SPARQLBuilder

Simple Java utility class for building SPARQL queries.

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Description

This class should make writing SPARQL queries easier, more readable and less prone to errors. Also there is prettify feature that prints SPARQL query in much more readable format so it is easier to spot eventual errors.

Usage example

Using plain Java string:

String example1a = "SELECT DISTINCT * FROM <http://dbpedia.org>\n" +
          "WHERE  { \n" +
          "  ?destination a dbo:Park ;\n" +
          "    dbp:name ?name ;\n" +
          "    geo:lat ?lat ;\n" +
          "    geo:long ?long ;\n" +
          "    dbo:thumbnail ?thumbnail ;\n" +
          "    dbp:website ?website ;\n" +
          "    rdfs:comment ?comment ;\n" +
          "    dbo:abstract ?abstract .\n" +
          "  FILTER( lang(?comment)=\"en\" && lang(?abstract)=\"en\") .\n" +
          "}\n" +
          "ORDER BY ?name\n" +
          "LIMIT 10";

Using SPARQLBuilder:

SPARQLBuilder sparqlBuilder = new SPARQLBuilder();
String example1b = sparqlBuilder.startQuery()
          .selectDistinct()
          .from("http://dbpedia.org")
          .startWhere()
              .triplet("destination", "a", "dbo:Park")
              .property("dbp:name").as("name")
              .property("geo:lat").as("lat")
              .property("geo:long").as("long")
              .property("dbo:thumbnail").as("thumbnail")
              .property("foaf:isPrimaryTopicOf").as("wikiLink")
              .property("rdfs:comment").as("comment")
              .property("dbo:abstract").as("abstract")
              .startFilter()
                  .varFunction("lang", "comment").eq("en").and()
                  .varFunction("lang", "abstract").eq("en")
              .endFilter()
          .endWhere()
          .orderBy("name")
          .limit(10)
          .build();

You can even prettify your query like this:

String prettyQuery = sparqlBuilder.prettify();