Streamx has a line of products offering Java fluent interface to other languages. The key differentiator is natural Java integration, since we "recompile - transpile" Java Byte Code to target language (e.g. Cypher). As a result, there is no semantic gaps and learning curve is short. Using our technology, the Cypher queries over OGM would look like this (see OGM type declarations):
public Map<String, Object> getDirectorAndMovies(String name,
String title,
int someYear) {
// Query variables are clearly defined as Lambda parameters
FluentQuery query = FluentGQL.cypher((Person p,
Movie movie,
Movie otherMovie) -> {
// "title" parameter is automatically captured
movie = properties(movie, entry(movie::getTitle, title));
// Labels and Relationship types are automatically calculated.
// The user fully enjoys Java type safety and auto completion.
//
// We decided to be very clear and type-safe in the common case:
// i.e. since getDirectedMovies() returns a Set<Movie>,
// to() accepts only Movie instance (compiler verified)
MATCH(from(p).byMany(p::getDirectedMovies).to(movie), from(p).byMany(p::getWroteMovies).to(otherMovie));
// "name" and "someYear" parameters are automatically captured.
// the condition is written as a normal business logic Java expression,
// using standard getters, operators, String methods etc
WHERE(p.getName().matches(name) && p.getBorn() < someYear);
RETURN(p, otherMovie);
});
// returns the resulting Cypher statement
// query.toString();
// returns captured parameters Map
// query.parameters();
// now we can
return client.query(query.toString()).bindAll(query.parameters()).fetch().all();
}The query.toString() returns the following statement:
MATCH (e0:Person) - [:DIRECTED] -> (e1:Movie {title: $p0}), (e0) - [:WROTE] -> (e2:Movie)
WHERE e0.name =~ $p1
AND e0.born < $p2
RETURN e0, e2The actual compiling code can be inspected here + few additional examples. You may also want to look at our JPA product, which lets write in Java practically any SQL query on top of JPA entities. The code is open source, so you may examine the usability, quality and completeness.
This project demoes what we can achieve. At the moment there is no implementation behind. Please contact me, I would be very happy to hear what you think about this idea.