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.springframework.beans.factory.FactoryBean;
024    import org.springframework.beans.factory.config.BeanDefinitionHolder;
025    import org.springframework.beans.factory.support.RootBeanDefinition;
026    
027    /**
028     * ServiceNameStringReference is a the ServiceName as a string in the ServiceContextThreadLocal.
029     * @author Dain Sundstrom
030     * @version $Id$
031     * @since 2.0
032     */
033    public class ServiceNameStringReference implements FactoryBean, Serializable {
034        /**
035         * Creates a bean definition for ServiceNameStringReference.
036         * @return a bean definition for ServiceNameStringReference
037         */
038        public static BeanDefinitionHolder createBeanDefinition() {
039            RootBeanDefinition beanDefinition = new RootBeanDefinition(ServiceNameStringReference.class, 0);
040            return new BeanDefinitionHolder(beanDefinition, ServiceNameStringReference.class.getName());
041        }
042    
043        public final Class getObjectType() {
044            return String.class;
045        }
046    
047        public synchronized final Object getObject() {
048            ServiceContext serviceContext = ServiceContextThreadLocal.get();
049            if (serviceContext == null) {
050                throw new IllegalStateException("Service context has not been set");
051            }
052            return serviceContext.getServiceName().toString();
053        }
054    
055        public boolean isSingleton() {
056            return true;
057        }
058    }