# SpringImporter.java

    /*
     * Copyright (c) 2008, Rickard Öberg. All Rights Reserved.
     *
     * 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.qi4j.library.spring.importer;

    import org.qi4j.api.service.ImportedServiceDescriptor;
    import org.qi4j.api.service.ServiceImporter;
    import org.qi4j.api.service.ServiceImporterException;
    import org.springframework.context.ApplicationContext;

    /**
     * Import a service from Spring. This assumes that the service has been imported
     * into the assembly using the SpringImporterAssembler, so that the ApplicationContext
     * is available as service meta-info.
     */
    public class SpringImporter
        implements ServiceImporter
    {
        /**
         * Import a service from Spring by looking it up in the ApplicationContext.
         *
         * @param serviceDescriptor The service descriptor.
         * @return a service instance
         * @throws ServiceImporterException if unable to import the service
         */
        @Override
        public Object importService( ImportedServiceDescriptor serviceDescriptor ) throws ServiceImporterException
        {
            try
            {
                return serviceDescriptor.
                    metaInfo( ApplicationContext.class ).
                    getBean( serviceDescriptor.identity(), serviceDescriptor.type() );
            }
            catch( Throwable e )
            {
                throw new ServiceImporterException( "Could not import Spring service with id " + serviceDescriptor.identity(), e );
            }
        }

        @Override
        public boolean isAvailable( Object instance )
        {
            return true;
        }
    }