commonsrdf-commits mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From st...@apache.org
Subject incubator-commonsrdf git commit: updated example from introduction.html
Date Mon, 21 Nov 2016 14:05:40 GMT
Repository: incubator-commonsrdf
Updated Branches:
  refs/heads/master c6c4cbfcf -> 1f19fd831


updated example from introduction.html


Project: http://git-wip-us.apache.org/repos/asf/incubator-commonsrdf/repo
Commit: http://git-wip-us.apache.org/repos/asf/incubator-commonsrdf/commit/1f19fd83
Tree: http://git-wip-us.apache.org/repos/asf/incubator-commonsrdf/tree/1f19fd83
Diff: http://git-wip-us.apache.org/repos/asf/incubator-commonsrdf/diff/1f19fd83

Branch: refs/heads/master
Commit: 1f19fd831f13e5e1a443719b2a9a0e38ba8f0e99
Parents: c6c4cbf
Author: Stian Soiland-Reyes <stain@apache.org>
Authored: Mon Nov 21 14:05:28 2016 +0000
Committer: Stian Soiland-Reyes <stain@apache.org>
Committed: Mon Nov 21 14:05:28 2016 +0000

----------------------------------------------------------------------
 examples/src/example/IntroToRDF.java | 176 +++++++++++++++++++++---------
 1 file changed, 122 insertions(+), 54 deletions(-)
----------------------------------------------------------------------


http://git-wip-us.apache.org/repos/asf/incubator-commonsrdf/blob/1f19fd83/examples/src/example/IntroToRDF.java
----------------------------------------------------------------------
diff --git a/examples/src/example/IntroToRDF.java b/examples/src/example/IntroToRDF.java
index 0aa97f0..58aea85 100644
--- a/examples/src/example/IntroToRDF.java
+++ b/examples/src/example/IntroToRDF.java
@@ -20,60 +20,128 @@ package example;
 import org.apache.commons.rdf.api.*;
 import org.apache.commons.rdf.simple.SimpleRDF;
 
+/** See http://commonsrdf.incubator.apache.org/introduction.html
+ */
 public class IntroToRDF {
     public static void main(String[] args) {
-        RDF rdf = new SimpleRDF();
-
-        IRI alice = rdf.createIRI("Alice");
-        System.out.println(alice.ntriplesString());
-
-        IRI knows = rdf.createIRI("knows");
-        IRI bob = rdf.createIRI("Bob");
-
-        Triple aliceKnowsBob = rdf.createTriple(alice, knows, bob);
-        System.out.println(aliceKnowsBob.getSubject().ntriplesString());
-
-        System.out.println(aliceKnowsBob);
-
-        Graph graph = rdf.createGraph();
-        graph.add(aliceKnowsBob);
-
-        IRI charlie = rdf.createIRI("Charlie");
-
-        IRI plays = rdf.createIRI("plays");
-
-        IRI football = rdf.createIRI("Football");
-        IRI tennis = rdf.createIRI("Tennis");
-
-        graph.add(alice, knows, charlie);
-        graph.add(alice, plays, tennis);
-        graph.add(bob, knows, charlie);
-        graph.add(bob, plays, football);
-        graph.add(charlie, plays, tennis);
-
-        System.out.println("Who plays Tennis?");
-        for (Triple triple : graph.iterate(null, plays, tennis)) {
-            System.out.println(triple.getSubject());
-            System.out.println(plays.equals(triple.getPredicate()));
-            System.out.println(tennis.equals(triple.getObject()));
-        }
-
-        System.out.println("Who does Alice know?");
-        for (Triple triple : graph.iterate(alice, knows, null)) {
-            System.out.println(triple.getObject());
-        }
-
-
-        System.out.println("Does Alice anyone that plays Football?");
-        for (Triple triple : graph.iterate(alice, knows, null)) {
-            RDFTerm aliceFriend = triple.getObject();
-            if (! (aliceFriend instanceof BlankNodeOrIRI)) {
-                continue;
-            }
-            if (graph.contains( (BlankNodeOrIRI)aliceFriend, plays, football)) {
-                System.out.println("Yes, " + aliceFriend);
-            }
-        }
-
-    }
+      RDF rdf = new SimpleRDF();
+
+      IRI alice = rdf.createIRI("Alice");
+      System.out.println(alice.ntriplesString());
+
+      IRI knows = rdf.createIRI("knows");
+      IRI bob = rdf.createIRI("Bob");
+
+      Triple aliceKnowsBob = rdf.createTriple(alice, knows, bob);
+      System.out.println(aliceKnowsBob.getSubject().ntriplesString());
+
+      System.out.println(aliceKnowsBob);
+
+      Graph graph = rdf.createGraph();
+      graph.add(aliceKnowsBob);
+
+      IRI charlie = rdf.createIRI("Charlie");
+
+      IRI plays = rdf.createIRI("plays");
+
+      IRI football = rdf.createIRI("Football");
+      IRI tennis = rdf.createIRI("Tennis");
+
+      graph.add(alice, knows, charlie);
+      graph.add(alice, plays, tennis);
+      graph.add(bob, knows, charlie);
+      graph.add(bob, plays, football);
+      graph.add(charlie, plays, tennis);
+
+      System.out.println("Who plays Tennis?");
+      for (Triple triple : graph.iterate(null, plays, tennis)) {
+          System.out.println(triple.getSubject());
+          System.out.println(plays.equals(triple.getPredicate()));
+          System.out.println(tennis.equals(triple.getObject()));
+      }
+
+      System.out.println("Who does Alice know?");
+      for (Triple triple : graph.iterate(alice, knows, null)) {
+          System.out.println(triple.getObject());
+      }
+
+
+      System.out.println("Does Alice anyone that plays Football?");
+      for (Triple triple : graph.iterate(alice, knows, null)) {
+          RDFTerm aliceFriend = triple.getObject();
+          if (! (aliceFriend instanceof BlankNodeOrIRI)) {
+              continue;
+          }
+          if (graph.contains( (BlankNodeOrIRI)aliceFriend, plays, football)) {
+              System.out.println("Yes, it is " + aliceFriend);
+          }
+      }
+
+      Literal aliceName = rdf.createLiteral("Alice W. Land");
+      IRI name = rdf.createIRI("name");
+      graph.add(alice, name, aliceName);
+
+      Optional<? extends Triple> nameTriple = graph.stream(alice, name, null).findAny();
+      if (nameTriple.isPresent()) {
+          System.out.println(nameTriple.get());
+      }
+
+
+      graph.stream(alice, name, null)
+              .findAny().map(Triple::getObject)
+              .filter(obj -> obj instanceof Literal)
+              .map(literalName -> ((Literal)literalName).getLexicalForm())
+              .ifPresent(System.out::println);
+
+      IRI playerRating = rdf.createIRI("playerRating");
+      Literal aliceRating = rdf.createLiteral("13.37", Types.XSD_FLOAT);
+      graph.add(alice, playerRating, aliceRating);
+
+      Literal footballInEnglish = rdf.createLiteral("football", "en");
+      Literal footballInNorwegian = rdf.createLiteral("fotball", "no");
+      graph.add(football, name, footballInEnglish);
+      graph.add(football, name, footballInNorwegian);
+
+      Literal footballInAmericanEnglish = rdf.createLiteral("soccer", "en-US");
+      graph.add(football, name, footballInAmericanEnglish);
+
+      BlankNode someone = rdf.createBlankNode();
+      graph.add(charlie, knows, someone);
+      graph.add(someone, plays, football);
+
+      BlankNode someoneElse = rdf.createBlankNode();
+      graph.add(charlie, knows, someoneElse);
+
+      for (Triple heKnows : graph.iterate(charlie, knows, null)) {
+          if (! (heKnows.getObject() instanceof BlankNodeOrIRI)) {
+              continue;
+          }
+          BlankNodeOrIRI who = (BlankNodeOrIRI)heKnows.getObject();
+          System.out.println("Charlie knows "+ who);
+          for (Triple whoPlays : graph.iterate(who, plays, null)) {
+              System.out.println("  who plays " + whoPlays.getObject());
+          }
+      }
+
+      // Delete previous BlankNode statements
+      graph.remove(null,null,someone);
+      graph.remove(someone,null,null);
+
+      // no Java variable for the new BlankNode instance
+      graph.add(charlie, knows, rdf.createBlankNode("someone"));
+      // at any point later (with the same RDF instance)
+      graph.add(rdf.createBlankNode("someone"), plays, football);
+
+      for (Triple heKnows : graph.iterate(charlie, knows, null)) {
+          if (! (heKnows.getObject() instanceof BlankNodeOrIRI)) {
+              continue;
+          }
+          BlankNodeOrIRI who = (BlankNodeOrIRI)heKnows.getObject();
+          System.out.println("Charlie knows "+ who);
+          for (Triple whoPlays : graph.iterate(who, plays, null)) {
+              System.out.println("  who plays " + whoPlays.getObject());
+          }
+      }
+
+  }
 }


Mime
View raw message