org.apache.directory.server.core.partition.impl.btree
Class DefaultOptimizer

java.lang.Object
  org.apache.directory.server.core.partition.impl.btree.DefaultOptimizer

All Implemented Interfaces:

Optimizer

public class DefaultOptimizer

extends java.lang.Object

implements Optimizer

Optimizer that annotates the filter using scan counts.

Version:

$Rev: 442600 $

Author:

Apache Directory Project

Constructor Summary

DefaultOptimizer(BTreePartition db)
Creates an optimizer on a database.

Method Summary

void	annotate(ExprNode node) Annotates the expression tree to determine optimal evaluation order based on the scan count for indices that exist for each expression node.

Methods inherited from class java.lang.Object

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

Constructor Detail

DefaultOptimizer

public DefaultOptimizer(BTreePartition db)

Creates an optimizer on a database.

Parameters:

db - the database this optimizer works for.

Method Detail

annotate

public void annotate(ExprNode node)
              throws javax.naming.NamingException

Annotates the expression tree to determine optimal evaluation order based on the scan count for indices that exist for each expression node. If an index on the attribute does not exist an IndexNotFoundException will be thrown.

Specified by:

annotate in interface Optimizer

Parameters:

node - the root of the expression node tree

Throws:

javax.naming.NamingException - if there are failures while optimizing

See Also:

Optimizer.annotate(ExprNode)