org.datanucleus.query.compiler

Class NavigationNullCompilationOptimiser

java.lang.Object

org.datanucleus.query.compiler.NavigationNullCompilationOptimiser

All Implemented Interfaces:

CompilationOptimiser

public class NavigationNullCompilationOptimiser
extends Object
implements CompilationOptimiser

Optimiser for query compilation that searches for navigation through relations, and adds "not null" checks. Applies to the FILTER only.

Constructor Summary

Constructors

Constructor and Description
NavigationNullCompilationOptimiser(QueryCompilation compilation, MetaDataManager mmgr, ClassLoaderResolver clr)

Method Summary

Modifier and Type	Method and Description
protected boolean	isPrimaryExpressionRelationNavigation(PrimaryExpression primExpr)
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

NavigationNullCompilationOptimiser

public NavigationNullCompilationOptimiser(QueryCompilation compilation,
                                          MetaDataManager mmgr,
                                          ClassLoaderResolver clr)

Method Detail

optimise

public void optimise()

Description copied from interface: CompilationOptimiser

Method to perform the optimisation.

Specified by:

optimise in interface CompilationOptimiser

isPrimaryExpressionRelationNavigation

protected boolean isPrimaryExpressionRelationNavigation(PrimaryExpression primExpr)