code: @Override
  	public Map<RuleSet, List<Rule>> matching(Rules rules,
  	                                         Map<String, Object> vars,
  	                                         boolean ignoreMethodErrors) throws OgnlException
  	{
  		Map<RuleSet, List<Rule>> ret = new HashMap<>();
  
  		for (RuleSet ruleSet : rules.ruleSets)
  		{
  			try
  			{
  				OgnlContext context = createContext(vars);
  
  				List<Rule> matching = match(ruleSet, context);
  
  				if (!matching.isEmpty())
  				{
  					ret.put(ruleSet, matching);
  				}
  			}
  			catch (MethodFailedException mfe)
  			{
  
  				if (!ignoreMethodErrors)
  				{
  					throw mfe;
  				}
  
  				log.warn("Method failed for ruleset " + ruleSet.id, mfe);
  			}
  		}
  
  		return ret;
  	}
docs: returns a list of the rules that match from the supplied Rules document
  
  @param rules
  
  @return