.rebind.ioc.InjectableInstance;
import org.jboss.errai.ioc.rebind.ioc.InjectionContext;
import org.jboss.errai.ioc.rebind.ioc.codegen.Statement;
import org.jboss.errai.ioc.rebind.ioc.codegen.meta.MetaClass;
import org.jboss.errai.ioc.rebind.ioc.codegen.meta.MetaClassFactory;
import org.jboss.errai.ioc.rebind.ioc.codegen.util.Stmt;

@CodeDecorator
public class ServiceIOCExtension extends IOCDecoratorExtension<Service> {
  public ServiceIOCExtension(Class<Service> decoratesWith) {
    super(decoratesWith);
  }

  @Override
  public Statement generateDecorator(InjectableInstance<Service> decContext) {
    final InjectionContext ctx = decContext.getInjectionContext();

    /**
     * Ensure the the container generates a stub to internally expose the field if it's private.
     */
    decContext.ensureMemberExposed();

    /**
     * Get an instance of the message bus.
     */
    final MetaClass busClass = MetaClassFactory.get(decContext.getInjectionContext()
            .getProcessingContext().loadClassType(MessageBus.class));

    final Statement busHandle = ctx.getInjector(busClass).getType(ctx, decContext);

    /**
     * Figure out the service name;
     */
    final String svcName = decContext.getAnnotation().value().equals("")
            ? decContext.getMemberName() : decContext.getAnnotation().value();

    return Stmt.nestedCall(busHandle)
            .invoke("subscribe", svcName, decContext.getValueStatement());
  }
}
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