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The private implementation classes of the Apache MyFaces Core JSF-2.1 Implementation
/*
* 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 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());
}
}