/*

  * 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.application.impl;

 import java.util.ArrayList;

 import java.util.Iterator;

 import java.util.List;

 import org.seasar.framework.util.StringUtil;

 import org.seasar.teeda.core.JsfConstants;

 import org.seasar.teeda.core.application.ComponentLookupStrategy;

 import org.seasar.teeda.core.util.DIContainerUtil;

 /**

  * @author shot

  */

 public class DefaultComponentLookupStrategy implements ComponentLookupStrategy {

     private List namespaces = new ArrayList();

     public DefaultComponentLookupStrategy() {

         namespaces.add(JsfConstants.TEEDA_NAMESPACE);

     }

     public Object getComponentByName(String componentName) {

         if (StringUtil.isEmpty(componentName)) {

             throw new IllegalArgumentException();

         }

         Object component = DIContainerUtil

                 .getComponentNoException(componentName);

         if (component != null) {

             return component;

         }

         for (Iterator itr = namespaces.iterator(); itr.hasNext();) {

             String namespace = (String) itr.next();

             component = getComponentByDefaultNamespace(namespace, componentName);

             if (component != null) {

                 return component;

             }

         }

         return null;

     }

     public Object getComponentByClass(Class componentClazz) {

         if (componentClazz == null) {

             throw new IllegalArgumentException();

         }

         return DIContainerUtil.getComponentNoException(componentClazz);

     }

     public void addNamespace(String namespace) {

         if (!StringUtil.isEmpty(namespace)) {

             this.namespaces.add(namespace);

         }

     }

     private Object getComponentByDefaultNamespace(String namespace,

             String componentName) {

         final String key = new String(new StringBuffer(namespace.length()

                 + componentName.length() + 1).append(namespace).append(

                 JsfConstants.NS_SEP).append(componentName));

         return DIContainerUtil.getComponentNoException(key);

     }

 }