ExceptionAccumulator.java

public Result<FileDto> getFromFile(File f) {

        FileDto dto = new FileDto();
        Result<FileDto> result = new Result<>(dto);
        result.apply(r -> r.setName(f.getName()));
        result.apply(r -> r.setPath(f.getAbsolutePath()));
        result.apply(r -> r.setDirectory(f.isDirectory()));
        result.apply(r -> r.setSize(f.length()));
        result.apply(r -> r.setModifiedAt(f.lastModified()));
        result.apply(r -> {
            BasicFileAttributes attr = Files.readAttributes(f.toPath(), BasicFileAttributes.class);
            dto.setCreatedAt(attr.creationTime().toMillis());
        });

        return result;
    }

    public static class Result<T>
    {
        T result;
        boolean incomplete;
        List<Throwable> reasons = new ArrayList<>();

        public Result(T t)
        {
            result = t;
        }

        public void apply(ExceptionalConsumer<T> consumer)
        {
            try
            {
                consumer.accept(result);
            }
            catch(Throwable e)
            {
                getReasons().add(e);
            }
        }

        public T getResult() {
            return result;
        }

        public void setResult(T result) {
            this.result = result;
        }

        public boolean isIncomplete() {
            return incomplete;
        }

        public void setIncomplete(boolean incomplete) {
            this.incomplete = incomplete;
        }

        public List<Throwable> getReasons() {
            return reasons;
        }

        public static interface ExceptionalConsumer<T>
        {
            public void accept(T object) throws Throwable;
        }
    }