From 9dde8ddba4a2bc3342ed9a81c2d6d68269511f4e Mon Sep 17 00:00:00 2001
From: Valerian Wintner <v.d.w@hotmail.com>
Date: Sat, 27 Nov 2021 19:56:31 +0100
Subject: [PATCH] Query: Option to only get properties belonging to this class,
to the superclass, or everything.
---
.../src/main/java/com/kgshape/app/Query.java | 109 +++++++++++++++---
1 file changed, 94 insertions(+), 15 deletions(-)
diff --git a/framework/src/main/java/com/kgshape/app/Query.java b/framework/src/main/java/com/kgshape/app/Query.java
index 21932e3..39aadd3 100644
--- a/framework/src/main/java/com/kgshape/app/Query.java
+++ b/framework/src/main/java/com/kgshape/app/Query.java
@@ -1,15 +1,15 @@
package com.kgshape.app;
-import java.io.FileOutputStream;
-import java.io.IOException;
-import java.nio.file.FileSystemNotFoundException;
-
import org.apache.jena.query.QueryExecution;
import org.apache.jena.query.QueryExecutionFactory;
import org.apache.jena.rdf.model.Model;
import org.apache.jena.riot.Lang;
import org.apache.jena.riot.RDFDataMgr;
+import java.io.FileOutputStream;
+import java.io.IOException;
+import java.nio.file.FileSystemNotFoundException;
+
/**
* Queries a remote endpoint.
*/
@@ -22,20 +22,81 @@ public class Query {
PREFIX o: <http://dbpedia.org/ontology/>
select distinct ?subj where {?subj a o:Language} LIMIT 20
""";
- // Get 100 different actors
- String construct_query = """
+
+ String format_construct_all = """
PREFIX o: <http://dbpedia.org/ontology/>
- CONSTRUCT {?person ?pred ?obj}
+ PREFIX rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#>
+ PREFIX rdfs: <http://www.w3.org/2000/01/rdf-schema#>
+ CONSTRUCT {
+ ?subj ?pred ?obj.
+ }
WHERE {
- ?person ?pred ?obj
- {
- SELECT DISTINCT(?person)
- WHERE {
- ?person a o:Actor
- } LIMIT 100
- }
+ ?subj ?pred ?obj.
+ {
+ SELECT DISTINCT(?subj)
+ WHERE {
+ ?subj a o:%1$s
+ } LIMIT 100
+ }
}
""";
+
+ String format_construct = """
+ PREFIX o: <http://dbpedia.org/ontology/>
+ PREFIX rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#>
+ PREFIX rdfs: <http://www.w3.org/2000/01/rdf-schema#>
+ CONSTRUCT {
+ ?subj ?pred ?obj.
+ ?subj a o:%1$s.
+ }
+ WHERE {
+ ?subj ?pred ?obj.
+ {
+ SELECT DISTINCT(?subj)
+ WHERE {
+ ?subj a o:%1$s
+ } LIMIT 100
+ }
+ {
+ SELECT DISTINCT ?pred WHERE {
+ ?pred rdfs:domain o:%1$s.
+ }
+ }
+ }
+ """;
+ String format_construct_super = """
+ PREFIX o: <http://dbpedia.org/ontology/>
+ PREFIX rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#>
+ PREFIX rdfs: <http://www.w3.org/2000/01/rdf-schema#>
+ CONSTRUCT {
+ ?subj ?pred ?obj.
+ ?subj a ?class.
+ }
+ WHERE {
+ ?subj ?pred ?obj.
+ ?subj a ?class.
+ {
+ SELECT DISTINCT(?subj)
+ WHERE {
+ ?subj a o:%1$s
+ } LIMIT 100
+ }
+ {
+ SELECT DISTINCT ?pred WHERE {
+ {
+ ?pred rdfs:domain ?class.
+ }
+ }
+ }
+ {
+ SELECT ?class WHERE {
+ o:%1$s rdfs:subClassOf* ?class.
+ }
+ }
+ }
+ """;
+// System.out.println(construct_query);
+
String construct_query2 = """
PREFIX o: <http://dbpedia.org/ontology/>
PREFIX dbr: <http://dbpedia.org/resource/>
@@ -47,8 +108,26 @@ public class Query {
// You can also open this endpoint in the browser and test the above query
String endpoint = "https://dbpedia.org/sparql";
+ // Pick the name of the class we want to extract from the arguments
+ String className;
+ if (args.length < 1) {
+ className = "Artist";
+ } else {
+ className = args[0];
+ }
+
+
+ String construct_query = String.format(format_construct, className);
Model fetchedModel = fetchConstruct(endpoint, construct_query);
- writeModel(fetchedModel, "rdf_file.ttl");
+ writeModel(fetchedModel, "rdf_" + className + ".ttl");
+
+ String construct_query_super = String.format(format_construct_super, className);
+ fetchedModel = fetchConstruct(endpoint, construct_query_super);
+ writeModel(fetchedModel, "rdf_" + className + "_super.ttl");
+
+ String construct_query_all = String.format(format_construct_all, className);
+ fetchedModel = fetchConstruct(endpoint, construct_query_all);
+ writeModel(fetchedModel, "rdf_" + className + "_all.ttl");
}
public static Model fetchConstruct(String endpoint, String query) {
--
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