How to use

lookupProviders

method

in

org.geotools.factory.FactoryRegistry

  /**
   * This method uses the current classpath to look for instances of  {@link
   * ServiceFactory} using the factory spi mechanism.
   * <p>
   * Sublcasses should overide this method if they  wish to use a diffent plug-in mechanism.
   * </p>
   * 
   * @return A list of ServiceFactory plugins, or an empty list if none
   *         could be found.
   * 
   * @see FactoryRegistry
   */
  public List getServiceFactories() {
    Iterator f = FactoryRegistry.lookupProviders( ServiceFactory.class );
    
    ArrayList factories = new ArrayList();
    while( f.hasNext() ) factories.add( f.next() );
    
    return factories;
  }
}

newServices |= register(lookupProviders(category, loader), category, message);
newServices |= registerFromSystemProperty(loader, category, message);

/**
 * Is the factory picked up from
 * {@code META-INF/services/org.geotools.filter.expression.PropertyAccessorFactory}
 */
@Test
public void testLowLevelSPI() {
  Iterator<PropertyAccessorFactory> factories;
  factories = FactoryRegistry.lookupProviders(PropertyAccessorFactory.class);
  while (factories.hasNext()) {
    PropertyAccessorFactory factory = factories.next();
    if (factory instanceof ExtraDataPropertyAccessorFactory) {
      assertTrue(true);
      return;
    }
  }
  fail(ExtraDataPropertyAccessorFactory.class.getName() + " not found");
}

newServices |= register(lookupProviders(category, loader), category, message);
newServices |= registerFromSystemProperty(loader, category, message);