org.apache.jena.query.Query.getResultVars()方法的使用及代码示例

x33g5p2x  于2022-01-28 转载在 其他  
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本文整理了Java中org.apache.jena.query.Query.getResultVars方法的一些代码示例，展示了Query.getResultVars的具体用法。这些代码示例主要来源于Github/Stackoverflow/Maven等平台，是从一些精选项目中提取出来的代码，具有较强的参考意义，能在一定程度帮忙到你。Query.getResultVars方法的具体详情如下：
包路径：org.apache.jena.query.Query
类名称：Query
方法名：getResultVars

Query.getResultVars介绍

[英]Return a list of the variables requested (SELECT)
[中]返回所请求变量的列表（选择）

代码示例

代码示例来源：origin: apache/tinkerpop

  1. final List<String> vars = query.getResultVars();
  2. if (!query.isQueryResultStar() && !query.hasGroupBy()) {
  3.   final String[] all = new String[vars.size()];

代码示例来源：origin: apache/jena

  1. @Override
  2. public void visitDescribeResultForm(Query query)
  3. {
  4.   x ^= query.getResultVars().hashCode() ;
  5.   x ^= query.getResultURIs().hashCode() ;
  6. }

代码示例来源：origin: org.aksw.rdfunit/rdfunit-model

  1. private Optional<ResultAnnotation> getFocusNodeAnnotation() {
  2.   if (query.getResultVars().contains("focusNode")) {
  3.     return Optional.of(
  4.         createVariableAnnotation(SHACL.focusNode, "focusNode"));
  5.   } else {
  6.     return Optional.of(
  7.         createVariableAnnotation(SHACL.focusNode, "this"));
  8.   }
  9. }

代码示例来源：origin: AKSW/RDFUnit

  1. private Optional<ResultAnnotation> getFocusNodeAnnotation() {
  2.   if (query.getResultVars().contains("focusNode")) {
  3.     return Optional.of(
  4.         createVariableAnnotation(SHACL.focusNode, "focusNode"));
  5.   } else {
  6.     return Optional.of(
  7.         createVariableAnnotation(SHACL.focusNode, "this"));
  8.   }
  9. }

代码示例来源：origin: org.aksw.rdfunit/rdfunit-model

  1. private Optional<ResultAnnotation> getMessageAnnotation() {
  2.   if (query.getResultVars().contains("message")) {
  3.     return Optional.of(
  4.         createVariableAnnotation(SHACL.resultMessage, "message"));
  5.   } else {
  6.     return ImmutableList.of(shape.getMessage(),validator.getDefaultMessage()).stream()
  7.         .filter(Optional::isPresent)
  8.         .map(Optional::get)
  9.         .findFirst()
  10.         .map(message -> createValueAnnotation(SHACL.resultMessage, message));
  11.   }
  12. }

代码示例来源：origin: AKSW/RDFUnit

  1. private Optional<ResultAnnotation> getMessageAnnotation() {
  2.   if (query.getResultVars().contains("message")) {
  3.     return Optional.of(
  4.         createVariableAnnotation(SHACL.resultMessage, "message"));
  5.   } else {
  6.     return ImmutableList.of(shape.getMessage(),validator.getDefaultMessage()).stream()
  7.         .filter(Optional::isPresent)
  8.         .map(Optional::get)
  9.         .findFirst()
  10.         .map(message -> createValueAnnotation(SHACL.resultMessage, message));
  11.   }
  12. }

代码示例来源：origin: apache/jena

  1. /**
  2.  * Execute a query, expecting the result to be one row, one column. Return
  3.  * that one RDFNode
  4.  */
  5. public static RDFNode getExactlyOne(String qs, Dataset ds) {
  6.   Query q = QueryFactory.create(qs) ;
  7.   if ( q.getResultVars().size() != 1 )
  8.     throw new ARQException("getExactlyOne: Must have exactly one result columns") ;
  9.   String varname = q.getResultVars().get(0) ;
  10.   try ( QueryExecution qExec = QueryExecutionFactory.create(q, ds) ) {
  11.     return getExactlyOne(qExec, varname) ;
  12.   }
  13. }

代码示例来源：origin: SmartDataAnalytics/jena-sparql-api

  1. @Bean
  2.   @StepScope
  3.   @Autowired
  4.   public LineAggregator<Binding> lineAggregator(Query query) {
  5.     List<String> varNames = query.getResultVars();
  6.     LineAggregator<Binding> result = new LineAggregatorBindingToXml(varNames);
  8.     return result;
  9. //        return new LineAggregator<Binding>() {
  10. //            @Override
  11. //            public String aggregate(Binding item) {
  12. //                return item.toString();
  13. //            }
  14. //        };
  15.   }

代码示例来源：origin: SmartDataAnalytics/jena-sparql-api

  1. public static Node extractDescribeNode(Query query) {
  2.   if (!query.isDescribeType()) {
  3.     throw new RuntimeException("DESCRIBE query expected. Got: ["
  4.         + query.toString() + "]");
  5.   }
  6.   // TODO Right now we only support describe with a single constant.
  7.   //Element queryPattern = query.getQueryPattern();
  8.   if(query.getQueryPattern() != null || !query.getResultVars().isEmpty() || query.getResultURIs().size() > 1) {
  9.     throw new RuntimeException("Sorry, DESCRIBE is only implemented for a single resource argument");
  10.   }
  11.   Node result = query.getResultURIs().get(0);
  12.   return result;
  13. }

代码示例来源：origin: apache/jena

  1. @Override
  2. public void visitDescribeResultForm(Query query1)
  3. {
  4.   check("Not both DESCRIBE queries", query2.isDescribeType()) ;
  5.   check("Result variables", 
  6.      query1.getResultVars(), query2.getResultVars() ) ;
  7.   check("Result URIs", 
  8.      query1.getResultURIs(), query2.getResultURIs() ) ;
  9.   
  10. }

代码示例来源：origin: apache/jena

  1. private ResultSet asResultSet(QueryIterator qIter) {
  2.   Model model = null ;
  3.   if ( dataset != null )
  4.     model = dataset.getDefaultModel() ;
  5.   else
  6.     model = ModelFactory.createDefaultModel() ;
  7.   
  8.   ResultSetStream rStream = new ResultSetStream(query.getResultVars(), model, qIter) ;
  9.   return rStream ;
  10. }

代码示例来源：origin: org.aksw.rdfunit/rdfunit-model

  1. private Optional<ResultAnnotation> getPathAnnotation() {
  2.   if (query.getResultVars().contains("path")) {
  3.     List<Var> vars = query.getProjectVars();
  4.     VarExprList vel = query.getProject();
  5.     return Optional.of(
  6.       createVariableAnnotation(SHACL.resultPath, "path"));
  7.   } else {
  8.     if (shape.getPath().isPresent()) {
  9.       return Optional.of(
  10.         createValueAnnotation(SHACL.resultPath, shape.getPath().get().getPathAsRdf()));
  11.     }
  12.   }
  13.   return Optional.empty();
  14. }

代码示例来源：origin: AKSW/RDFUnit

  1. private Optional<ResultAnnotation> getPathAnnotation() {
  2.   if (query.getResultVars().contains("path")) {
  3.     List<Var> vars = query.getProjectVars();
  4.     VarExprList vel = query.getProject();
  5.     return Optional.of(
  6.       createVariableAnnotation(SHACL.resultPath, "path"));
  7.   } else {
  8.     if (shape.getPath().isPresent()) {
  9.       return Optional.of(
  10.         createValueAnnotation(SHACL.resultPath, shape.getPath().get().getPathAsRdf()));
  11.     }
  12.   }
  13.   return Optional.empty();
  14. }

代码示例来源：origin: apache/jena

  1. @Override
  2. public void visitDescribeResultForm(Query query)
  3. {
  4.   out.print("DESCRIBE ") ;
  5.   
  6.   if ( query.isQueryResultStar() )
  7.     out.print("*") ;
  8.   else
  9.   {
  10.     appendVarList(query, out, query.getResultVars()) ;
  11.     if ( query.getResultVars().size() > 0 &&
  12.        query.getResultURIs().size() > 0 )
  13.       out.print(" ") ;
  14.     appendURIList(query, out, query.getResultURIs()) ;
  15.   }
  16.   out.newline() ;
  17. }

代码示例来源：origin: apache/jena

  1. @Test
  2. public void testDoubleCount() {
  3.   Query[] result = test_roundTripQuery("select (count(?s) as ?sc) (count(?p) as ?pc) { ?s ?p ?o }") ;
  4.   assertEquals(2, result[1].getResultVars().size());
  5.   assertTrue(result[1].getResultVars().contains("sc"));
  6.   assertTrue(result[1].getResultVars().contains("pc"));
  7. }

代码示例来源：origin: apache/jena

  1. @Test
  2. public void testProject2() {
  3.   Query[] result = test_roundTripQuery("SELECT (?x + 1 AS ?c) ?d {}");
  4.   assertEquals(2, result[1].getResultVars().size());
  5.   assertTrue(result[1].getResultVars().contains("c"));
  6.   assertTrue(result[1].getResultVars().contains("d"));
  7. }

代码示例来源：origin: apache/jena

  1. /** Find the variables needed out of this query.
  2.  * If we don't do sorting in-DB, then we need the ORDER BY variables as well. 
  3.  * @param query
  4.  */
  5. public static List<Var> queryOutVars(Query query)
  6. {
  7.   // If part query, need all variables. 
  8.   
  9.   // Project variables
  10.   List<Var> vars = toList(map(query.getResultVars().iterator(), Var::alloc)) ;
  11.   
  12.   // Add the ORDER BY variables
  13.   List<SortCondition> orderConditions = query.getOrderBy() ;
  14.   if ( orderConditions != null )
  15.   {
  16.     for ( SortCondition sc : orderConditions )
  17.     {
  18.       Set<Var> x = sc.getExpression().getVarsMentioned() ;
  19.       for ( Var v :  x )
  20.       {
  21.         if ( ! vars.contains(v) )
  22.           vars.add(v) ;
  23.       }
  24.     }
  25.   }
  26.   return vars ;
  27. }

代码示例来源：origin: SmartDataAnalytics/jena-sparql-api

  1. /**
  2.  *
  3.  *
  4.  * @param pattern
  5.  *            a pattern of a where-clause
  6.  * @param resultVar
  7.  *            an optional result variable (used for describe queries)
  8.  * @return
  9.  */
  10. public static Query elementToQuery(Element pattern, String resultVar) {
  11.   if (pattern == null)
  12.     return null;
  13.   Query query = new Query();
  14.   query.setQueryPattern(pattern);
  15.   query.setQuerySelectType();
  16.   if (resultVar == null) {
  17.     query.setQueryResultStar(true);
  18.   }
  19.   query.setResultVars();
  20.   if (resultVar != null) {
  21.     query.getResultVars().add(resultVar);
  22.   }
  23.   return query;
  24. }

代码示例来源：origin: apache/jena

  1. @Override
  2. public Iterator<JsonObject> execJsonItems() 
  3. {
  4.   checkNotClosed() ;
  5.   if ( ! query.isJsonType() )
  6.     throw new QueryExecException("Attempt to get a JSON result from a " + labelForQuery(query)+" query") ;
  7.   startQueryIterator() ;
  8.   return new JsonIterator(queryIterator, query.getResultVars()) ;
  9. }

代码示例来源：origin: apache/jena

  1. @Override
  2. public JsonArray execJson()
  3. {
  4.   checkNotClosed() ;
  5.   if ( ! query.isJsonType() )
  6.     throw new QueryExecException("Attempt to get a JSON result from a " + labelForQuery(query)+" query") ;
  7.   startQueryIterator() ;
  8.   JsonArray jsonArray = new JsonArray() ;
  9.   List<String> resultVars = query.getResultVars() ;
  10.   while (queryIterator.hasNext())
  11.   {
  12.     Binding binding = queryIterator.next() ;
  13.     JsonObject jsonObject = new JsonObject() ; 
  14.     for (String resultVar : resultVars) {
  15.       Node n = binding.get(Var.alloc(resultVar)) ;
  16.       JsonValue value = RDFTerm2Json.fromNode(n) ;
  17.       jsonObject.put(resultVar, value) ;
  18.     }
  19.     jsonArray.add(jsonObject) ;
  20.   }
  21.   return jsonArray ;
  22. }

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