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package?arq.examples;

import?org.apache.jena.query.Query?;
import?org.apache.jena.query.QueryFactory?;
import?org.apache.jena.sparql.algebra.Algebra?;
import?org.apache.jena.sparql.algebra.Op?;
import?org.apache.jena.sparql.engine.QueryIterator?;
import?org.apache.jena.sparql.engine.binding.Binding?;

/**?Simple?example?to?show?parsing?a?query?and?producing?the
?*??SPARQL?algebra?expression?for?the?query.?*/
public?class?AlgebraEx
{
????public?static?void?main（String?[]args）
????{
????????String?s?=?“SELECT?DISTINCT??s?{??s??p??o?}“;
????????
????????//?Parse
????????Query?query?=?QueryFactory.create（s）?;
????????System.out.println（query）?;
????????
????????//?Generate?algebra
????????Op?op?=?Algebra.compile（query）?;
????????op?=?Algebra.optimize（op）?;
????????System.out.println（op）?;
????????
????????//?Execute?it.
????????QueryIterator?qIter?=?Algebra.exec（op?ExQuerySelect1.createModel（））?;
????????
????????//?Results
????????for?（?;?qIter.hasNext（）?;?）
????????{
????????????Binding?b?=?qIter.nextBinding（）?;
????????????System.out.println（b）?;
????????}
????????qIter.close（）?;
????}
}