org.apache.jena.query.Query.addResultVar()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.addResultVar方法的一些代码示例，展示了Query.addResultVar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.addResultVar方法的具体详情如下：
包路径：org.apache.jena.query.Query
类名称：Query
方法名：addResultVar

Query.addResultVar介绍

[英]Add a projection variable to a SELECT query
[中]将投影变量添加到SELECT查询

代码示例

代码示例来源：origin: apache/jena

  1. /** Add a collection of projection variables to a SELECT query */
  2. public void addProjectVars(Collection<?> vars)
  3. {
  4.   for ( Object obj : vars )
  5.   {
  6.     if ( obj instanceof String )
  7.     {
  8.       this.addResultVar( (String) obj );
  9.       continue;
  10.     }
  11.     if ( obj instanceof Var )
  12.     {
  13.       this.addResultVar( (Var) obj );
  14.       continue;
  15.     }
  16.     throw new QueryException( "Not a variable or variable name: " + obj );
  17.   }
  18.   resultVarsSet = true ;
  19. }

代码示例来源：origin: apache/jena

  1. /**
  2.  * Add an Expression as variable to the select.
  3.  * 
  4.  * @param expr
  5.  *            The expression to add.
  6.  * @param var
  7.  *            The variable to add.
  8.  */
  9. public void addVar(Expr expr, Var var) {
  10.   if (expr == null) {
  11.     throw new IllegalArgumentException("expr may not be null");
  12.   }
  13.   if (var == null) {
  14.     throw new IllegalArgumentException("var may not be null");
  15.   }
  16.   query.setQueryResultStar(false);
  17.   query.addResultVar(var, expr);
  18.   aggHandler.add( expr, var );
  19. }

代码示例来源：origin: org.apache.jena/jena-querybuilder

  1. /**
  2.  * Add an Expression as variable to the select.
  3.  * 
  4.  * @param expr
  5.  *            The expression to add.
  6.  * @param var
  7.  *            The variable to add.
  8.  */
  9. public void addVar(Expr expr, Var var) {
  10.   if (expr == null) {
  11.     throw new IllegalArgumentException("expr may not be null");
  12.   }
  13.   if (var == null) {
  14.     throw new IllegalArgumentException("var may not be null");
  15.   }
  16.   query.setQueryResultStar(false);
  17.   query.addResultVar(var, expr);
  18.   aggHandler.add( expr, var );
  19. }

代码示例来源：origin: apache/jena

  1. /**
  2.  * Add a variable to the select. If the variable is <code>null</code> the
  3.  * variables are set to star.
  4.  * 
  5.  * @param var
  6.  *            The variable to add.
  7.  */
  8. public void addVar(Var var) {
  9.   if (var == null) {
  10.     query.setQueryResultStar(true);
  11.   } else {
  12.     query.setQueryResultStar(false);
  13.     query.addResultVar(var);
  14.   }
  15. }

代码示例来源：origin: org.apache.jena/jena-querybuilder

  1. /**
  2.  * Add a variable to the select. If the variable is <code>null</code> the
  3.  * variables are set to star.
  4.  * 
  5.  * @param var
  6.  *            The variable to add.
  7.  */
  8. public void addVar(Var var) {
  9.   if (var == null) {
  10.     query.setQueryResultStar(true);
  11.   } else {
  12.     query.setQueryResultStar(false);
  13.     query.addResultVar(var);
  14.   }
  15. }

代码示例来源：origin: apache/jena

  1. @Override
  2. public void visitSelectResultForm(Query query) {
  3.   newQuery.setQuerySelectType();
  4.   newQuery.setDistinct(query.isDistinct());
  5.   VarExprList x = query.getProject();
  6.   for (Var v : x.getVars()) {
  7.     Expr expr = x.getExpr(v);
  8.     if (expr == null)
  9.       newQuery.addResultVar(v);
  10.     else
  11.       newQuery.addResultVar(v, expr);
  12.   }
  13. }

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

  1. public static Query asQuery(Op op, Dialect dialect)
  2. {
  3.   Query query = QueryFactory.make() ;
  4.   Converter v = new Converter(query, dialect) ;
  5.   //OpWalker.walk(op, v) ;
  6.   op.visit(v) ;
  7.   List<Var> vars = v.projectVars;
  8.   query.setQueryResultStar(vars.isEmpty()); // SELECT * unless we are projecting
  9.   Iterator<Var> iter = vars.iterator();
  10.   for (; iter.hasNext();) {
  11.     Var var = iter.next();
  12.     if (v.varExpression.containsKey(var))
  13.       query.addResultVar(var, v.varExpression.get(var));
  14.     else
  15.       query.addResultVar(var);
  16.   }
  17.   ElementGroup eg = v.currentGroup ;
  18.   query.setQueryPattern(eg) ;
  19.   query.setQuerySelectType() ;
  20.   query.setResultVars() ;
  21.   return query ;
  22. }

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

  1. @Override
  2. public void visitSelectResultForm(Query query) {
  3.   newQuery.setQuerySelectType() ;
  4.   newQuery.setDistinct(query.isDistinct()) ;
  5.   VarExprList x = query.getProject() ;
  6.   for (Var v : x.getVars()) {
  7.     Expr expr = x.getExpr(v) ;
  8.     if ( expr == null )
  9.       newQuery.addResultVar(v) ;
  10.     else
  11.       newQuery.addResultVar(v, expr) ;
  12.   }
  13. }

代码示例来源：origin: apache/jena

  1. private void findAndAddNamedVars()
  2.   {
  3.     Iterator<Var> varIter = null ;
  4.     if ( hasGroupBy() )
  5.       varIter = groupVars.getVars().iterator() ;
  6.     else
  7.     {
  8.       // Binding variables -- in patterns, not in filters and not in EXISTS
  9.       LinkedHashSet<Var> queryVars = new LinkedHashSet<>() ;
  10.       PatternVars.vars(queryVars, this.getQueryPattern()) ;
  11.       if ( this.hasValues() )
  12.         queryVars.addAll(getValuesVariables()) ;
  13. //            if ( this.hasValues() )
  14. //                queryVars.addAll(getValuesVariables()) ;
  15.       varIter = queryVars.iterator() ;
  16.     }
  17.     
  18.     // All query variables, including ones from bNodes in the query.
  19.     
  20.     for ( ; varIter.hasNext() ; )
  21.     {
  22.       Object obj = varIter.next() ;
  23.       //Var var = (Var)iter.next() ;
  24.       Var var = (Var)obj ;
  25.       if ( var.isNamedVar() )
  26.         addResultVar(var) ;
  27.     }
  28.   }

代码示例来源：origin: apache/jena

  1. public void addDescribeNode(Node node)
  2. {
  3.   if ( node.isVariable() ) { addResultVar(node) ; return ; }
  4.   if ( node.isURI() || node.isBlank() )
  5.   {
  6.     if ( !resultNodes.contains(node) )
  7.       resultNodes.add(node);
  8.     return ;
  9.   }
  10.   if ( node.isLiteral() )
  11.     throw new QueryException("Result node is a literal: "+FmtUtils.stringForNode(node)) ;
  12.   throw new QueryException("Result node not recognized: "+node) ;
  13. }

代码示例来源：origin: org.trellisldp/trellis-triplestore

  1. /**
  2.  * This code is equivalent to the SPARQL query below.
  3.  *
  4.  * <p><pre><code>
  5.  * SELECT ?subject ?predicate ?object
  6.  * WHERE { GRAPH fromGraphName { ?subject ?predicate ?object } }
  7.  * </code></pre>
  8.  */
  9. private Stream<Quad> fetchAllFromGraph(final String fromGraphName, final IRI toGraphName) {
  10.   final Query q = new Query();
  11.   q.setQuerySelectType();
  12.   q.addResultVar(SUBJECT);
  13.   q.addResultVar(PREDICATE);
  14.   q.addResultVar(OBJECT);
  15.   final ElementPathBlock epb = new ElementPathBlock();
  16.   epb.addTriple(create(SUBJECT, PREDICATE, OBJECT));
  17.   final ElementGroup elg = new ElementGroup();
  18.   elg.addElement(new ElementNamedGraph(createURI(fromGraphName), epb));
  19.   q.setQueryPattern(elg);
  20.   final Stream.Builder<Quad> builder = builder();
  21.   rdfConnection.querySelect(q, qs -> builder.accept(rdf.createQuad(toGraphName,
  22.           getSubject(qs), getPredicate(qs), getObject(qs))));
  23.   return builder.build();
  24. }

代码示例来源：origin: trellis-ldp/trellis

  1. /**
  2.  * This code is equivalent to the SPARQL query below.
  3.  *
  4.  * <p><pre><code>
  5.  * SELECT ?subject ?predicate ?object
  6.  * WHERE { GRAPH fromGraphName { ?subject ?predicate ?object } }
  7.  * </code></pre>
  8.  */
  9. private Stream<Quad> fetchAllFromGraph(final String fromGraphName, final IRI toGraphName) {
  10.   final Query q = new Query();
  11.   q.setQuerySelectType();
  12.   q.addResultVar(SUBJECT);
  13.   q.addResultVar(PREDICATE);
  14.   q.addResultVar(OBJECT);
  15.   final ElementPathBlock epb = new ElementPathBlock();
  16.   epb.addTriple(create(SUBJECT, PREDICATE, OBJECT));
  17.   final ElementGroup elg = new ElementGroup();
  18.   elg.addElement(new ElementNamedGraph(createURI(fromGraphName), epb));
  19.   q.setQueryPattern(elg);
  20.   final Stream.Builder<Quad> builder = builder();
  21.   rdfConnection.querySelect(q, qs -> builder.accept(rdf.createQuad(toGraphName,
  22.           getSubject(qs), getPredicate(qs), getObject(qs))));
  23.   return builder.build();
  24. }

代码示例来源：origin: apache/jena

  1. case VAR2:
  2.  o = Var();
  3.       getQuery().addResultVar((Var)o) ; getQuery().addJsonMapping(s, o) ;
  4.  break;
  5. case STRING_LITERAL1:
  6. case STRING_LITERAL_LONG2:
  7.  o = RDFLiteral();
  8.           getQuery().addResultVar(s, NodeValue.makeNode(o)) ; getQuery().addJsonMapping(s, o) ;
  9.  break;
  10. case INTEGER:
  11. case DOUBLE_NEGATIVE:
  12.  o = NumericLiteral();
  13.             getQuery().addResultVar(s, NodeValue.makeNode(o)) ; getQuery().addJsonMapping(s, o) ;
  14.  break;
  15. case TRUE:
  16. case FALSE:
  17.  o = BooleanLiteral();
  18.             getQuery().addResultVar(s, NodeValue.makeNode(o)) ; getQuery().addJsonMapping(s, o) ;
  19.  break;
  20. default:

代码示例来源：origin: org.trellisldp/trellis-triplestore

  1. /**
  2.  * This code is equivalent to the SPARQL query below.
  3.  *
  4.  * <p><pre><code>
  5.  * SELECT ?object
  6.  * WHERE {
  7.  *   GRAPH trellis:PreferServerManaged { ?object dc:isPartOf IDENTIFIER }
  8.  * }
  9.  * </code></pre>
  10.  */
  11. private Stream<Quad> fetchContainmentQuads() {
  12.   if (getInteractionModel().getIRIString().endsWith("Container")) {
  13.     final Query q = new Query();
  14.     q.setQuerySelectType();
  15.     q.addResultVar(OBJECT);
  16.     final ElementPathBlock epb = new ElementPathBlock();
  17.     epb.addTriple(create(OBJECT, rdf.asJenaNode(DC.isPartOf), rdf.asJenaNode(identifier)));
  18.     final ElementNamedGraph ng = new ElementNamedGraph(rdf.asJenaNode(Trellis.PreferServerManaged), epb);
  19.     final ElementGroup elg = new ElementGroup();
  20.     elg.addElement(ng);
  21.     q.setQueryPattern(elg);
  22.     final Stream.Builder<Quad> builder = builder();
  23.     rdfConnection.querySelect(q, qs -> builder.accept(rdf.createQuad(LDP.PreferContainment,
  24.             identifier, LDP.contains, getObject(qs))));
  25.     return builder.build();
  26.   }
  27.   return Stream.empty();
  28. }

代码示例来源：origin: trellis-ldp/trellis

  1. /**
  2.  * This code is equivalent to the SPARQL query below.
  3.  *
  4.  * <p><pre><code>
  5.  * SELECT ?object
  6.  * WHERE {
  7.  *   GRAPH trellis:PreferServerManaged { ?object dc:isPartOf IDENTIFIER }
  8.  * }
  9.  * </code></pre>
  10.  */
  11. private Stream<Quad> fetchContainmentQuads() {
  12.   if (getInteractionModel().getIRIString().endsWith("Container")) {
  13.     final Query q = new Query();
  14.     q.setQuerySelectType();
  15.     q.addResultVar(OBJECT);
  16.     final ElementPathBlock epb = new ElementPathBlock();
  17.     epb.addTriple(create(OBJECT, rdf.asJenaNode(DC.isPartOf), rdf.asJenaNode(identifier)));
  18.     final ElementNamedGraph ng = new ElementNamedGraph(rdf.asJenaNode(Trellis.PreferServerManaged), epb);
  19.     final ElementGroup elg = new ElementGroup();
  20.     elg.addElement(ng);
  21.     q.setQueryPattern(elg);
  22.     final Stream.Builder<Quad> builder = builder();
  23.     rdfConnection.querySelect(q, qs -> builder.accept(rdf.createQuad(LDP.PreferContainment,
  24.             identifier, LDP.contains, getObject(qs))));
  25.     return builder.build();
  26.   }
  27.   return Stream.empty();
  28. }

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

  1. q.setResultVars();
  2. for(String v : query.getResultVars()) {
  3.   q.addResultVar(v);

代码示例来源：origin: org.trellisldp/trellis-triplestore

  1. final Query q = new Query();
  2. q.setQuerySelectType();
  3. q.addResultVar(SUBJECT);
  4. q.addResultVar(PREDICATE);
  5. q.addResultVar(OBJECT);
  6. final Var s = Var.alloc("s");

代码示例来源：origin: trellis-ldp/trellis

  1. final Query q = new Query();
  2. q.setQuerySelectType();
  3. q.addResultVar(PREDICATE);
  4. q.addResultVar(OBJECT);

代码示例来源：origin: org.trellisldp/trellis-triplestore

  1. final Query q = new Query();
  2. q.setQuerySelectType();
  3. q.addResultVar(PREDICATE);
  4. q.addResultVar(OBJECT);

代码示例来源：origin: SmartDataAnalytics/DL-Learner

  1. @Override
  2. public Query toQuery(){
  3.   Query query = QueryFactory.make();
  4.   query.setQuerySelectType();
  5.   query.addResultVar(NodeFactory.createVariable("x0"));
  6.   query.setDistinct(true);
  7.   query.setPrefix("rdf", "http://www.w3.org/1999/02/22-rdf-syntax-ns#");
  8.   query.setPrefix("rdfs", "http://www.w3.org/2000/01/rdf-schema#");
  9.   query.setPrefix("yago", "http://dbpedia.org/class/yago/");
  10.   query.setPrefix("cyc", "http://sw.opencyc.org/2008/06/10/concept/");
  11.   query.setPrefix("owl", "http://www.w3.org/2002/07/owl#");
  12.   query.setPrefix("dbp", "http://dbpedia.org/property/");
  13.   query.setPrefix("dbo", "http://dbpedia.org/ontology/");
  14.   query.setPrefix("dbr", "http://dbpedia.org/resource/");
  15.   query.setPrefix("dc", "http://purl.org/dc/terms/");
  16.   ElementGroup whereClause = new ElementGroup();
  17.   ElementTriplesBlock triples = new ElementTriplesBlock();
  18.   for(Triple t : buildTriples(this)){
  19.     triples.addTriple(t);
  20.   }
  21.   whereClause.addElement(triples);
  22.   
  23.   query.setQueryPattern(whereClause);
  24.   return query;
  25. }

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