本文整理汇总了Java中com.hp.hpl.jena.sparql.algebra.optimize.TransformFilterDisjunction类的典型用法代码示例。如果您正苦于以下问题：Java TransformFilterDisjunction类的具体用法？Java TransformFilterDisjunction怎么用？Java TransformFilterDisjunction使用的例子？那么, 这里精选的类代码示例或许可以为您提供帮助。
TransformFilterDisjunction类属于com.hp.hpl.jena.sparql.algebra.optimize包，在下文中一共展示了TransformFilterDisjunction类的1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: optimizeAlgebra
import com.hp.hpl.jena.sparql.algebra.optimize.TransformFilterDisjunction; //导入依赖的package包/类
private Op optimizeAlgebra(Op opRoot) {
/*
* Algebra Optimierer fuehrt High-Level Transformationen aus (z.B. Filter Equalilty)
* -> nicht BGP reordering
*
* zunaechst muss gesetzt werden was alles optimiert werden soll, z.B.
* ARQ.set(ARQ.optFilterEquality, true);
* oder
* ARQ.set(ARQ.optFilterPlacement, true);
*
* Danach kann dann Algebra.optimize(op) aufgerufen werden
*/
/*
* Algebra.optimize always executes TransformJoinStrategy -> not always wanted
* ARQ.set(ARQ.optFilterPlacement, false);
* ARQ.set(ARQ.optFilterEquality, true);
* ARQ.set(ARQ.optFilterConjunction, true);
* ARQ.set(ARQ.optFilterDisjunction, true);
* opRoot = Algebra.optimize(opRoot);
*/
/*
* Reihenfolge der Optimierungen wichtig!
*
* 1. Transformationen der SPARQL-Algebra bis auf FilterPlacement -> koennte Kreuzprodukte erzeugen
* 2. BGPOptimizer -> Neuanordnung der Triple im BGP zur Vermeidung von Kreuzprodukten und zur Minimierung von Joins
* 3. FilterPlacement -> Vorziehen des Filters soweit moeglich
*/
// Perform Join optimization only if optimization level is set to ALL
if (Tags.optimizer == Optimizer.ALL) {
TransformJoinStrategy joinStrategy = new TransformJoinStrategy();
opRoot = Transformer.transform(joinStrategy, opRoot);
}
// Perform filter optimizations if optimization level is set to FILTER or ALL
if (Tags.optimizer == Optimizer.FILTER || Tags.optimizer == Optimizer.ALL) {
// ARQ optimization of Filter conjunction
TransformFilterConjunction filterConjunction = new TransformFilterConjunction();
opRoot = Transformer.transform(filterConjunction, opRoot);
// ARQ optimization of Filter disjunction
TransformFilterDisjunction filterDisjunction = new TransformFilterDisjunction();
opRoot = Transformer.transform(filterDisjunction, opRoot);
// ARQ optimization of Filter equality
TransformFilterEquality filterEquality = new TransformFilterEquality();
opRoot = Transformer.transform(filterEquality, opRoot);
// Own optimization of Filter variable equality
TransformFilterVarEquality filterVarEquality = new TransformFilterVarEquality();
opRoot = filterVarEquality.transform(opRoot);
}
// Perform BGP optimization if optimization level is set to BGP, FILTER or ALL
if (Tags.optimizer == Optimizer.BGP || Tags.optimizer == Optimizer.FILTER || Tags.optimizer == Optimizer.ALL) {
// Own BGP optimizer using variable counting heuristics
BGPOptimizerNoStats bgpOptimizer = new BGPOptimizerNoStats();
opRoot = bgpOptimizer.optimize(opRoot);
}
// Perform filter optimizations if optimization level is set to FILTER or ALL
// Filter Placement must be done last!
if (Tags.optimizer == Optimizer.FILTER || Tags.optimizer == Optimizer.ALL) {
// ARQ optimization of Filter placement
TransformFilterPlacement filterPlacement = new TransformFilterPlacement();
opRoot = Transformer.transform(filterPlacement, opRoot);
}
return opRoot;
}