sparql-streamline's Introduction

SPARQL streamline

A jena-wrapper for using SPARQL out of the box in your code.

Maven install

Import in your pom.xml the following dependency

<dependency>
    <groupId>io.github.andreacimminoarriaga</groupId>
    <artifactId>sparql-streamline</artifactId>
    <version>0.1.5</version>
</dependency>

Quick start

For interacting with a SPARQL endpoint first it has to be configured. Next excerpt shows how to set up a Graph DB with a repo named test and with security enabled (username is rootand password is toor):

SparqlEndpointConfiguration configuration = new SparqlEndpointConfiguration();
configuration.setEndpointQuery("http://localhost:7200/repositories/test");
// Set update endpoint when you need to write data in the triple store
configuration.setEndpointUpdate("http://localhost:7200/repositories/test/statements");
// Set credentials only when the triple store has security enabled, leave as null oterwhise.
configuration.setUsername("root");
configuration.setPassword("toor");

Once the SPARQl endpoint is configured, it can be accessed for either query or write.

SparqlEndpoint endpoint = **new** SparqlEndpoint(sec);

// Querying the endpoint
String query = "SELECT * { ?s a ?t }"; // SELECT, ASK, CONSTRUCT, or DESCRIBE queries
// The ResultsFormat class is an enum containing all the possible result serialisations
ByteArrayOutputStream result = endpoint.query(query, ResultsFormat.FMT_RS_CSV) ;
// method query() can also receive a base namespace as third argument

// Updating the endpoint
String update = "CLEAR ALL" // UPDATE queries
endpoint.update(update);

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