本文整理汇总了Java中com.hp.hpl.jena.sparql.engine.optimizer.reorder.ReorderFixed.reorder方法的典型用法代码示例。如果您正苦于以下问题：Java ReorderFixed.reorder方法的具体用法？Java ReorderFixed.reorder怎么用？Java ReorderFixed.reorder使用的例子？那么, 这里精选的方法代码示例或许可以为您提供帮助。您也可以进一步了解该方法所在类com.hp.hpl.jena.sparql.engine.optimizer.reorder.ReorderFixed的用法示例。
在下文中一共展示了ReorderFixed.reorder方法的3个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于系统推荐出更棒的Java代码示例。
示例1: transform
import com.hp.hpl.jena.sparql.engine.optimizer.reorder.ReorderFixed; //导入方法依赖的package包/类
@Override
public Op transform(OpBGP opBGP) {
// if there are no more than 2 Triples -> reordering is useless
if (opBGP.getPattern().size() <= 2) {
return opBGP;
}
// Reorder by Selectivity
ReorderFixed optimizer1 = (ReorderFixed) ReorderLib.fixed();
BasicPattern optimizedPattern1 = optimizer1.reorder(opBGP.getPattern());
// Reorder to avoid cross products and reduce the number of joins, if possible
ReorderNoCross optimizer2 = new ReorderNoCross();
BasicPattern optimizedPattern2 = optimizer2.reorder(optimizedPattern1);
OpBGP optimizedBGP = new OpBGP(optimizedPattern2);
return optimizedBGP;
/*
Heuristic variableCountingUnbound = new VariableCountingUnbound();
BasicPatternGraph graph = new BasicPatternGraph(opBGP.getPattern(), variableCountingUnbound);
BasicPattern optimizedPattern2 = graph.optimize();
OpBGP optimizedBGP2 = new OpBGP(optimizedPattern2);
return optimizedBGP2;
*/
}
示例2: transform
import com.hp.hpl.jena.sparql.engine.optimizer.reorder.ReorderFixed; //导入方法依赖的package包/类
@Override
public Op transform(OpBGP opBGP) {
// if there are no more than 2 Triples -> reordering is useless
if (opBGP.getPattern().size() <= 2) {
return opBGP;
}
// Reorder by Selectivity
ReorderFixed optimizer1 = (ReorderFixed) ReorderLib.fixed();
BasicPattern optimizedPattern1 = optimizer1.reorder(opBGP.getPattern());
// Reorder to avoid cross products and reduce the number of joins, if possible -> Multijoins
ReorderNoCross optimizer2 = new ReorderNoCross();
BasicPattern optimizedPattern2 = optimizer2.reorder(optimizedPattern1);
OpBGP optimizedBGP = new OpBGP(optimizedPattern2);
return optimizedBGP;
/*
Heuristic variableCountingUnbound = new VariableCountingUnbound();
BasicPatternGraph graph = new BasicPatternGraph(opBGP.getPattern(), variableCountingUnbound);
BasicPattern optimizedPattern2 = graph.optimize();
OpBGP optimizedBGP2 = new OpBGP(optimizedPattern2);
return optimizedBGP2;
*/
}
示例3: transform
import com.hp.hpl.jena.sparql.engine.optimizer.reorder.ReorderFixed; //导入方法依赖的package包/类
@Override
public Op transform(OpBGP opBGP) {
// if there are no more than 2 Triples -> reordering is useless
if (opBGP.getPattern().size() <= 2) {
return opBGP;
}
// Reorder by Selectivity
ReorderFixed optimizer1 = (ReorderFixed) ReorderLib.fixed();
BasicPattern optimizedPattern1 = optimizer1.reorder(opBGP.getPattern());
// Reorder to avoid cross products and reduce the number of joins, if possible
ReorderNoCross optimizer2 = new ReorderNoCross();
BasicPattern optimizedPattern2 = optimizer2.reorder(optimizedPattern1);
OpBGP optimizedBGP = new OpBGP(optimizedPattern2);
return optimizedBGP;
/*
Heuristic variableCountingUnbound = new VariableCountingUnbound();
BasicPatternGraph graph = new BasicPatternGraph(opBGP.getPattern(), variableCountingUnbound);
BasicPattern optimizedPattern2 = graph.optimize();
OpBGP optimizedBGP2 = new OpBGP(optimizedPattern2);
return optimizedBGP2;
*/
}