001    /**
002     * Licensed to the Apache Software Foundation (ASF) under one or more
003     * contributor license agreements.  See the NOTICE file distributed with
004     * this work for additional information regarding copyright ownership.
005     * The ASF licenses this file to You under the Apache License, Version 2.0
006     * (the "License"); you may not use this file except in compliance with
007     * the License.  You may obtain a copy of the License at
008     *
009     *      http://www.apache.org/licenses/LICENSE-2.0
010     *
011     * Unless required by applicable law or agreed to in writing, software
012     * distributed under the License is distributed on an "AS IS" BASIS,
013     * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014     * See the License for the specific language governing permissions and
015     * limitations under the License.
016     */
017    package org.apache.xbean.server.spring.reference;
018    
019    import java.io.Serializable;
020    
021    import org.apache.xbean.kernel.ServiceContext;
022    import org.apache.xbean.kernel.ServiceContextThreadLocal;
023    import org.apache.xbean.kernel.ServiceName;
024    import org.springframework.beans.factory.FactoryBean;
025    import org.springframework.beans.factory.config.BeanDefinitionHolder;
026    import org.springframework.beans.factory.support.RootBeanDefinition;
027    
028    /**
029     * ServiceNameReference is a the ServiceName in the ServiceContextThreadLocal.
030     * @author Dain Sundstrom
031     * @version $Id$
032     * @since 2.0
033     */
034    public class ServiceNameReference implements FactoryBean, Serializable {
035        /**
036         * Creates a bean definition for ServiceNameReference.
037         * @return a bean definition for ServiceNameReference
038         */
039        public static BeanDefinitionHolder createBeanDefinition() {
040            RootBeanDefinition beanDefinition = new RootBeanDefinition(ServiceNameReference.class, 0);
041            return new BeanDefinitionHolder(beanDefinition, ServiceNameReference.class.getName());
042        }
043    
044        public final Class getObjectType() {
045            return ServiceName.class;
046        }
047    
048        public synchronized final Object getObject() {
049            ServiceContext serviceContext = ServiceContextThreadLocal.get();
050            if (serviceContext == null) {
051                throw new IllegalStateException("Service context has not been set");
052            }
053            return serviceContext.getServiceName();
054        }
055    
056        public boolean isSingleton() {
057            return true;
058        }
059    }