net.ontopia.topicmaps.query.impl.utils
Class QueryOptimizer.RecursivePruner

java.lang.Object
  net.ontopia.topicmaps.query.impl.utils.QueryOptimizer.AbstractQueryOptimizer
      net.ontopia.topicmaps.query.impl.utils.QueryOptimizer.RecursivePruner

All Implemented Interfaces:

QueryOptimizerIF

Enclosing class:

QueryOptimizer

public static class QueryOptimizer.RecursivePruner
extends QueryOptimizer.AbstractQueryOptimizer

This optimizer adds RemoveDuplicatesPredicate on both sides of recursive calls within predicate rules. Recursive rules tend to generate lots of redundant temporary results, which again generate more redundant junk. Removing duplicates cuts down the junk dramatically. This optimizer fixes bug #791.

Constructor Summary

QueryOptimizer.RecursivePruner()

Method Summary

java.util.List

optimize(java.util.List clauses, QueryContext context)

Methods inherited from class net.ontopia.topicmaps.query.impl.utils.QueryOptimizer.AbstractQueryOptimizer

optimize, optimize

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

QueryOptimizer.RecursivePruner

public QueryOptimizer.RecursivePruner()

Method Detail

optimize

public java.util.List optimize(java.util.List clauses,
                               QueryContext context)

Specified by:

optimize in interface QueryOptimizerIF

Overrides:

optimize in class QueryOptimizer.AbstractQueryOptimizer