in src/main/java/org/apache/sling/javax/activation/internal/OsgiMailcapCommandMap.java [141:161]
    private void getAllCommands(String mimeType, List<CommandInfo> accumulator, boolean fallback) {
        for (Map.Entry<Bundle, MailcapFile> entry : db.entrySet()) {
            Map<?, ?> commandMap = fallback ? entry.getValue().getMailcapFallbackList(mimeType) :
                    entry.getValue().getMailcapList(mimeType);
            if (commandMap == null) {
                continue;
            }
            for (Object verbAsObject : commandMap.keySet()) {
                String verb = (String) verbAsObject;
                List<?> commands = (List<?>) commandMap.get(verb);
                for (Object command : commands) {
                    accumulator.add(new CommandInfo(verb, (String) command));
                }
            }
        }
    }