code: @Override
  	public InputStream createResourceAsStream(GeneratorContext context) {
  
  		InputStream is = null;
  		if (FileNameUtils.hasImageExtension(context.getPath())) {
  			is = helper.createStreamResource(context);
  		}
  
  		return is;
  	}
docs: /*
  (non-Javadoc)
  
  @see net.jawr.web.resource.bundle.generator.StreamResourceGenerator#
  createResourceAsStream
  (net.jawr.web.resource.bundle.generator.GeneratorContext)