/*

  * Licensed to the Apache Software Foundation (ASF) under one

  * or more contributor license agreements.  See the NOTICE file

  * distributed with this work for additional information

  * regarding copyright ownership.  The ASF licenses this file

  * to you 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.apache.myfaces.spi.impl;

 import java.util.List;

 import java.util.logging.Level;

 import java.util.logging.Logger;

 import javax.faces.context.ExternalContext;

 import org.apache.myfaces.shared.util.ClassUtils;

 import org.apache.myfaces.spi.ServiceProviderFinderFactory;

 /**

  * Utils for SPI implementations.

  *

  * @since 2.0.3

  * @author Leonardo Uribe

  */

 public final class SpiUtils

 {

     public static Object build(ExternalContext ectx, Class spiClass, String defaultImpl)

     {

         List<String> classList = ServiceProviderFinderFactory.getServiceProviderFinder(ectx).

                 getServiceProviderList(spiClass.getName());

         if (classList != null && !classList.isEmpty())

         {

             if (classList.size() > 1)

             {

                 getLogger().log(Level.WARNING, "More than one SPI interface for "+spiClass.getName()+

                         " found :" + classList.toString() + ". Setting up the first one found.");

             }

             return ClassUtils.newInstance(classList.get(0));

         }

         return ClassUtils.newInstance(defaultImpl);

     }

     private static Logger getLogger()

     {

         return Logger.getLogger(SpiUtils.class.getName());

     }

 }