maple-dsl,github

A powerful, flexible, lightning-fast graph query DSL

Features

Support popular graph query language (e.g. Cypher, nGQL, etc)
Out-of-the-box dsl interfaces for operate graph database.
Powerful and flexible predicate/selection/traversal/mutation conditional wrapper.
Lambda-style API Lambda

Getting started

Prepare dependency

Inclusion of the Cypher-DSL in a Maven project

<dependency>
  <groupId>io.github.maple-dsl</groupId>
  <artifactId>maple-dsl-cypher</artifactId>
  <version>1.0.3</version>
</dependency>

Inclusion of the Nebula-DSL in a Maven project

<dependency>
  <groupId>io.github.maple-dsl</groupId>
  <artifactId>maple-dsl-nebula</artifactId>
  <version>1.0.3</version>
</dependency>

How to use

Set up domain entities(vertex&edge)

@Label("actor")
class Actor extends Model.V<String> {
  private String name;
}

@Label("movie")
class Movie extends Model.V<String> {
  @Property("movie_name")
  private String name;
  @Property("movie_released")
  private Integer released;
}

@Label("acted_in")
class ActedIn extends Model.E<String,String> {

}

List all Tom Hanks movies released in the 1990s

var match = G.vertex(Actor.class).eq(Actor::getName, "Tom Hanks");
var statement = G.traverse(match)
    .outE(ActedIn.class)
    .outV("tomHanksMovies", Movie.class, it -> it
      .gte(Movie::getReleased, 1990)
      .lt(Movie::getReleased, 2000)
      .select(Movie::getReleased)
      .selectAs(Movie::getName, "movie_name"))
    .render();

or List all the actors that acted with Tom Hanks movies released in the 1990s

statement = G.traverse(match)
    .outE(ActedIn.class)
    .outV("tomHanksMovies", Movie.class, it -> it
      .gte(Movie::getReleased, 1990)
      .lt(Movie::getReleased, 2000)
      .select(Movie::getReleased)
      .selectAs(Movie::getName, "movie_name"))
    .inE(ActedIn.class)
    .outV("otherActors", Actor.class, TraversalStep.Step::selectAll)
    .render();

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