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

/** Add a collection of projection variables to a SELECT query */
public void addProjectVars(Collection<?> vars)
{
  for ( Object obj : vars )
  {
    if ( obj instanceof String )
    {
      this.addResultVar( (String) obj );
      continue;
    }
    if ( obj instanceof Var )
    {
      this.addResultVar( (Var) obj );
      continue;
    }
    throw new QueryException( "Not a variable or variable name: " + obj );
  }
  resultVarsSet = true ;
}

代码示例来源：origin: apache/jena

/**
 * Add an Expression as variable to the select.
 * 
 * @param expr
 *            The expression to add.
 * @param var
 *            The variable to add.
 */
public void addVar(Expr expr, Var var) {
  if (expr == null) {
    throw new IllegalArgumentException("expr may not be null");
  }
  if (var == null) {
    throw new IllegalArgumentException("var may not be null");
  }
  query.setQueryResultStar(false);
  query.addResultVar(var, expr);
  aggHandler.add( expr, var );
}

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

/**
 * Add an Expression as variable to the select.
 * 
 * @param expr
 *            The expression to add.
 * @param var
 *            The variable to add.
 */
public void addVar(Expr expr, Var var) {
  if (expr == null) {
    throw new IllegalArgumentException("expr may not be null");
  }
  if (var == null) {
    throw new IllegalArgumentException("var may not be null");
  }
  query.setQueryResultStar(false);
  query.addResultVar(var, expr);
  aggHandler.add( expr, var );
}

代码示例来源：origin: apache/jena

/**
 * Add a variable to the select. If the variable is <code>null</code> the
 * variables are set to star.
 * 
 * @param var
 *            The variable to add.
 */
public void addVar(Var var) {
  if (var == null) {
    query.setQueryResultStar(true);
  } else {
    query.setQueryResultStar(false);
    query.addResultVar(var);
  }
}

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

/**
 * Add a variable to the select. If the variable is <code>null</code> the
 * variables are set to star.
 * 
 * @param var
 *            The variable to add.
 */
public void addVar(Var var) {
  if (var == null) {
    query.setQueryResultStar(true);
  } else {
    query.setQueryResultStar(false);
    query.addResultVar(var);
  }
}

代码示例来源：origin: apache/jena

@Override
public void visitSelectResultForm(Query query) {
  newQuery.setQuerySelectType();
  newQuery.setDistinct(query.isDistinct());
  VarExprList x = query.getProject();
  for (Var v : x.getVars()) {
    Expr expr = x.getExpr(v);
    if (expr == null)
      newQuery.addResultVar(v);
    else
      newQuery.addResultVar(v, expr);
  }
}

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

public static Query asQuery(Op op, Dialect dialect)
{
  Query query = QueryFactory.make() ;
  Converter v = new Converter(query, dialect) ;
  //OpWalker.walk(op, v) ;
  op.visit(v) ;
  List<Var> vars = v.projectVars;
  query.setQueryResultStar(vars.isEmpty()); // SELECT * unless we are projecting
  Iterator<Var> iter = vars.iterator();
  for (; iter.hasNext();) {
    Var var = iter.next();
    if (v.varExpression.containsKey(var))
      query.addResultVar(var, v.varExpression.get(var));
    else
      query.addResultVar(var);
  }
  ElementGroup eg = v.currentGroup ;
  query.setQueryPattern(eg) ;
  query.setQuerySelectType() ;
  query.setResultVars() ;
  return query ;
}

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

@Override
public void visitSelectResultForm(Query query) {
  newQuery.setQuerySelectType() ;
  newQuery.setDistinct(query.isDistinct()) ;
  VarExprList x = query.getProject() ;
  for (Var v : x.getVars()) {
    Expr expr = x.getExpr(v) ;
    if ( expr == null )
      newQuery.addResultVar(v) ;
    else
      newQuery.addResultVar(v, expr) ;
  }
}

代码示例来源：origin: apache/jena

private void findAndAddNamedVars()
  {
    Iterator<Var> varIter = null ;
    if ( hasGroupBy() )
      varIter = groupVars.getVars().iterator() ;
    else
    {
      // Binding variables -- in patterns, not in filters and not in EXISTS
      LinkedHashSet<Var> queryVars = new LinkedHashSet<>() ;
      PatternVars.vars(queryVars, this.getQueryPattern()) ;
      if ( this.hasValues() )
        queryVars.addAll(getValuesVariables()) ;
//            if ( this.hasValues() )
//                queryVars.addAll(getValuesVariables()) ;
      varIter = queryVars.iterator() ;
    }
    
    // All query variables, including ones from bNodes in the query.
    
    for ( ; varIter.hasNext() ; )
    {
      Object obj = varIter.next() ;
      //Var var = (Var)iter.next() ;
      Var var = (Var)obj ;
      if ( var.isNamedVar() )
        addResultVar(var) ;
    }
  }

代码示例来源：origin: apache/jena

public void addDescribeNode(Node node)
{
  if ( node.isVariable() ) { addResultVar(node) ; return ; }
  if ( node.isURI() || node.isBlank() )
  {
    if ( !resultNodes.contains(node) )
      resultNodes.add(node);
    return ;
  }
  if ( node.isLiteral() )
    throw new QueryException("Result node is a literal: "+FmtUtils.stringForNode(node)) ;
  throw new QueryException("Result node not recognized: "+node) ;
}

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

/**
 * This code is equivalent to the SPARQL query below.
 *
 * <p><pre><code>
 * SELECT ?subject ?predicate ?object
 * WHERE { GRAPH fromGraphName { ?subject ?predicate ?object } }
 * </code></pre>
 */
private Stream<Quad> fetchAllFromGraph(final String fromGraphName, final IRI toGraphName) {
  final Query q = new Query();
  q.setQuerySelectType();
  q.addResultVar(SUBJECT);
  q.addResultVar(PREDICATE);
  q.addResultVar(OBJECT);
  final ElementPathBlock epb = new ElementPathBlock();
  epb.addTriple(create(SUBJECT, PREDICATE, OBJECT));
  final ElementGroup elg = new ElementGroup();
  elg.addElement(new ElementNamedGraph(createURI(fromGraphName), epb));
  q.setQueryPattern(elg);
  final Stream.Builder<Quad> builder = builder();
  rdfConnection.querySelect(q, qs -> builder.accept(rdf.createQuad(toGraphName,
          getSubject(qs), getPredicate(qs), getObject(qs))));
  return builder.build();
}

代码示例来源：origin: trellis-ldp/trellis

/**
 * This code is equivalent to the SPARQL query below.
 *
 * <p><pre><code>
 * SELECT ?subject ?predicate ?object
 * WHERE { GRAPH fromGraphName { ?subject ?predicate ?object } }
 * </code></pre>
 */
private Stream<Quad> fetchAllFromGraph(final String fromGraphName, final IRI toGraphName) {
  final Query q = new Query();
  q.setQuerySelectType();
  q.addResultVar(SUBJECT);
  q.addResultVar(PREDICATE);
  q.addResultVar(OBJECT);
  final ElementPathBlock epb = new ElementPathBlock();
  epb.addTriple(create(SUBJECT, PREDICATE, OBJECT));
  final ElementGroup elg = new ElementGroup();
  elg.addElement(new ElementNamedGraph(createURI(fromGraphName), epb));
  q.setQueryPattern(elg);
  final Stream.Builder<Quad> builder = builder();
  rdfConnection.querySelect(q, qs -> builder.accept(rdf.createQuad(toGraphName,
          getSubject(qs), getPredicate(qs), getObject(qs))));
  return builder.build();
}

代码示例来源：origin: apache/jena

case VAR2:
 o = Var();
      getQuery().addResultVar((Var)o) ; getQuery().addJsonMapping(s, o) ;
 break;
case STRING_LITERAL1:
case STRING_LITERAL_LONG2:
 o = RDFLiteral();
          getQuery().addResultVar(s, NodeValue.makeNode(o)) ; getQuery().addJsonMapping(s, o) ;
 break;
case INTEGER:
case DOUBLE_NEGATIVE:
 o = NumericLiteral();
            getQuery().addResultVar(s, NodeValue.makeNode(o)) ; getQuery().addJsonMapping(s, o) ;
 break;
case TRUE:
case FALSE:
 o = BooleanLiteral();
            getQuery().addResultVar(s, NodeValue.makeNode(o)) ; getQuery().addJsonMapping(s, o) ;
 break;
default:

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

/**
 * This code is equivalent to the SPARQL query below.
 *
 * <p><pre><code>
 * SELECT ?object
 * WHERE {
 *   GRAPH trellis:PreferServerManaged { ?object dc:isPartOf IDENTIFIER }
 * }
 * </code></pre>
 */
private Stream<Quad> fetchContainmentQuads() {
  if (getInteractionModel().getIRIString().endsWith("Container")) {
    final Query q = new Query();
    q.setQuerySelectType();
    q.addResultVar(OBJECT);
    final ElementPathBlock epb = new ElementPathBlock();
    epb.addTriple(create(OBJECT, rdf.asJenaNode(DC.isPartOf), rdf.asJenaNode(identifier)));
    final ElementNamedGraph ng = new ElementNamedGraph(rdf.asJenaNode(Trellis.PreferServerManaged), epb);
    final ElementGroup elg = new ElementGroup();
    elg.addElement(ng);
    q.setQueryPattern(elg);
    final Stream.Builder<Quad> builder = builder();
    rdfConnection.querySelect(q, qs -> builder.accept(rdf.createQuad(LDP.PreferContainment,
            identifier, LDP.contains, getObject(qs))));
    return builder.build();
  }
  return Stream.empty();
}

代码示例来源：origin: trellis-ldp/trellis

/**
 * This code is equivalent to the SPARQL query below.
 *
 * <p><pre><code>
 * SELECT ?object
 * WHERE {
 *   GRAPH trellis:PreferServerManaged { ?object dc:isPartOf IDENTIFIER }
 * }
 * </code></pre>
 */
private Stream<Quad> fetchContainmentQuads() {
  if (getInteractionModel().getIRIString().endsWith("Container")) {
    final Query q = new Query();
    q.setQuerySelectType();
    q.addResultVar(OBJECT);
    final ElementPathBlock epb = new ElementPathBlock();
    epb.addTriple(create(OBJECT, rdf.asJenaNode(DC.isPartOf), rdf.asJenaNode(identifier)));
    final ElementNamedGraph ng = new ElementNamedGraph(rdf.asJenaNode(Trellis.PreferServerManaged), epb);
    final ElementGroup elg = new ElementGroup();
    elg.addElement(ng);
    q.setQueryPattern(elg);
    final Stream.Builder<Quad> builder = builder();
    rdfConnection.querySelect(q, qs -> builder.accept(rdf.createQuad(LDP.PreferContainment,
            identifier, LDP.contains, getObject(qs))));
    return builder.build();
  }
  return Stream.empty();
}

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

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

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

final Query q = new Query();
q.setQuerySelectType();
q.addResultVar(SUBJECT);
q.addResultVar(PREDICATE);
q.addResultVar(OBJECT);
final Var s = Var.alloc("s");

代码示例来源：origin: trellis-ldp/trellis

final Query q = new Query();
q.setQuerySelectType();
q.addResultVar(PREDICATE);
q.addResultVar(OBJECT);

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

final Query q = new Query();
q.setQuerySelectType();
q.addResultVar(PREDICATE);
q.addResultVar(OBJECT);

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

@Override
public Query toQuery(){
  Query query = QueryFactory.make();
  query.setQuerySelectType();
  query.addResultVar(NodeFactory.createVariable("x0"));
  query.setDistinct(true);
  query.setPrefix("rdf", "http://www.w3.org/1999/02/22-rdf-syntax-ns#");
  query.setPrefix("rdfs", "http://www.w3.org/2000/01/rdf-schema#");
  query.setPrefix("yago", "http://dbpedia.org/class/yago/");
  query.setPrefix("cyc", "http://sw.opencyc.org/2008/06/10/concept/");
  query.setPrefix("owl", "http://www.w3.org/2002/07/owl#");
  query.setPrefix("dbp", "http://dbpedia.org/property/");
  query.setPrefix("dbo", "http://dbpedia.org/ontology/");
  query.setPrefix("dbr", "http://dbpedia.org/resource/");
  query.setPrefix("dc", "http://purl.org/dc/terms/");
  ElementGroup whereClause = new ElementGroup();
  ElementTriplesBlock triples = new ElementTriplesBlock();
  for(Triple t : buildTriples(this)){
    triples.addTriple(t);
  }
  whereClause.addElement(triples);
  
  query.setQueryPattern(whereClause);
  return query;
}

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