Method compareTrees

src/main/java/club/qqtim/diff/DiffUtil.java:119–131

given trees, return path, object ids @param trees compare trees @return key path, val objectIds

(Map<String, String>... trees)

     * @return key path, val objectIds
     */
    @SafeVarargs
    public static Map<String, List<String>> compareTrees(Map<String, String>... trees) {
        Map<String, List<String>> entries = new HashMap<>(1);
        for (int i = 0; i < trees.length; i++) {
            for (Map.Entry<String, String> entry : trees[i].entrySet()) {
                String path = entry.getKey();
                String objectId = entry.getValue();
                entries.putIfAbsent(path, new ArrayList<>(Collections.nCopies(trees.length, null)));
                entries.get(path).set(i, objectId);
            }
        }
        return entries;
    }

    /**
     * key: path val: blob content