package org.codehaus.mojo.natives.manager;
   
   import java.util.HashMap;
   import java.util.Map;
   
   import org.codehaus.mojo.natives.EnvFactory;
   import org.codehaus.mojo.natives.NativeBuildException;
   import org.codehaus.plexus.component.annotations.Component;
   
  /**
   * Construct EnvFactory
   */
  @Component(role = EnvFactoryManager.class, hint = "default", instantiationStrategy = "singleton")
  public class DefaultEnvFactoryManager
      implements EnvFactoryManager
  {
      private Map envFactoryCache = new HashMap();
  
      public EnvFactory getEnvFactory( String className )
          throws NativeBuildException
      {
          EnvFactory envFactory = (EnvFactory) envFactoryCache.get( className );
  
          if ( envFactory == null )
          {
              try
              {
                  envFactory = (EnvFactory) Class.forName( className ).newInstance();
                  envFactoryCache.put( className, envFactory );
              }
              catch ( Exception e )
              {
                  throw new NativeBuildException( "Unable to find EnvFactory: " + className );
              }
          }
  
          return envFactory;
  
      }
  
  }