Examples of spark.api.Solutions

spark.api.Solutions
Cursored access to a sequence of SPARQL solutions. Each solution consists of a set of variables and values. Variables may be unbound in a solution - how this is perceived in the accessors depends on the method and is documented in the method.

For the solution set as a whole, these methods apply:
- {@link #getVariables()}
For the current solution under the cursor, these generic methods can be used to inspect the solution:
- {@link #getResult()} - as map (unbound omitted)
- {@link #getSolutionList()} - as list (unbound are null)
- {@link #getBinding(String)} - get variable's value or null if unbound
- {@link #isBound(String)} - check whether variable is bound in solution
If you have prior knowledge of the return types, these methods can be used to attempt the conversion and simplify your access code (with the caveat that if you are incorrect in your knowledge an exception will be thrown).
- {@link #getNamedNode(String)}
- {@link #getBlankNode(String)}
- {@link #getLiteral(String)}
- {@link #getURI(String)}
- {@link #getString(String)}
- {@link #getInt(String)}
- {@link #getBoolean(String)}
- {@link #getFloat(String)}
- {@link #getDouble(String)}
- {@link #getInteger(String)}
- {@link #getDateTime(String)}

  }
  
  public void helpTestIteratorCount(int rows, int batchSize) {
    DummySherpaServer server = new DummySherpaServer(rows);
    try {
      Solutions solutions = helpExecuteQuery(server, batchSize);
      Iterator<Map<String,RDFNode>> iter = solutions.iterator();
      Assert.assertNotNull(iter);
      List<Map<String,RDFNode>> data = new ArrayList<Map<String,RDFNode>>(rows);
      // Traverse the iterator without calling hasNext()
      for (int i = 0; i < rows; i++) {
        data.add(iter.next());

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            new Object[] { iri(uri2), iri(uri1), toInt(lit2) }
        });
    
    DummySherpaServer server = new DummySherpaServer(data);
    try {
      Solutions s = helpExecuteQuery(server, 5);
      
      Assert.assertTrue(s.next());
      Map<String, RDFNode> solution = s.getResult();
      Assert.assertEquals(3, solution.size());
      Assert.assertEquals(uri1, solution.get("a"));
      Assert.assertEquals(uri2, solution.get("b"));
      Assert.assertEquals(lit1, solution.get("c"));
      
      Assert.assertTrue(s.next());
      Assert.assertEquals(uri2, s.getBinding("a"));
      Assert.assertEquals(uri2, s.getNamedNode("a"));
      Assert.assertEquals(uri1, s.getBinding("b"));
      Assert.assertEquals(uri1.getURI(), s.getURI("b"));
      Assert.assertEquals(lit2, s.getBinding("c"));      
      Assert.assertEquals(lit2, s.getLiteral("c"));      
      Assert.assertEquals(20, s.getInt("c"));
      
      Assert.assertFalse(s.next());
    } finally {
      server.shutdown();
    }
  }

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  private static Solutions getTestData(String testName) throws Exception {
    return getTestData(null, testName);
  }
  
  public void testEmptyResults() throws Exception {
    Solutions s = getTestData("empty-results");
    assertNotNull(s);
    try {
      assertTrue(s instanceof ProtocolResult);
      assertTrue(((ProtocolResult)s).getMetadata().isEmpty());
      
      assertEquals(Arrays.asList("foo", "bar"), s.getVariables());
      
      // Check cursor methods.
      TestCursor.assertCursor(s, BEFORE_FIRST);
      
      // Assert no results.
      assertFalse(s.next());
      
      // Check cursor methods.
      TestCursor.assertCursor(s, AFTER_LAST);
    } finally {
      s.close();
    }
  }

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    }
  }
  
  public void testSingleResult() throws Exception {
    URI u = URI.create("http://example.org/members/Member00004403730");
    Solutions s = getTestData("single-result");
    assertNotNull(s);
    try {
      assertTrue(s instanceof ProtocolResult);
      assertTrue(((ProtocolResult)s).getMetadata().isEmpty());
      
      assertEquals(Arrays.asList("x", "y", "z"), s.getVariables());
      
      // Check cursor methods.
      TestCursor.assertCursor(s, BEFORE_FIRST);
      
      // Check single row
      assertTrue(s.next());
      TestCursor.assertCursor(s, FIRST | LAST);
      assertEquals(new NamedNodeImpl(u), s.getBinding("x"));
      assertEquals(u, s.getURI("x"));
      assertEquals(new PlainLiteralImpl("John Doe"), s.getBinding("y"));
      assertFalse(s.isBound("z"));
      assertNull(s.getBinding("z"));
      
      // Check end of results.
      assertFalse(s.next());
      TestCursor.assertCursor(s, AFTER_LAST);
    } finally {
      s.close();
    }
  }

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      s.close();
    }
  }
  
  public void testResults() throws Exception {
    Solutions s = getTestData("sparql-results");
    assertNotNull(s);
    try {
      assertTrue(s instanceof ProtocolResult);
      assertTrue(((ProtocolResult)s).getMetadata().isEmpty());
      
      String var = "a";
      assertEquals(Arrays.asList(var), s.getVariables());
      
      // Check cursor methods.
      TestCursor.assertCursor(s, BEFORE_FIRST);


      // Check results.
      assertTrue(s.next());
      TestCursor.assertCursor(s, FIRST);
      assertEquals(URI.create("http://example.org/a"), s.getURI(var));
      
      assertTrue(s.next());
      TestCursor.assertCursor(s, NONE);
      assertEquals(new BlankNodeImpl("node0"), s.getBinding(var));
      
      assertTrue(s.next());
      TestCursor.assertCursor(s, NONE);
      assertEquals(new PlainLiteralImpl("xyz"), s.getBinding(var));
      
      assertTrue(s.next());
      TestCursor.assertCursor(s, NONE);
      assertEquals(new TypedLiteralImpl("100", XsdTypes.INT), s.getBinding(var));
      assertEquals(100, s.getInt(var));
      
      assertTrue(s.next());
      TestCursor.assertCursor(s, LAST);
      assertEquals(new PlainLiteralImpl("chat", "fr"), s.getBinding(var));
      
      // Check end of results.
      assertFalse(s.next());
      TestCursor.assertCursor(s, AFTER_LAST);
    } finally {
      s.close();
    }
  }

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      s.close();
    }
  }
  
  static void metadataTest(Command cmd, String testName, String... metadata) throws Exception {
    Solutions s = getTestData(cmd, testName);
    try {
      assertNotNull(s);
      assertTrue(s instanceof ProtocolResult);
      List<String> md = ((ProtocolResult)s).getMetadata();
      assertNotNull(md);
      assertEquals(Arrays.asList(metadata), md);
      
      String varX = "x";
      String varY = "y";
      assertEquals(Arrays.asList(varX, varY), s.getVariables());
      
      TestCursor.assertCursor(s, BEFORE_FIRST);
      
      assertTrue(s.next());
      TestCursor.assertCursor(s, FIRST | LAST);
      assertEquals(URI.create("http://example.org/foo"), s.getURI(varX));
      assertEquals("bar", s.getString(varY));
      
      assertFalse(s.next());
      TestCursor.assertCursor(s, AFTER_LAST);
    } finally {
      s.close();
    }
  }

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