/*

  * Copyright 2004-2010 the Seasar Foundation and the Others.

  *

  * 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.seasar.cubby.plugins.spring.spi;

 import org.seasar.cubby.spi.ContainerProvider;

 import org.seasar.cubby.spi.container.Container;

 import org.seasar.cubby.spi.container.LookupException;

 import org.springframework.beans.factory.BeanFactoryUtils;

 import org.springframework.context.ApplicationContext;

 import org.springframework.context.ApplicationContextAware;

 /**

  * {@link ApplicationContext} による {@link Container} の実装を提供します。

  * 

  * @author suzuki-kei

  * @author someda

  */

 public class SpringContainerProvider implements ContainerProvider,

                 ApplicationContextAware {

         /** コンテナ。 */

         private Container container;

         /**

          * {@inheritDoc}

          */

         public Container getContainer() {

                 return container;

         }

         /**

          * アプリケーションコンテキストを設定します。

          * 

          * @param applicationContext

          *            アプリケーションコンテキスト

          */

         public void setApplicationContext(

                         final ApplicationContext applicationContext) {

                 this.container = new SpringContainerImpl(applicationContext);

         }

         /**

          * {@link ApplicationContext} による {@link Container} の実装です。

          */

         private static class SpringContainerImpl implements Container {

                 private final ApplicationContext applicationContext;

                 public SpringContainerImpl(final ApplicationContext applicationContext) {

                         this.applicationContext = applicationContext;

                 }

                 public <T> T lookup(final Class<T> type) throws LookupException {

                         String[] names = BeanFactoryUtils

                                         .beanNamesForTypeIncludingAncestors(applicationContext,

                                                         type);

                         if (names == null || names.length < 1) {

                                 throw new LookupException(type + " component not found.");

                         }

                         return type.cast(applicationContext.getBean(names[0], type));

                 }

         }

 }