com.massa.mrules.optimizer

Class MExpressionOptimizer

java.lang.Object

com.massa.mrules.optimizer.AbstractOptimizer

com.massa.mrules.optimizer.AbstractRecursiveOptimizer

com.massa.mrules.optimizer.MExpressionOptimizer

All Implemented Interfaces:

IMOptimizer

public class MExpressionOptimizer
extends AbstractRecursiveOptimizer

Optimizer which will check if logical operation might be simplified, without breaking flow control.
This optimizer has parameters :

• maxPass: tells the maximum number of optimization passes. Default is 3.

Since:

1.5.0

Constructor Summary

Constructors

Constructor and Description
MExpressionOptimizer()

Method Summary

Modifier and Type	Method and Description
protected IAddon	doAfterChildren(ICompilationContext ctxt, IAddon parent, PersistantPropertyInfo parentProp, IAddon addon) Performs optimization.
protected IAddon	doBeforeChildren(ICompilationContext ctxt, IAddon parent, PersistantPropertyInfo parentProp, IAddon addon) Does nothing.
int	getMaxPass()
protected void	pOptimize(ICompilationContext ctxt, IAddon addon) Optimizes an addon hierarchy by searching and simplifying logical expression.
void	setMaxPass(int maxPass)

Methods inherited from class com.massa.mrules.optimizer.AbstractRecursiveOptimizer

pOptimizeInCollection, pOptimizeInMap, pOptimizeRecursively

Methods inherited from class com.massa.mrules.optimizer.AbstractOptimizer

getActivationPropertyName, isActivated, optimize, setActivated

Methods inherited from class java.lang.Object

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

Constructor Detail

MExpressionOptimizer

public MExpressionOptimizer()

Method Detail

pOptimize

protected void pOptimize(ICompilationContext ctxt,
                         IAddon addon)
                  throws MRuleValidationException

Optimizes an addon hierarchy by searching and simplifying logical expression.
Searched patterns are:

• Condition sets with only one condition.
• //a = a
• a^a = 0
• a^/a = 1
• a^1 = /a
• a^0 = a
• a.a = a
• a./a = 0
• a.1 = a
• a.0 = 0
• a+a = a
• a+/a = 1
• a+1 = 1
• a+0 = a

Future versions will add new searched patterns, such as:

• a+/a.b = a+b
• a./b+/a.b = a^b
• ...

This method launches several times the recursive method, until no changes are made or maxPass is reached.

Overrides:

pOptimize in class AbstractRecursiveOptimizer

Parameters:

ctxt - Compilation context

addon - Addon to optimize

Throws:

MRuleValidationException

doBeforeChildren

protected IAddon doBeforeChildren(ICompilationContext ctxt,
                                  IAddon parent,
                                  PersistantPropertyInfo parentProp,
                                  IAddon addon)
                           throws MRuleValidationException

Does nothing.

Specified by:

doBeforeChildren in class AbstractRecursiveOptimizer

Returns:

A new addon instance if the addon should be replaced in the parent. Null if not.

Throws:

MRuleValidationException

doAfterChildren

protected IAddon doAfterChildren(ICompilationContext ctxt,
                                 IAddon parent,
                                 PersistantPropertyInfo parentProp,
                                 IAddon addon)
                          throws MRuleValidationException

Performs optimization.

Specified by:

doAfterChildren in class AbstractRecursiveOptimizer

Returns:

A new addon instance if the addon should be replaced in the parent. Null if not.

Throws:

MRuleValidationException

getMaxPass

public int getMaxPass()

setMaxPass

public void setMaxPass(int maxPass)