A swisspost project

super-machine

Query Java object graphs in a typed and streamed fashion

What about:

from(invoice).
  .find(Article.class)
  .filter(article -> article.getType().equals("hardware")
  .extract(Article::getVendor)
  .filter(vendor -> !vendor.getName().equals("Apple")
  .find(Office.class)
  .then( 
    (offices -> offices.extract(Office::getCity)),
    (offices -> offices.find(Person.class).extract(Person::getFullName)))
  .stream()

Returns the name of employees and city name of the offices of non-Apple vendors that sells hardware article on this invoice.

find traverses the object graph to find all occurences in properties, maps and collections. In the example above, the structure could be:

Invoice
   |
   | *
 Lines  --- Article
               | *
               |
             Vendor
               | *
               |
            Company
               |
               | *
             Office --- Staff --- * Employee --- Person

Nice?