added query tool in Querier class

Author: wiauxb

cwaf-ontology/src/main/java/be/uclouvain/service/Querier.java

@@ -0,0 +1,105 @@
+package be.uclouvain.service;
+
+import org.apache.commons.cli.*;
+import java.io.File;
+import java.io.FileNotFoundException;
+import java.util.Scanner;
+
+import org.apache.jena.ontology.OntModel;
+import org.apache.jena.query.Query;
+import org.apache.jena.query.QueryExecution;
+import org.apache.jena.query.QueryExecutionFactory;
+import org.apache.jena.query.QueryFactory;
+import org.apache.jena.query.ResultSet;
+import org.apache.jena.query.ResultSetFormatter;
+import org.apache.jena.rdf.model.ModelFactory;
+
+public class Querier {
+    
+    public static String loadQueryFromFile(String queryPath) {
+        //Load the query
+        StringBuilder queryString = new StringBuilder();
+        try {
+            File myfile = new File(queryPath);
+            Scanner myReader = new Scanner(myfile);
+            while (myReader.hasNextLine()) {
+                String data = myReader.nextLine();
+                queryString.append(data).append("\n");
+            }
+            myReader.close();
+        } catch (FileNotFoundException e) {
+            System.err.println("Error reading query file: " + e.getMessage());
+            System.exit(1);
+        }
+        return queryString.toString();
+    }
+
+    public static void runFromString(String ontologyPath, String queryString) {
+        //Load the ontology
+        OntModel model = ModelFactory.createOntologyModel();
+        model.read(ontologyPath);
+        
+        //Query
+        Query query = QueryFactory.create(queryString);
+        QueryExecution qexec = QueryExecutionFactory.create(query, model);
+        try {
+            ResultSet results = qexec.execSelect();
+            ResultSetFormatter.out(System.out, results);
+        } finally {
+            qexec.close();
+        }
+    }
+
+    public static void runFromFile(String ontologyPath, String queryPath) {
+        //Query
+        String queryString = loadQueryFromFile(queryPath); 
+        runFromString(ontologyPath, queryString);
+    }
+
+    public static void printHelp(Options options) {
+        HelpFormatter formatter = new HelpFormatter();
+        formatter.printHelp("Querier <ontology path> <query path>", options);
+    }
+    
+    //Do a SPARQL query on the ontology
+    public static void main(String[] args) {
+
+            Options options = new Options();
+            options.addOption("h", "help", false, "print this message");
+            options.addOption("q", "query", true, "Use a string as query instead of a file");
+
+            CommandLineParser parser = new DefaultParser();
+            try {
+                CommandLine cmd = parser.parse(options, args);
+
+                if (cmd.hasOption("h")) {
+                    printHelp(options);
+                } else if (cmd.hasOption("q")){
+                    String ontologyPath = cmd.getArgs()[0];
+                    String queryString = cmd.getOptionValue("q");
+                    runFromString(ontologyPath, queryString);
+                } else {
+                    // Handle the positional argument
+                    String[] remainingArgs = cmd.getArgs();
+                    if (remainingArgs.length != 2) {
+                        System.out.println("Invalid number of arguments");
+                        printHelp(options);
+                        System.exit(1);
+                    }
+                    
+                    String ontologyPath = remainingArgs[0];
+                    String queryPath = remainingArgs[1];
+
+                    runFromFile(ontologyPath, queryPath);
+
+                }
+
+            } catch (ParseException e) {
+                System.err.println("Parsing failed.  Reason: " + e.getMessage());
+                printHelp(options);
+                System.exit(1);
+            }
+
+        
+    }
+}

sparql_query_example.txt

@@ -0,0 +1,14 @@
+PREFIX cwaf: <http://visualdataweb.org/ontCWAF/>
+PREFIX dc:   <http://purl.org/dc/elements/1.1/>
+PREFIX foaf: <http://xmlns.com/foaf/0.1/>
+PREFIX owl:  <http://www.w3.org/2002/07/owl#>
+PREFIX rdf:  <http://www.w3.org/1999/02/22-rdf-syntax-ns#>
+PREFIX rdfs: <http://www.w3.org/2000/01/rdf-schema#>
+PREFIX vs:   <http://www.w3.org/2003/06/sw-vocab-status/ns#>
+PREFIX wot:  <http://xmlns.com/wot/0.1/>
+PREFIX xml:  <http://www.w3.org/XML/1998/namespace>
+PREFIX xsd:  <http://www.w3.org/2001/XMLSchema#>
+SELECT ?s
+WHERE {
+    ?s rdf:type cwaf:Macro .
+}