code: @Override
  	public InputSource resolveNormalized(String identifier) {
  		String fileName = identifier;
  		if (!fileName.endsWith(".css")) {
  			fileName += ".scss";
  		}
  
  		List<Class<?>> excluded = new ArrayList<>();
  		excluded.add(ISassResourceGenerator.class);
  		Reader rd = null;
  		try {
  			rd = rsHandler.getResource(bundle, fileName, false, excluded);
  			FilePathMapping linkedResource = getFilePathMapping(fileName);
  			if (linkedResource != null) {
  				addLinkedResource(linkedResource);
  				if (bundle != null) {
  					bundle.getLinkedFilePathMappings().add(
  							new FilePathMapping(bundle, linkedResource.getPath(), linkedResource.getLastModified()));
  				}
  			}
  		} catch (ResourceNotFoundException e) {
  			// Do nothing
  		}
  
  		if (rd != null) {
  
  			InputSource source = new InputSource();
  			source.setCharacterStream(rd);
  			source.setURI(fileName);
  			return source;
  		} else {
  			return null;
  		}
  	}
docs: /*
  (non-Javadoc)
  
  @see
  com.vaadin.sass.internal.resolver.AbstractResolver#resolveNormalized(java
  .lang.String)