org.datanucleus.query.compiler

Class VarThisCompilationOptimiser

java.lang.Object

org.datanucleus.query.compiler.VarThisCompilationOptimiser

All Implemented Interfaces:

CompilationOptimiser

public class VarThisCompilationOptimiser
extends Object
implements CompilationOptimiser

Optimiser for query compilation that searches for variable equality like "var == this". Since the variable is the same as the candidate it will replace all instances of the variable with the candidate. TODO We should only update "var == this" in the same branch of the filter (i.e not if used in other branches of the filter) Applies to the FILTER only.

Constructor Summary

Constructors

Constructor and Description
VarThisCompilationOptimiser(QueryCompilation compilation, MetaDataManager unused, ClassLoaderResolver clr)

Method Summary

Modifier and Type	Method and Description
void	optimise() Method to perform the optimisation.

Methods inherited from class java.lang.Object

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

Constructor Detail

VarThisCompilationOptimiser

public VarThisCompilationOptimiser(QueryCompilation compilation,
                                   MetaDataManager unused,
                                   ClassLoaderResolver clr)

Method Detail

optimise

public void optimise()

Description copied from interface: CompilationOptimiser

Method to perform the optimisation.

Specified by:

optimise in interface CompilationOptimiser