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/*
 * JBoss, Home of Professional Open Source.
 * Copyright 2006, Red Hat Middleware LLC, and individual contributors
 * as indicated by the @author tags. See the copyright.txt file in the
 * distribution for a full listing of individual contributors.
 *
 * This is free software; you can redistribute it and/or modify it
 * under the terms of the GNU Lesser General Public License as
 * published by the Free Software Foundation; either version 2.1 of
 * the License, or (at your option) any later version.
 *
 * This software is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this software; if not, write to the Free
 * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
 * 02110-1301 USA, or see the FSF site: http://www.fsf.org.
 */
package org.jboss.wsf.framework;

import org.jboss.wsf.framework.deployment.DefaultDeploymentAspectManagerFactory;
import org.jboss.wsf.framework.deployment.DefaultDeploymentModelFactory;
import org.jboss.wsf.framework.deployment.DefaultLifecycleHandlerFactory;
import org.jboss.wsf.framework.invocation.DefaultResourceInjectorFactory;
import org.jboss.wsf.framework.management.DefaultEndpointMetricsFactory;
import org.jboss.wsf.framework.management.DefaultEndpointRegistryFactory;
import org.jboss.wsf.framework.management.DefaultJMSEndpointResolver;
import org.jboss.wsf.framework.security.DefaultSecurityAdapterFactory;
import org.jboss.wsf.framework.serviceref.DefaultServiceRefHandlerFactory;
import org.jboss.wsf.spi.SPIProvider;
import org.jboss.wsf.spi.WSFException;
import org.jboss.wsf.spi.deployment.DeploymentAspectManagerFactory;
import org.jboss.wsf.spi.deployment.DeploymentModelFactory;
import org.jboss.wsf.spi.deployment.LifecycleHandlerFactory;
import org.jboss.wsf.spi.invocation.ResourceInjectorFactory;
import org.jboss.wsf.spi.invocation.SecurityAdaptorFactory;
import org.jboss.wsf.spi.management.EndpointMetricsFactory;
import org.jboss.wsf.spi.management.EndpointRegistryFactory;
import org.jboss.wsf.spi.management.JMSEndpointResolver;
import org.jboss.wsf.spi.serviceref.ServiceRefHandlerFactory;
import org.jboss.wsf.spi.util.ServiceLoader;

/**
 * @author Thomas Diesler
 * @author Richard Opalka
 */
class DefaultSPIProvider extends SPIProvider
{

   /**
    * Gets the specified SPI.
    */
   public  T getSPI(Class spiType)
   {
      T returnType = null;

      // SPIs provided by framework, defaults can be overridden
      if (DeploymentAspectManagerFactory.class.equals(spiType))
      {
         returnType = loadService(spiType, DefaultDeploymentAspectManagerFactory.class);
      }
      if (DeploymentModelFactory.class.equals(spiType))
      {
         returnType = loadService(spiType, DefaultDeploymentModelFactory.class);
      }
      else if (EndpointMetricsFactory.class.equals(spiType))
      {
         returnType = loadService(spiType, DefaultEndpointMetricsFactory.class);
      }
      else if (LifecycleHandlerFactory.class.equals(spiType))
      {
         returnType = loadService(spiType, DefaultLifecycleHandlerFactory.class);
      }
      else if (ResourceInjectorFactory.class.equals(spiType))
      {
         returnType = loadService(spiType, DefaultResourceInjectorFactory.class);
      }
      else if (ServiceRefHandlerFactory.class.equals(spiType))
      {
         returnType = loadService(spiType, DefaultServiceRefHandlerFactory.class);
      }
      else if (SecurityAdaptorFactory.class.equals(spiType))
      {
         returnType = loadService(spiType, DefaultSecurityAdapterFactory.class);
      }
      else if (EndpointRegistryFactory.class.equals(spiType))
      {
         returnType = loadService(spiType, DefaultEndpointRegistryFactory.class);
      }
      else if (JMSEndpointResolver.class.equals(spiType))
      {
         returnType = loadService(spiType, DefaultJMSEndpointResolver.class);
      }
      else
      {
         // SPI provided by either container or stack integration that has no default implementation
         returnType = (T)loadService(spiType, null);
      }

      if (returnType == null)
         throw new WSFException("Failed to provide SPI '" + spiType + "'");
      
      return returnType;
   }

   // Load SPI implementation through ServiceLoader
   @SuppressWarnings("unchecked")
   private  T loadService(Class spiType, Class defaultImpl)
   {
      final String defaultImplName = defaultImpl != null ? defaultImpl.getName() : null;
      return (T)ServiceLoader.loadService(spiType.getName(), defaultImplName);
   }

}




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