/*

  * Copyright 2004-2011 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.teeda.core.util;

 import java.util.ArrayList;

 import java.util.List;

 import org.seasar.framework.container.ComponentDef;

 import org.seasar.framework.container.S2Container;

 import org.seasar.framework.container.factory.SingletonS2ContainerFactory;

 import org.seasar.framework.log.Logger;

 public class DIContainerUtil {

     private static final Logger logger_ = Logger

             .getLogger(DIContainerUtil.class);

     private DIContainerUtil() {

     }

     public static Object getComponentNoException(Object componentKey) {

         S2Container container = getContainer();

         if (container == null) {

             return null;

         }

         if (container.hasComponentDef(componentKey)) {

             return container.getComponent(componentKey);

         }

         return null;

     }

     public static ComponentDef getComponentDefNoException(Object componentKey) {

         if (getContainer().hasComponentDef(componentKey)) {

             return getContainer().getComponentDef(componentKey);

         }

         return null;

     }

     public static Object getComponent(Object componentKey) {

         return getContainer().getComponent(componentKey);

     }

     public static synchronized void register(ComponentDef componentDef) {

         if (logger_.isDebugEnabled()) {

             logger_.debug("componentDef name  = "

                     + componentDef.getComponentName());

             logger_.debug("componentDef class = "

                     + componentDef.getComponentClass());

         }

         getContainer().register(componentDef);

     }

     public static Object[] getComponentKeys(Class clazz) {

         ComponentDef[] componentDefs = getContainer().findComponentDefs(clazz);

         List list = new ArrayList();

         for (int i = 0; i < componentDefs.length; i++) {

             ComponentDef componentDef = componentDefs[i];

             list.add(componentDef.getComponentName());

         }

         return list.toArray();

     }

     public static boolean hasComponent(Object componentKey) {

         return getContainer().hasComponentDef(componentKey);

     }

     public static boolean hasContainer() {

         return SingletonS2ContainerFactory.hasContainer();

     }

     private static final Object[] EMPTY = new Object[0];

     public static Object[] findAllComponents(Object componentKey) {

         if (!hasContainer()) {

             return EMPTY;

         }

         return getContainer().findAllComponents(componentKey);

     }

     public static S2Container getContainer() {

         return SingletonS2ContainerFactory.getContainer();

     }

 }