Method writeTree

src/main/java/club/qqtim/command/WriteTree.java:43–78

init the indexAsTree to visual tree @return tree Id

()

     * @return tree Id
     */
    private String writeTree() {
        // read the index dict
        final String indexContent = FileUtil.getFileAsString(ConstantVal.INDEX, ConstantVal.NONE);
        Map<String, String> indexItems = new Gson().fromJson(indexContent, new TypeToken<Map<String, String>>(){}.getType());


        /* construct the tree map called indexAsTree like the below
          {
            java: {                      =>   val is map     =>  tree
               com: {                    =>   val is map     =>  tree
                   file1: objectId       =>   val is string  =>  object
                   club: {               =>   val is map     =>  tree
                       file2: objectId   =>   val is string  =>  object
                   }
               }
          }

         */
        Map<String, Object> indexAsTree = new HashMap<>();
        for (Map.Entry<String, String> pathObjectId : indexItems.entrySet()) {
            String path = pathObjectId.getKey();
            String objectId = pathObjectId.getValue();
            List<String> pathAndFile = Arrays.asList(path.split("/"));
            List<String> dirPaths = pathAndFile.subList(0, pathAndFile.size() - 1);
            String fileName = pathAndFile.get(pathAndFile.size() - 1);

            Map<String, Object> current = indexAsTree;
            for (String dirPath : dirPaths) {
                current = (Map<String, Object>) current.computeIfAbsent(dirPath, e -> new HashMap<>());
            }
            current.put(fileName, objectId);
        }

        // write objects into zit repository with the reference of above tree
        return writeTreeRecursive(indexAsTree);
    }

    /**
     * this is an easy dfs for writing objects and trees