code: @Override
  	protected AbstractChainedGlobalProcessor<GlobalPreprocessingContext> buildProcessorByKey(String key) {
  
  		AbstractChainedGlobalProcessor<GlobalPreprocessingContext> processor = null;
  
  		if (key.equals(JawrConstant.GLOBAL_CSS_SMARTSPRITES_PREPROCESSOR_ID)) {
  			processor = new CssSmartSpritesGlobalPreprocessor();
  		}
  
  		return processor;
  	}
docs: /*
  (non-Javadoc)
  
  @see net.jawr.web.resource.bundle.global.processor.
  AbstractGlobalProcessorChainFactory#buildProcessorByKey(java.lang.String)