Seraph query parser

An ANTLR4 parser for Seraph continuous graph queries.

This project is still under development.

Syntax

The syntax of Seraph extends the syntax of Cypher 9 as follows:

Usage example

Example query

REGISTER QUERY <query_name> STARTING AT 2019-09-07T15:50:30.022+01:00 {
MATCH (a) - [b] -> (c) WITHIN PT1H WHERE a = 1 OR b = 2
RETURN c
ON EXIT 
EVERY PT10M }

Resulting CQ-Object

  id = <query_name>
  starting_time = 2019-09-07T15:50:30.022+01:00
  match_clause:
      pattern = (a) - [b] -> (c)
      range = PT1H
      expression = a = 1 OR b = 2
  return_clause:
      expression = c
  stream_operator = ON EXIT
  range = PT10M

Using Java Methods

Create ContinuousQuery:

ContinuousQuery myQuery = QueryFactory.parse(queryString);

Get ID of ContinuousQuery:

myQuery.getId();    // <query_name>

Get match clause of ContinuousQuery:

ArrayList<MatchClause> matchClauses = myQuery.getMatchClauses();
matchClauses.get(0).getPattern();           // (a) - [b] -> (c)
matchClauses.get(0).getDuration();          // PT1H
matchClauses.get(0).getWhereExpression();   // a = 1 OR b = 2

Further application examples can be found in the Example class.

License

Licensed under the Apache License, Version 2.0.